Datum::getSRID() - Code Metrics - dvdoug/PHPCoord - Measure and Improve Code Quality continuously with Scrutinizer

Datum::getSRID() A
last analyzed 2025-01-31 22:38 UTC

↳ Parent: Datum
Complexity

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Total Lines	3
Code Lines	1
Duplication

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Ratio	0 %
Code Coverage

Tests	0
CRAP Score	2
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<?php

/**
 * PHPCoord.
 *
 * @author Doug Wright
 */
declare(strict_types=1);

namespace PHPCoord\Datum;

use DateTimeInterface;
use PHPCoord\Exception\UnknownDatumException;
use PHPCoord\UnitOfMeasure\Time\Year;

use function end;
use function array_map;
use function assert;

class Datum
{
    /**
     * AIOC 1995
     * Type: Vertical
     * Extent: Azerbaijan - Caspian offshore and onshore Sangachal terminal
     * Average level of Caspian Sea at the Oil Rocks tide gauge June-September 1995.
     * AIOC 1995 datum is 1.7m above Caspian datum and 26.3m below Baltic datum.
     */
    public const EPSG_AIOC_1995 = 'urn:ogc:def:datum:EPSG::5133';

    /**
     * AbInvA96_2020 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the A96 highway from Aberdeen to Inverness
     * Defined through the application of the AbInvA96_2000 NTv2 transformation (code 9386) to ETRS89 as realized
     * through OSNet v2009 CORS.
     * Created in 2020 to support intermediate CRS "AbInvA96_2020-IRF" in the emulation of the AbInvA96_2020 Snake map
     * projection.
     */
    public const EPSG_ABINVA96_2020_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1273';

    /**
     * Abidjan 1987
     * Type: Geodetic
     * Extent: Côte d'Ivoire (Ivory Coast)
     * Fundamental point: Abidjan I. Latitude: 5°18'51.01"N, longitude: 4°02'06.04"W (of Greenwich).
     */
    public const EPSG_ABIDJAN_1987 = 'urn:ogc:def:datum:EPSG::6143';

    /**
     * Accra
     * Type: Geodetic
     * Extent: Ghana
     * Fundamental point: GCS Station 547. Latitude: 5°23'43.3"N, longitude: 0°11'52.3"W (of Greenwich).
     * Replaced in 1978 by Leigon datum (code 6250).
     */
    public const EPSG_ACCRA = 'urn:ogc:def:datum:EPSG::6168';

    /**
     * Aden 1925
     * Type: Geodetic
     * Extent: Yemen - South Yemen onshore mainland.
     */
    public const EPSG_ADEN_1925 = 'urn:ogc:def:datum:EPSG::1135';

    /**
     * Adindan
     * Type: Geodetic
     * Extent: Eritrea; Ethiopia; South Sudan; Sudan
     * Fundamental point: Station 15; Adindan. Latitude: 22°10'07.110"N, longitude: 31°29'21.608"E (of Greenwich).
     * The 12th parallel traverse of 1966-70 (Point 58 datum, code 6620) is connected to the Blue Nile 1958 network in
     * western Sudan. This has given rise to misconceptions that the Blue Nile network is used in west Africa.
     */
    public const EPSG_ADINDAN = 'urn:ogc:def:datum:EPSG::6201';

    /**
     * Afgooye
     * Type: Geodetic
     * Extent: Somalia - onshore.
     */
    public const EPSG_AFGOOYE = 'urn:ogc:def:datum:EPSG::6205';

    /**
     * Agadez
     * Type: Geodetic
     * Extent: Niger.
     */
    public const EPSG_AGADEZ = 'urn:ogc:def:datum:EPSG::6206';

    /**
     * Ain el Abd 1970
     * Type: Geodetic
     * Extent: Bahrain, Kuwait and Saudi Arabia - onshore
     * Fundamental point: Ain El Abd.  Latitude: 28°14'06.171"N, longitude: 48°16'20.906"E (of Greenwich).
     */
    public const EPSG_AIN_EL_ABD_1970 = 'urn:ogc:def:datum:EPSG::6204';

    /**
     * Albanian 1987
     * Type: Geodetic
     * Extent: Albania - onshore.
     */
    public const EPSG_ALBANIAN_1987 = 'urn:ogc:def:datum:EPSG::6191';

    /**
     * Alboran
     * Type: Vertical
     * Extent: Spain - Alboran island - onshore
     * Mean Sea Level at Alboran harbour between 2017-01-01 and 2019-12-31.
     * Orthometric heights.
     */
    public const EPSG_ALBORAN = 'urn:ogc:def:datum:EPSG::1363';

    /**
     * Alicante
     * Type: Vertical
     * Extent: Gibraltar - onshore; Spain - mainland onshore
     * Mean Sea Level at Alicante between 1870 and 1872.
     * Orthometric heights.
     */
    public const EPSG_ALICANTE = 'urn:ogc:def:datum:EPSG::5180';

    /**
     * American Samoa 1962
     * Type: Geodetic
     * Extent: American Samoa - Tutuila, Aunu'u, Ofu, Olesega and Ta'u islands
     * Fundamental point: Betty 13 eccentric. Latitude: 14°20'08.34"S, longitude: 170°42'52.25"W (of Greenwich).
     */
    public const EPSG_AMERICAN_SAMOA_1962 = 'urn:ogc:def:datum:EPSG::6169';

    /**
     * American Samoa Vertical Datum of 2002
     * Type: Vertical
     * Extent: American Samoa - Tutuila island
     * Mean sea level at Pago Pago harbor, Tutuila. Benchmark 1770000 S TIDAL = 1.364m relative to National Tidal Datum
     * Epoch 1983-2001.
     * Replaces Tutuila vertical datum of 1962 (datum code 1121). Replaced by Pago Pago local tidal datum (datum code
     * 1302) in March 2020 after ASVD02 benchmarks destroyed by earthquake activity.
     */
    public const EPSG_AMERICAN_SAMOA_VERTICAL_DATUM_OF_2002 = 'urn:ogc:def:datum:EPSG::1125';

    /**
     * Amersfoort
     * Type: Geodetic
     * Extent: Netherlands - onshore, including Waddenzee, Dutch Wadden Islands and 12-mile offshore coastal zone
     * Originally defined through fundamental point Amersfoort, latitude 52°09'22.178"N, longitude 5°23'15.478"E (of
     * Greenwich). Since 2000-10-01 has been redefined as derived from ETRS89 by application of the official
     * transformation RDNAPTRANS(TM).
     */
    public const EPSG_AMERSFOORT = 'urn:ogc:def:datum:EPSG::6289';

    /**
     * Ammassalik 1958
     * Type: Geodetic
     * Extent: Greenland - Ammassalik area onshore.
     */
    public const EPSG_AMMASSALIK_1958 = 'urn:ogc:def:datum:EPSG::6196';

    /**
     * Ancienne Triangulation Francaise (Paris)
     * Type: Geodetic
     * Extent: France - mainland onshore
     * Uses the RGS value for the Paris meridian. In Alsace, data suspected to be transformation of German network into
     * ATF. Replaced by Nouvelle Triangulation Francaise (Paris) (code 6807) which uses the 1936 IGN value for the
     * Paris meridian.
     */
    public const EPSG_ANCIENNE_TRIANGULATION_FRANCAISE_PARIS = 'urn:ogc:def:datum:EPSG::6901';

    /**
     * Anguilla 1957
     * Type: Geodetic
     * Extent: Anguilla - onshore
     * Fundamental point: station A4, Police.
     */
    public const EPSG_ANGUILLA_1957 = 'urn:ogc:def:datum:EPSG::6600';

    /**
     * Antalya
     * Type: Vertical
     * Extent: Turkey - onshore
     * Mean sea Level at Antalya 1936-71.
     * Orthometric heights.
     */
    public const EPSG_ANTALYA = 'urn:ogc:def:datum:EPSG::5173';

    /**
     * Antigua 1943
     * Type: Geodetic
     * Extent: Antigua island - onshore
     * Fundamental point: station A14.
     */
    public const EPSG_ANTIGUA_1943 = 'urn:ogc:def:datum:EPSG::6601';

    /**
     * Aratu
     * Type: Geodetic
     * Extent: Brazil - offshore south and east of a line intersecting the coast at 2°55'S; onshore Tucano basin.
     */
    public const EPSG_ARATU = 'urn:ogc:def:datum:EPSG::6208';

    /**
     * Arc 1950
     * Type: Geodetic
     * Extent: Botswana; Malawi; Zambia; Zimbabwe
     * Fundamental point: Buffelsfontein. Latitude: 33°59'32.000"S, longitude: 25°30'44.622"E (of Greenwich).
     */
    public const EPSG_ARC_1950 = 'urn:ogc:def:datum:EPSG::6209';

    /**
     * Arc 1960
     * Type: Geodetic
     * Extent: Burundi, Kenya, Rwanda, Tanzania and Uganda
     * Fundamental point: Buffelsfontein. Latitude: 33°59'32.000"S, longitude: 25°30'44.622"E (of Greenwich).
     */
    public const EPSG_ARC_1960 = 'urn:ogc:def:datum:EPSG::6210';

    /**
     * Ascension Island 1958
     * Type: Geodetic
     * Extent: St Helena, Ascension and Tristan da Cunha - Ascension Island - onshore.
     */
    public const EPSG_ASCENSION_ISLAND_1958 = 'urn:ogc:def:datum:EPSG::6712';

    /**
     * Astro DOS 71
     * Type: Geodetic
     * Extent: St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore
     * Fundamental point: DOS 71/4, Ladder Hill Fort, latitude: 15°55'30"S, longitude: 5°43'25"W (of Greenwich).
     */
    public const EPSG_ASTRO_DOS_71 = 'urn:ogc:def:datum:EPSG::6710';

    /**
     * Auckland 1946
     * Type: Vertical
     * Extent: New Zealand - North Island - Auckland vertical CRS area
     * MSL at Auckland harbour 1909-1923.
     */
    public const EPSG_AUCKLAND_1946 = 'urn:ogc:def:datum:EPSG::5157';

    /**
     * Australian Antarctic Datum 1998
     * Type: Geodetic
     * Extent: Antarctica between 45°E and 136°E and between 142°E and 160°E - Australian sector.
     */
    public const EPSG_AUSTRALIAN_ANTARCTIC_DATUM_1998 = 'urn:ogc:def:datum:EPSG::6176';

    /**
     * Australian Geodetic Datum 1966
     * Type: Geodetic
     * Extent: Australia. Papua New Guinea - onshore
     * Fundamental point: Johnson Memorial Cairn. Latitude: 25°56'54.5515"S, longitude: 133°12'30.0771"E (of
     * Greenwich).
     */
    public const EPSG_AUSTRALIAN_GEODETIC_DATUM_1966 = 'urn:ogc:def:datum:EPSG::6202';

    /**
     * Australian Geodetic Datum 1984
     * Type: Geodetic
     * Extent: Australia - Queensland, South Australia, Western Australia, federal areas offshore west of 129°E
     * Fundamental point: Johnson Memorial Cairn. Latitude: 25°56'54.5515"S, longitude: 133°12'30.0771"E (of
     * Greenwich).
     * Uses all data from 1966 adjustment with additional observations, improved software and a geoid model.
     */
    public const EPSG_AUSTRALIAN_GEODETIC_DATUM_1984 = 'urn:ogc:def:datum:EPSG::6203';

    /**
     * Australian Height Datum
     * Type: Vertical
     * Extent: Australia - Australian Capital Territory, New South Wales, Northern Territory, Queensland, South
     * Australia, Tasmania, Western Australia and Victoria - onshore. Christmas Island - onshore. Cocos and Keeling
     * Islands - onshore
     * Mainland: MSL 1966-68 at 30 gauges around coast. Tasmania: MSL 1972 at Hobart and Burnie. Christmas Island: MSL
     * (details unspecified). Cocos and Keeling Islands: MSL (details unspecified).
     * Normal-orthometric heights. Initially defined for mainland only, with independent height datums for Australian
     * mainland, Tasmania, Christmas Island and Cocos and Keeling Islands. With introduction of AUSGeoid2020 in 2017,
     * all considered to be AHD.
     */
    public const EPSG_AUSTRALIAN_HEIGHT_DATUM = 'urn:ogc:def:datum:EPSG::5111';

    /**
     * Australian Height Datum (Tasmania)
     * Type: Vertical
     * Extent: Australia - Tasmania mainland - onshore
     * MSL 1972 at Hobart and Burnie.
     */
    public const EPSG_AUSTRALIAN_HEIGHT_DATUM_TASMANIA = 'urn:ogc:def:datum:EPSG::5112';

    /**
     * Australian Terrestrial Reference Frame 2014
     * Type: Dynamic geodetic
     * Extent: Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island,
     * Cocos (Keeling) Islands, Norfolk Island
     * ITRF2014 at epoch 2020.0.
     * Densification of ITRF2014 in the Australian region.
     */
    public const EPSG_AUSTRALIAN_TERRESTRIAL_REFERENCE_FRAME_2014 = 'urn:ogc:def:datum:EPSG::1291';

    /**
     * Australian Vertical Working Surface
     * Type: Vertical
     * Extent: Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island,
     * Cocos (Keeling) Islands, Norfolk Island
     * Realized by the Australian gravimetric quasi-geoid (AGQG).
     * Normal heights. Extends gravity-related heights to offshore. See AHD (datum code 5111) for cadastral survey or
     * local engineering survey including construction or mining.
     */
    public const EPSG_AUSTRALIAN_VERTICAL_WORKING_SURFACE = 'urn:ogc:def:datum:EPSG::1292';

    /**
     * Autonomous Regions of Portugal 2008
     * Type: Geodetic
     * Extent: Portugal - Azores and Madeira island groups and surrounding EEZ - Flores, Corvo; Graciosa, Terceira, Sao
     * Jorge, Pico, Faial; Sao Miguel, Santa Maria; Madeira, Porto Santo, Desertas; Selvagens
     * ITRF93 as derived from the 1994 TransAtlantic Network for Geodynamics and Oceanography (TANGO) project.
     * Replaces older classical datums for Azores and Madeira archipelagos.
     */
    public const EPSG_AUTONOMOUS_REGIONS_OF_PORTUGAL_2008 = 'urn:ogc:def:datum:EPSG::1041';

    /**
     * Average Terrestrial System 1977
     * Type: Geodetic
     * Extent: Canada - New Brunswick; Nova Scotia; Prince Edward Island
     * In use from 1979. To be phased out in late 1990's.
     */
    public const EPSG_AVERAGE_TERRESTRIAL_SYSTEM_1977 = 'urn:ogc:def:datum:EPSG::6122';

    /**
     * Ayabelle Lighthouse
     * Type: Geodetic
     * Extent: Djibouti
     * Fundamental point: Ayabelle Lighthouse.
     */
    public const EPSG_AYABELLE_LIGHTHOUSE = 'urn:ogc:def:datum:EPSG::6713';

    /**
     * Azores Central Islands 1948
     * Type: Geodetic
     * Extent: Portugal - central Azores onshore - Faial, Graciosa, Pico, Sao Jorge, Terceira
     * Fundamental point: Graciosa south west base. Latitude: 39°03'54.934"N, longitude: 28°02'23.882"W (of
     * Greenwich).
     * Replaced by 1995 adjustment (datum code 6665).
     */
    public const EPSG_AZORES_CENTRAL_ISLANDS_1948 = 'urn:ogc:def:datum:EPSG::6183';

    /**
     * Azores Central Islands 1995
     * Type: Geodetic
     * Extent: Portugal - central Azores onshore - Faial, Graciosa, Pico, Sao Jorge, Terceira
     * Fundamental point: Graciosa south west base. Origin and orientation constrained to those of the 1948 adjustment.
     * Classical and GPS observations. Replaces 1948 adjustment (datum code 6183).
     */
    public const EPSG_AZORES_CENTRAL_ISLANDS_1995 = 'urn:ogc:def:datum:EPSG::6665';

    /**
     * Azores Occidental Islands 1939
     * Type: Geodetic
     * Extent: Portugal - western Azores onshore - Flores, Corvo
     * Fundamental point: Observatario Meteorologico Flores.
     */
    public const EPSG_AZORES_OCCIDENTAL_ISLANDS_1939 = 'urn:ogc:def:datum:EPSG::6182';

    /**
     * Azores Oriental Islands 1940
     * Type: Geodetic
     * Extent: Portugal - eastern Azores onshore - Sao Miguel, Santa Maria, Formigas
     * Fundamental point: Forte de São Bras.
     * Replaced by 1995 adjustment (datum code 6664).
     */
    public const EPSG_AZORES_ORIENTAL_ISLANDS_1940 = 'urn:ogc:def:datum:EPSG::6184';

    /**
     * Azores Oriental Islands 1995
     * Type: Geodetic
     * Extent: Portugal - eastern Azores onshore - Sao Miguel, Santa Maria, Formigas
     * Fundamental point: Forte de São Bras. Origin and orientation constrained to those of the 1940 adjustment.
     * Classical and GPS observations. Replaces 1940 adjustment (datum code 6184).
     */
    public const EPSG_AZORES_ORIENTAL_ISLANDS_1995 = 'urn:ogc:def:datum:EPSG::6664';

    /**
     * BH_ETRS89
     * Type: Geodetic
     * Extent: Bosnia and Herzegovina
     * Densification of ETRF2000 in Bosnia and Herzegovina at epoch 2011.307.
     * ETRS89 in Bosnia and Herzegovina, realized through the coordinates of 17 stations of the GNSS active FBiHPOS
     * network in conjunction with 17 stations of the Serbia SRPOS network.
     */
    public const EPSG_BH_ETRS89 = 'urn:ogc:def:datum:EPSG::1358';

    /**
     * Baltic 1957
     * Type: Vertical
     * Extent: Czechia; Slovakia
     * Datum: average water level at Kronstadt 1833. Network adjusted in 1957 as Uniform Precise Leveling Network of
     * Eastern Europe (EPNN).
     * Uses Normal heights.
     */
    public const EPSG_BALTIC_1957 = 'urn:ogc:def:datum:EPSG::1202';

    /**
     * Baltic 1977
     * Type: Vertical
     * Extent: Armenia; Azerbaijan; Belarus; Estonia - onshore; Georgia - onshore; Kazakhstan; Kyrgyzstan; Latvia -
     * onshore; Lithuania - onshore; Moldova; Russia - onshore; Tajikistan; Turkmenistan; Ukraine - onshore; Uzbekistan
     * Datum: average water level at Kronstadt 1833. Network adjusted in 1974-78 as Uniform Precise Leveling Network of
     * Eastern Europe (EPNN).
     * Uses Normal heights. Adjustment also included former Czechoslovakia but was not adopted there, the 1957
     * adjustment being retained instead.
     */
    public const EPSG_BALTIC_1977 = 'urn:ogc:def:datum:EPSG::5105';

    /**
     * Baltic 1980
     * Type: Vertical
     * Extent: Hungary
     * Uses Normal heights.
     */
    public const EPSG_BALTIC_1980 = 'urn:ogc:def:datum:EPSG::5185';

    /**
     * Baltic 1982
     * Type: Vertical
     * Extent: Bulgaria - onshore
     * Network adjusted in 1982. Height at reference point Varna defined as 1958 value from the UPLN adjustment. Datum
     * at Kronstadt is mean sea level of Baltic in 1833.
     * Uses Normal heights.
     */
    public const EPSG_BALTIC_1982 = 'urn:ogc:def:datum:EPSG::5184';

    /**
     * Baltic 1986
     * Type: Vertical
     * Extent: Poland - onshore
     * Mean sea level of Baltic at Kronstadt in 1833. Network adjusted in 1982.
     *
     * Uses Normal heights. Adopted in 1986.
     */
    public const EPSG_BALTIC_1986 = 'urn:ogc:def:datum:EPSG::1296';

    /**
     * Baltic Sea Chart Datum 2000
     * Type: Vertical
     * Extent: Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Norway, Poland, Russia and Sweden - offshore
     * Baltic Sea including Skagerrak east of 8°30'E, Kattegat, Gulf of Bothnia, and Gulf of Finland
     * Equipotential surface of the Earth’s gravity field based on the definitions for EVRS and ETRS89 with reference
     * epoch 2000.0 for the postglacial land uplift in Fennoscandia. Zero level is Normaal Amsterdams Peil (NAP).
     * Defined by the BSCD2000 model.
     * Realized at the national level through coordinates at reference epoch 2000.0 using existing national geodetic
     * infrastructure (see BSCD2000 Specifications document).
     */
    public const EPSG_BALTIC_SEA_CHART_DATUM_2000 = 'urn:ogc:def:datum:EPSG::1390';

    /**
     * Bandar Abbas
     * Type: Vertical
     * Extent: Iran - onshore
     * Average sea level at Bandar Abbas 1995-2001.
     * Replaces Fao (datum code 5149) in Iran.
     */
    public const EPSG_BANDAR_ABBAS = 'urn:ogc:def:datum:EPSG::5150';

    /**
     * Barbados 1938
     * Type: Geodetic
     * Extent: Barbados - onshore
     * Fundamental point: HMS Challenger astro station M1, St. Anne's Tower. Latitude 13°04'32.53"N, longitude
     * 59°36'29.34"W (of Greenwich).
     */
    public const EPSG_BARBADOS_1938 = 'urn:ogc:def:datum:EPSG::6212';

    /**
     * Batavia
     * Type: Geodetic
     * Extent: Indonesia - Bali, Java and western Sumatra onshore, offshore southern Java Sea, Madura Strait and
     * western Bali Sea
     * Fundamental point: Longitude at Batavia Astro. Station. Latitude: 6°07'39.522"S, longitude: 106°48'27.790"E
     * (of Greenwich). Latitude and azimuth at Genuk.
     */
    public const EPSG_BATAVIA = 'urn:ogc:def:datum:EPSG::6211';

    /**
     * Batavia (Jakarta)
     * Type: Geodetic
     * Extent: Indonesia - onshore - Bali, Java and western Sumatra
     * Fundamental point: Longitude at Batavia astronomical station. Latitude: 6°07'39.522"S, longitude: 0°00'00.0"E
     * (of Jakarta). Latitude and azimuth at Genuk.
     */
    public const EPSG_BATAVIA_JAKARTA = 'urn:ogc:def:datum:EPSG::6813';

    /**
     * Beduaram
     * Type: Geodetic
     * Extent: Niger - southeast.
     */
    public const EPSG_BEDUARAM = 'urn:ogc:def:datum:EPSG::6213';

    /**
     * Beijing 1954
     * Type: Geodetic
     * Extent: China
     * Pulkovo, transferred through Russian triangulation.
     * Scale determined through three baselines in northeast China. Discontinuities at boundaries of adjustment blocks.
     * From 1982 replaced by Xian 1980 and New Beijing.
     */
    public const EPSG_BEIJING_1954 = 'urn:ogc:def:datum:EPSG::6214';

    /**
     * Bekaa Valley 1920
     * Type: Geodetic
     * Extent: Lebanon - onshore.
     */
    public const EPSG_BEKAA_VALLEY_1920 = 'urn:ogc:def:datum:EPSG::1137';

    /**
     * Belfast Lough
     * Type: Vertical
     * Extent: UK - Northern Ireland (Ulster) - onshore
     * Mean sea level between 1951 and 1956 at Clarendon Dock, Belfast. Initially realised through levelling network
     * adjustment, from 2002 redefined to be realised through OSGM geoid model.
     * Orthometric heights. Malin Head (datum code 5130) used for 1:50,000 and smaller mapping.
     */
    public const EPSG_BELFAST_LOUGH = 'urn:ogc:def:datum:EPSG::5131';

    /**
     * Bellevue
     * Type: Geodetic
     * Extent: Vanuatu - southern islands - Aneityum, Efate, Erromango and Tanna
     * Datum covers all the major islands of Vanuatu in two different adjustment blocks, but practical usage is as
     * given in the area of use.
     */
    public const EPSG_BELLEVUE = 'urn:ogc:def:datum:EPSG::6714';

    /**
     * Bermuda 1957
     * Type: Geodetic
     * Extent: Bermuda - onshore
     * Fundamental point: Fort George base. Latitude 32°22'44.36"N, longitude 64°40'58.11"W (of Greenwich).
     */
    public const EPSG_BERMUDA_1957 = 'urn:ogc:def:datum:EPSG::6216';

    /**
     * Bermuda 2000
     * Type: Geodetic
     * Extent: Bermuda
     * ITRF96 at epoch 2000.0.
     */
    public const EPSG_BERMUDA_2000 = 'urn:ogc:def:datum:EPSG::6762';

    /**
     * Bern 1938
     * Type: Geodetic
     * Extent: Liechtenstein; Switzerland
     * Fundamental point: Old Bern observatory. Latitude: 46°57'07.890"N, longitude: 7°26'22.335"E (of Greenwich).
     * This redetermination of the coordinates of fundamental point is used for scientific purposes and as the
     * graticule overprinted on topographic maps constructed on the CH1903 / LV03 projected CS (code 21781).
     */
    public const EPSG_BERN_1938 = 'urn:ogc:def:datum:EPSG::6306';

    /**
     * Bhutan National Geodetic Datum
     * Type: Geodetic
     * Extent: Bhutan
     * ITRF2000 at epoch 2003.87.
     */
    public const EPSG_BHUTAN_NATIONAL_GEODETIC_DATUM = 'urn:ogc:def:datum:EPSG::1058';

    /**
     * Bioko
     * Type: Geodetic
     * Extent: Equatorial Guinea - Bioko onshore.
     */
    public const EPSG_BIOKO = 'urn:ogc:def:datum:EPSG::1136';

    /**
     * Bissau
     * Type: Geodetic
     * Extent: Guinea-Bissau - onshore.
     */
    public const EPSG_BISSAU = 'urn:ogc:def:datum:EPSG::6165';

    /**
     * Black Sea
     * Type: Vertical
     * Extent: Georgia
     * Black Sea datum is 0.4m below Baltic datum.
     */
    public const EPSG_BLACK_SEA = 'urn:ogc:def:datum:EPSG::5134';

    /**
     * Bluff 1955
     * Type: Vertical
     * Extent: New Zealand - South Island - Bluff vertical CRS area
     * MSL at Invercargill harbour over 8 years between 1918 and 1934.
     */
    public const EPSG_BLUFF_1955 = 'urn:ogc:def:datum:EPSG::5158';

    /**
     * Bogota 1975
     * Type: Geodetic
     * Extent: Colombia - mainland and offshore Caribbean
     * Fundamental point: Bogota observatory. Latitude: 4°35'56.570"N, longitude: 74°04'51.300"W (of Greenwich).
     * Replaces 1951 adjustment. Replaced by MAGNA-SIRGAS (datum code 6685).
     */
    public const EPSG_BOGOTA_1975 = 'urn:ogc:def:datum:EPSG::6218';

    /**
     * Bogota 1975 (Bogota)
     * Type: Geodetic
     * Extent: Colombia - mainland onshore
     * Fundamental point: Bogota observatory. Latitude: 4°35'56.570"N, longitude: 0°E (of Bogota).
     */
    public const EPSG_BOGOTA_1975_BOGOTA = 'urn:ogc:def:datum:EPSG::6802';

    /**
     * Bora Bora SAU 2001
     * Type: Vertical
     * Extent: French Polynesia - Society Islands - Bora Bora
     * Fundamental benchmark: Vaitape quay SHOM benchmark B.
     * Included as part of NGPF - see datum code 5195.
     */
    public const EPSG_BORA_BORA_SAU_2001 = 'urn:ogc:def:datum:EPSG::5202';

    /**
     * Brenner Base Tunnel 2000
     * Type: Geodetic
     * Extent: Austria and Italy - on or related to the Brenner Base Tunnel rail route from Innsbruck to Fortezza
     * (Franzensfeste)
     * Realized through a network of stations aligned to [email protected].
     * Network of BBT stations, including existing nearby stations of the Austrian AREF-TIREF network, the Italian
     * IGM95 network and the Trentino Alto Adige provincial cadastral control network.
     */
    public const EPSG_BRENNER_BASE_TUNNEL_2000 = 'urn:ogc:def:datum:EPSG::1367';

    /**
     * British Isles height ensemble
     * Type: Ensemble
     * Extent: UK - offshore to boundary of UKCS within 49°45'N to 61°N and 9°W to 2°E; onshore Great Britain
     * (England, Wales and Scotland) and Northern Ireland. Ireland onshore. Isle of Man onshore
     * Ensemble of 9 independent vertical datums now all defined through OS geoid model OSGM15.
     * Orthometric heights.
     */
    public const EPSG_BRITISH_ISLES_HEIGHT_ENSEMBLE = 'urn:ogc:def:datum:EPSG::1288';

    /**
     * Bukit Rimpah
     * Type: Geodetic
     * Extent: Indonesia - Banga and Belitung Islands
     * 2°00'40.16"S, 105°51'39.76"E (of Greenwich).
     */
    public const EPSG_BUKIT_RIMPAH = 'urn:ogc:def:datum:EPSG::6219';

    /**
     * Bulgaria Geodetic System 2005
     * Type: Geodetic
     * Extent: Bulgaria
     * Densification of ETRS89 realised through network of 112 permanent GNSS reference stations in [email protected].
     * Adopted as official Bulgarian reference datum through decree 153 of 2010-07-29.
     */
    public const EPSG_BULGARIA_GEODETIC_SYSTEM_2005 = 'urn:ogc:def:datum:EPSG::1167';

    /**
     * Bulgarian Height System 2005
     * Type: Vertical
     * Extent: Bulgaria - onshore
     * Bulgarian realisation of EVRF2007. EVRF2007 heights of 58 points in Bulgaria held fixed.
     * Uses Normal heights. Adopted as official Bulgarian height reference datum through decree 153 of 2010-07-29.
     */
    public const EPSG_BULGARIAN_HEIGHT_SYSTEM_2005 = 'urn:ogc:def:datum:EPSG::1300';

    /**
     * CH1903
     * Type: Geodetic
     * Extent: Liechtenstein; Switzerland
     * Fundamental point: Old Bern observatory. Latitude: 46°57'08.660"N, longitude: 7°26'22.500"E (of Greenwich).
     */
    public const EPSG_CH1903 = 'urn:ogc:def:datum:EPSG::6149';

    /**
     * CH1903 (Bern)
     * Type: Geodetic
     * Extent: Liechtenstein; Switzerland
     * Fundamental point: Old Bern observatory. Latitude: 46°57'08.660"N, longitude: 0°E (of Bern).
     */
    public const EPSG_CH1903_BERN = 'urn:ogc:def:datum:EPSG::6801';

    /**
     * CH1903+
     * Type: Geodetic
     * Extent: Liechtenstein; Switzerland
     * Fundamental point: Zimmerwald observatory.
     */
    public const EPSG_CH1903_PLUS = 'urn:ogc:def:datum:EPSG::6150';

    /**
     * CNH22 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Crewe via Chester to Holyhead
     * Defined through the application of the CNH22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
     * Created in 2022 to support intermediate CRS CNH22-IRF in the emulation of the CNH22 Snake map projection.
     */
    public const EPSG_CNH22_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1336';

    /**
     * COV23 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - in and around the area of Coventry city centre and the route to Birmingham airport
     * Defined through the application of the COV23 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
     * Created in 2023 to support intermediate CRS COV23-IRF in the emulation of the COV23 Snake map projection.
     */
    public const EPSG_COV23_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1366';

    /**
     * CR-SIRGAS
     * Type: Geodetic
     * Extent: Costa Rica
     * ITRF2008 (IGb08) at epoch 2014.59. Network of 42 GNSS stations of the passive and active reference system.
     * Replaces CR05 from April 2018.
     */
    public const EPSG_CR_SIRGAS = 'urn:ogc:def:datum:EPSG::1225';

    /**
     * CWS13 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from from Chester via Wrexham to Shrewsbury
     * Defined through the application of the CWS13 NTv2 transformation (code 10197) to ETRS89 as realized through
     * OSNet v2009 CORS.
     * Created in 2022 to support intermediate CRS CWS13-IRF in the emulation of the CWS13 Snake map projection.
     */
    public const EPSG_CWS13_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1338';

    /**
     * Cadastre 1997
     * Type: Geodetic
     * Extent: Mayotte - onshore
     * Coordinates of 1 station of Combani 1950 adjustment held fixed.
     * Derived by adjustment of GPS-observed network which was constrained to Combani 1950 coordinates of one station.
     */
    public const EPSG_CADASTRE_1997 = 'urn:ogc:def:datum:EPSG::1037';

    /**
     * Cagliari 1956
     * Type: Vertical
     * Extent: Italy - Sardinia onshore
     * Mean Sea Level at Cagliari 1955-1957.
     * Orthometric heights.
     */
    public const EPSG_CAGLIARI_1956 = 'urn:ogc:def:datum:EPSG::1307';

    /**
     * Cais da Figueirinha
     * Type: Vertical
     * Extent: Portugal - central Azores - Terceira island onshore
     * Mean Sea Level during 1951 at Cais da Figueirinha, Angra do Heroísmo.
     * Orthometric heights.
     */
    public const EPSG_CAIS_DA_FIGUEIRINHA = 'urn:ogc:def:datum:EPSG::1107';

    /**
     * Cais da Madalena
     * Type: Vertical
     * Extent: Portugal - central Azores - Pico island onshore
     * Mean Sea Level during 1937 at Cais da Madalena.
     * Orthometric heights.
     */
    public const EPSG_CAIS_DA_MADALENA = 'urn:ogc:def:datum:EPSG::1105';

    /**
     * Cais da Pontinha
     * Type: Vertical
     * Extent: Portugal - Madeira and Desertas islands - onshore
     * Mean Sea Level during 1913 at Cais da Pontinha, Funchal.
     * Orthometric heights.
     */
    public const EPSG_CAIS_DA_PONTINHA = 'urn:ogc:def:datum:EPSG::1101';

    /**
     * Cais da Vila
     * Type: Vertical
     * Extent: Portugal - Porto Santo island (Madeira archipelago) onshore
     * Mean Sea Level during 1936 at Cais da Vila, Porto Santo.
     * Orthometric heights.
     */
    public const EPSG_CAIS_DA_VILA = 'urn:ogc:def:datum:EPSG::1102';

    /**
     * Cais da Vila do Porto
     * Type: Vertical
     * Extent: Portugal - eastern Azores onshore - Santa Maria, Formigas
     * Mean Sea Level during 1965 at Cais da Vila, Porto.
     * Orthometric heights.
     */
    public const EPSG_CAIS_DA_VILA_DO_PORTO = 'urn:ogc:def:datum:EPSG::1109';

    /**
     * Cais das Velas
     * Type: Vertical
     * Extent: Portugal - central Azores - Sao Jorge island onshore
     * Mean Sea Level during 1937 at Cais das Velas.
     * Orthometric heights.
     */
    public const EPSG_CAIS_DAS_VELAS = 'urn:ogc:def:datum:EPSG::1103';

    /**
     * Camacupa 1948
     * Type: Geodetic
     * Extent: Angola - Angola proper
     * Fundamental point: Campo de Aviaçao. Latitude: 12°01'09.070"S, Longitude = 17°27'19.800"E (of Greenwich).
     * Provisional adjustment, replaced in 2015 for onshore use by Camacupa 2015.
     */
    public const EPSG_CAMACUPA_1948 = 'urn:ogc:def:datum:EPSG::6220';

    /**
     * Camacupa 2015
     * Type: Geodetic
     * Extent: Angola
     * Fundamental point: Campo de Aviaçao. Latitude: 12°01'08.702"S, Longitude = 17°27'19.515"E (of Greenwich).
     * Second adjustment. Not used for offshore oil and gas exploration and production.
     */
    public const EPSG_CAMACUPA_2015 = 'urn:ogc:def:datum:EPSG::1217';

    /**
     * Camp Area Astro
     * Type: Geodetic
     * Extent: Antarctica - McMurdo Sound, Camp McMurdo area.
     */
    public const EPSG_CAMP_AREA_ASTRO = 'urn:ogc:def:datum:EPSG::6715';

    /**
     * Campo Inchauspe
     * Type: Geodetic
     * Extent: Argentina - mainland onshore and Atlantic offshore Tierra del Fuego
     * Fundamental point: Campo Inchauspe. Latitude: 35°58'16.56"S, longitude: 62°10'12.03"W (of Greenwich).
     */
    public const EPSG_CAMPO_INCHAUSPE = 'urn:ogc:def:datum:EPSG::6221';

    /**
     * Canadian Geodetic Vertical Datum of 1928
     * Type: Vertical
     * Extent: Canada - onshore - Alberta; British Columbia; Manitoba south of 59°N; New Brunswick; Newfoundland,
     * Labrador between 52°50’N and 54°30’N; Northwest Territories south west of a line between 60°40’N,
     * 110°W and the coast at 132°W; Nova Scotia; Ontario south of 52°20'N; Prince Edward Island; Quebec - mainland
     * south of 55°N and west of 64°W, north of 55°N between 70°W and 66°W, coastal area between 66°W and 64°W,
     * and Anticosta island; Saskatchewan south of 58°30’N; Yukon
     * Based on the mean sea level determined from several tidal gauges located in strategic areas of the country.
     * Supplemented by CGVD28(HTv2.0) (datum code 1384) outside area where levelling network exists. From November 2013
     * replaced by CGVD2013 (datum code 1127).
     */
    public const EPSG_CANADIAN_GEODETIC_VERTICAL_DATUM_OF_1928 = 'urn:ogc:def:datum:EPSG::5114';

    /**
     * Canadian Geodetic Vertical Datum of 1928 (Height Transformation version 2.0)
     * Type: Vertical
     * Extent: Canada between 41°N and 84°N and west of 48°W - Alberta; British Columbia; Manitoba; New Brunswick;
     * Newfoundland and Labrador; Northwest Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec;
     * Saskatchewan; Yukon
     * Derived from CGG2000 gravimetric geoid fitted to 1926 benchmarks with CGVD28 levellng-based heights and
     * NAD83(CSRS)v3 ellipsoid heights at epoch 1997.00. Defined by the hybrid geoid model HTv2.0 (Height
     * Transformation version 2.0).
     * Orthometric heights. Defines CGVD28 where the CGVD28 levelling-based network (datum code 5114) does not exist.
     * Defines CGVD28(HTv2.0) throughout the HTv2.0 coverage. Both CGVD28 and CGVD28(HTv2.0) replaced by CGVD2013
     * (datum code 1127).
     */
    public const EPSG_CANADIAN_GEODETIC_VERTICAL_DATUM_OF_1928_HEIGHT_TRANSFORMATION_VERSION_2_0 = 'urn:ogc:def:datum:EPSG::1384';

    /**
     * Canadian Geodetic Vertical Datum of 2013 (CGG2013)
     * Type: Vertical
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined by the equipotential surface W0 = 62,636,856.0 m^2s^-2, which by convention represents the coastal mean
     * sea level for North America, realized through the Canadian gravimetric geoid (CGG) 2013 at epoch 2010.0.
     * Replaces CGVD28 from November 2013. Replaced by CGVD2013(CGG2013a) epoch 2010 from December 2015, supplemented
     * from February 2021 by snapshots of CGVD2013(CGG2013a) at epochs 1997.0 and 2002.0 (aligned with NAD83(CSRS)
     * realization epochs).
     */
    public const EPSG_CANADIAN_GEODETIC_VERTICAL_DATUM_OF_2013_CGG2013 = 'urn:ogc:def:datum:EPSG::1127';

    /**
     * Canadian Geodetic Vertical Datum of 2013 (CGG2013a) epoch 1997
     * Type: Vertical
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined by the equipotential surface W0 = 62,636,856.0 m^2s^-2, which by convention represents the coastal mean
     * sea level for North America, realized through the Canadian gravimetric geoid 2013a applied at epoch 1997.0.
     * CGVD2013(CGG2013a) is a static datum; however, heights referenced to it change with time, primarily due to
     * glacial isostasy. This datum supports CGVD2013(CGG2013a) heights at epoch 1997.0. Other snapshots are at epochs
     * 2002.0 and 2010.0.
     */
    public const EPSG_CANADIAN_GEODETIC_VERTICAL_DATUM_OF_2013_CGG2013A_EPOCH_1997 = 'urn:ogc:def:datum:EPSG::1326';

    /**
     * Canadian Geodetic Vertical Datum of 2013 (CGG2013a) epoch 2002
     * Type: Vertical
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined by the equipotential surface W0 = 62,636,856.0 m^2s^-2, which by convention represents the coastal mean
     * sea level for North America, realized through the Canadian gravimetric geoid 2013a applied at epoch 2002.
     * CGVD2013(CGG2013a) is a static datum; however, heights referenced to it change with time, primarily due to
     * glacial isostasy. This datum supports CGVD2013(CGG2013a) heights at epoch 2002.0. Other snapshots are at epochs
     * 1997.0 and 2010.0.
     */
    public const EPSG_CANADIAN_GEODETIC_VERTICAL_DATUM_OF_2013_CGG2013A_EPOCH_2002 = 'urn:ogc:def:datum:EPSG::1325';

    /**
     * Canadian Geodetic Vertical Datum of 2013 (CGG2013a) epoch 2010
     * Type: Vertical
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined by the equipotential surface W0 = 62,636,856.0 m^2s^-2, which by convention represents the coastal mean
     * sea level for North America, realized through CGG2013a at epoch 2010.0. Geoid velocity defined as zero with
     * respect to NAD83(CSRS).
     * Replaces CGVD2013(CGG2013). CGVD2013(CGG2013a) is a static datum. However heights referenced to it change with
     * time, primarily due to glacial isostasy. In practice static snapshots are used at epochs 2010.0 (this datum),
     * 2002.0 and 1997.0.
     */
    public const EPSG_CANADIAN_GEODETIC_VERTICAL_DATUM_OF_2013_CGG2013A_EPOCH_2010 = 'urn:ogc:def:datum:EPSG::1256';

    /**
     * Cape
     * Type: Geodetic
     * Extent: Botswana; Eswatini (Swaziland); Lesotho; South Africa - mainland
     * Fundamental point: Buffelsfontein. Latitude: 33°59'32.000"S, longitude: 25°30'44.622"E (of Greenwich).
     */
    public const EPSG_CAPE = 'urn:ogc:def:datum:EPSG::6222';

    /**
     * Cape Canaveral
     * Type: Geodetic
     * Extent: North America - onshore - Bahamas and USA - Florida (east)
     * Fundamental point: Central 1950.  Latitude: 28°29'32.36555"N, longitude 80°34'38.77362"W (of Greenwich).
     */
    public const EPSG_CAPE_CANAVERAL = 'urn:ogc:def:datum:EPSG::6717';

    /**
     * Carthage
     * Type: Geodetic
     * Extent: Tunisia
     * Fundamental point: Carthage. Latitude: 40.9464506g = 36°51'06.50"N, longitude: 8.8724368g E of Paris =
     * 10°19'20.72"E (of Greenwich).
     * Fundamental point astronomic coordinates determined in 1878.
     */
    public const EPSG_CARTHAGE = 'urn:ogc:def:datum:EPSG::6223';

    /**
     * Carthage (Paris)
     * Type: Geodetic
     * Extent: Tunisia - onshore
     * Fundamental point: Carthage. Latitude: 40.9464506g N, longitude: 8.8724368g E (of Paris).
     * Fundamental point astronomic coordinates determined in 1878.
     */
    public const EPSG_CARTHAGE_PARIS = 'urn:ogc:def:datum:EPSG::6816';

    /**
     * Cascais
     * Type: Vertical
     * Extent: Portugal - mainland - onshore
     * Mean Sea Level at Cascais 1938.
     * Orthometric heights.
     */
    public const EPSG_CASCAIS = 'urn:ogc:def:datum:EPSG::5178';

    /**
     * Caspian Sea
     * Type: Vertical
     * Extent: Azerbaijan - offshore; Kazakhstan - offshore; Russia - Caspian Sea; Turkmenistan - offshore
     * Defined as -28.0m Baltic datum.
     */
    public const EPSG_CASPIAN_SEA = 'urn:ogc:def:datum:EPSG::5106';

    /**
     * Catania 1965
     * Type: Vertical
     * Extent: Italy - Sicily onshore
     * Mean Sea Level at Catania in 1965.
     * Orthometric heights.
     */
    public const EPSG_CATANIA_1965 = 'urn:ogc:def:datum:EPSG::1306';

    /**
     * Cayman Brac Vertical Datum 1961
     * Type: Vertical
     * Extent: Cayman Islands - Cayman Brac.
     */
    public const EPSG_CAYMAN_BRAC_VERTICAL_DATUM_1961 = 'urn:ogc:def:datum:EPSG::1099';

    /**
     * Cayman Islands Geodetic Datum 2011
     * Type: Geodetic
     * Extent: Cayman Islands. Includes Grand Cayman, Little Cayman and Cayman Brac
     * ITRF2005 at epoch 2011.0
     * Replaces GCGD59 (datum code 6723) and SIGD61 (datum code 6726).
     */
    public const EPSG_CAYMAN_ISLANDS_GEODETIC_DATUM_2011 = 'urn:ogc:def:datum:EPSG::1100';

    /**
     * Centre Spatial Guyanais 1967
     * Type: Geodetic
     * Extent: French Guiana - coastal area
     * Fundamental point: Kourou-Diane. Latitude: 5°15'53.699"N, longitude: 52°48'09.149"W (of Greenwich).
     * Replaced by RGFG95 (code 6624).
     */
    public const EPSG_CENTRE_SPATIAL_GUYANAIS_1967 = 'urn:ogc:def:datum:EPSG::6623';

    /**
     * Ceuta 2
     * Type: Vertical
     * Extent: Spain - Ceuta onshore
     * Mean Sea Level at Ceuta harbour between March 1944 and December 2006.
     * Orthometric heights. Replaces an earlier vertical datum in Ceuta harbour measured between 1908 and 1927.
     */
    public const EPSG_CEUTA_2 = 'urn:ogc:def:datum:EPSG::1285';

    /**
     * Chart Datum Portugal
     * Type: Vertical
     * Extent: Portugal - offshore
     * ZH is located below the level of the Lowest Astronomical Tide (LAT).
     * .
     */
    public const EPSG_CHART_DATUM_PORTUGAL = 'urn:ogc:def:datum:EPSG::1361';

    /**
     * Chart Datum UK & Ireland VORF08
     * Type: Vertical
     * Extent: Ireland and UK (including Isle of Man and Channel Islands) - inshore, nearshore and offshore
     * CD UK & Ireland VORF08 is defined by the Vertical Offshore Reference Frame v2.11 2008.
     * By international agreement, Chart Datum is defined as a level so low that the tide will not frequently fall
     * below it. In the United Kingdom and Ireland, this level is normally the level of approximate Lowest Astronomical
     * Tide.
     */
    public const EPSG_CHART_DATUM_UK_AND_IRELAND_VORF08 = 'urn:ogc:def:datum:EPSG::1331';

    /**
     * Chatham Islands Datum 1971
     * Type: Geodetic
     * Extent: New Zealand - Chatham Islands group - onshore
     * Replaced by Chatham Islands Datum 1979 (code 6673).
     */
    public const EPSG_CHATHAM_ISLANDS_DATUM_1971 = 'urn:ogc:def:datum:EPSG::6672';

    /**
     * Chatham Islands Datum 1979
     * Type: Geodetic
     * Extent: New Zealand - Chatham Islands group - onshore
     * Fundamental point: station Astro. Latitude: 43°57'23.60"S, longitude: 176°34'28.65"W (of Greenwich).
     * Replaces Chatham Islands Datum 1971 (code 6672). Replaced by New Zealand Geodetic Datum 2000 (code 6167) from
     * March 2000.
     */
    public const EPSG_CHATHAM_ISLANDS_DATUM_1979 = 'urn:ogc:def:datum:EPSG::6673';

    /**
     * China 2000
     * Type: Geodetic
     * Extent: China
     * ITRF97 at epoch 2000.0
     * Combined adjustment of astro-geodetic observations as used for Xian 1980 and GPS control network observed
     * 2000-2003. Adopted July 2008.
     */
    public const EPSG_CHINA_2000 = 'urn:ogc:def:datum:EPSG::1043';

    /**
     * Chos Malal 1914
     * Type: Geodetic
     * Extent: Argentina - Mendoza province, Neuquen province, western La Pampa province and western Rio Negro province
     * Chos Malal police station.
     * Also known as Quini-Huao. Replaced by Campo Inchauspe (code 6221) for topographic mapping, use for oil
     * exploration and production continues.
     */
    public const EPSG_CHOS_MALAL_1914 = 'urn:ogc:def:datum:EPSG::6160';

    /**
     * Chua
     * Type: Geodetic
     * Extent: Brazil - south of 18°S and west of 54°W, plus Distrito Federal. Paraguay - north
     * Fundamental point: Chua. Latitude: 19°45'41.160"S, longitude: 48°06'07.560"W (of Greenwich).
     * The Chua origin and associated network is in Brazil with a connecting traverse through northern Paraguay. It was
     * used in Brazil only as input into the Corrego Allegre adjustment and for government work in Distrito Federal.
     */
    public const EPSG_CHUA = 'urn:ogc:def:datum:EPSG::6224';

    /**
     * Cocos Islands 1965
     * Type: Geodetic
     * Extent: Cocos (Keeling) Islands - onshore
     * Fundamental point: Anna 1.
     */
    public const EPSG_COCOS_ISLANDS_1965 = 'urn:ogc:def:datum:EPSG::6708';

    /**
     * Combani 1950
     * Type: Geodetic
     * Extent: Mayotte - onshore
     * Combani South Base.
     * Replaced by RGM04 and Cadastre 1997 (datum codes 1036-37).
     */
    public const EPSG_COMBANI_1950 = 'urn:ogc:def:datum:EPSG::6632';

    /**
     * Conakry 1905
     * Type: Geodetic
     * Extent: Guinea - onshore
     * Fundamental point: Conakry. Latitude: 10.573766g N, longitude: 17.833682g W (of Paris).
     */
    public const EPSG_CONAKRY_1905 = 'urn:ogc:def:datum:EPSG::6315';

    /**
     * Congo 1960 Pointe Noire
     * Type: Geodetic
     * Extent: Congo
     * Fundamental point: Point Noire Astro. Latitude: 4°47'00.10"S, longitude: 11°51'01.55"E (of Greenwich).
     */
    public const EPSG_CONGO_1960_POINTE_NOIRE = 'urn:ogc:def:datum:EPSG::6282';

    /**
     * Constanta
     * Type: Vertical
     * Extent: Romania - onshore
     * Mean Sea Level at Constanta.
     * Normal-orthometric heights.
     */
    public const EPSG_CONSTANTA = 'urn:ogc:def:datum:EPSG::5179';

    /**
     * Copenhagen Commune Intermediate Datum
     * Type: Geodetic
     * Extent: Denmark - onshore - Copenhagen and surrounding area
     * Arbitrary origin, apparently based on monument coordinates given in the Generalstabens System.
     * Created in 2022 to support intermediate CRS KK-IRF in the transformation of coordinates between the historic
     * Copenhagen Commune CRS and ETRS89. The data are reconstructions based on information synthesized in historical
     * empirical transformations to ED50.
     */
    public const EPSG_COPENHAGEN_COMMUNE_INTERMEDIATE_DATUM = 'urn:ogc:def:datum:EPSG::1349';

    /**
     * Corrego Alegre 1961
     * Type: Geodetic
     * Extent: Brazil - onshore - between 18°S and 27°30'S, also east of 54°W between 15°S and 18°S
     * Fundamental point: Corrego Alegre. Latitude: 19°50'14.91"S, longitude: 48°57'41.98"W (of Greenwich).
     * Replaced by Corrego Alegre 1970-72 (datum code 6225). NIMA gives coordinates of origin as latitude:
     * 19°50'15.14"S, longitude: 48°57'42.75"W.
     */
    public const EPSG_CORREGO_ALEGRE_1961 = 'urn:ogc:def:datum:EPSG::1074';

    /**
     * Corrego Alegre 1970-72
     * Type: Geodetic
     * Extent: Brazil - onshore - west of 54°W and south of 18°S; also south of 15°S between 54°W and 42°W; also
     * east of 42°W
     * Fundamental point: Corrego Alegre. Latitude: 19°50'14.91"S, longitude: 48°57'41.98"W (of Greenwich).
     * Replaces 1961 adjustment (datum code 1074). Superseded by SAD69. NIMA gives coordinates of origin as latitude:
     * 19°50'15.14"S, longitude: 48°57'42.75"W; these may refer to 1961 adjustment.
     */
    public const EPSG_CORREGO_ALEGRE_1970_72 = 'urn:ogc:def:datum:EPSG::6225';

    /**
     * Costa Rica 2005
     * Type: Geodetic
     * Extent: Costa Rica
     * ITRF2000 at epoch 2005.83.  Network of 34 GPS stations throughout the country, five of which were connected to
     * four Caribbean area ITRF stations.
     * Replaces Ocotepeque (datum code 1070) in Costa Rica from March 2007.
     */
    public const EPSG_COSTA_RICA_2005 = 'urn:ogc:def:datum:EPSG::1065';

    /**
     * Croatian Terrestrial Reference System
     * Type: Geodetic
     * Extent: Croatia
     * Densification of ETRS89 in Croatia at epoch 1995.55.
     * Based on 78 control points with coordinates determined in ETRS89.
     */
    public const EPSG_CROATIAN_TERRESTRIAL_REFERENCE_SYSTEM = 'urn:ogc:def:datum:EPSG::6761';

    /**
     * Croatian Vertical Reference Datum 1971
     * Type: Vertical
     * Extent: Croatia - onshore
     * Mean sea level at five tide gauges in Dubrovnik, Split, Bakar, Rovinj and Kopar at epoch 1971.5
     * Replaces Trieste (datum code 1050).
     */
    public const EPSG_CROATIAN_VERTICAL_REFERENCE_DATUM_1971 = 'urn:ogc:def:datum:EPSG::5207';

    /**
     * Cyprus Geodetic Reference System 1993
     * Type: Geodetic
     * Extent: Cyprus - onshore
     * Station Chionistra (Mount Troodos). Network scale and orientation determined by connection of six stations to
     * ITRF91 in Europe at epoch 1993.1.
     * Survey plans and maps produced by DLS after 1993.
     */
    public const EPSG_CYPRUS_GEODETIC_REFERENCE_SYSTEM_1993 = 'urn:ogc:def:datum:EPSG::1112';

    /**
     * DIBA15 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Didcot to Banbury
     * Defined through the application of the DIBA15 NTv2 transformation (code 10205) to ETRS89 as realized through
     * OSNet v2009 CORS.
     * Created in 2022 to support intermediate CRS DIBA15-IRF in the emulation of the DIBA15 Snake map projection.
     */
    public const EPSG_DIBA15_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1339';

    /**
     * Dabola 1981
     * Type: Geodetic
     * Extent: Guinea - onshore.
     */
    public const EPSG_DABOLA_1981 = 'urn:ogc:def:datum:EPSG::6155';

    /**
     * Danger 1950
     * Type: Vertical
     * Extent: St Pierre and Miquelon - onshore
     * Marker near tide gauge at port of Saint Pierre. Height is 1.26 metres above zero of tide gauge.
     */
    public const EPSG_DANGER_1950 = 'urn:ogc:def:datum:EPSG::5190';

    /**
     * Dansk Normal Nul
     * Type: Vertical
     * Extent: Denmark - onshore
     * Mean Sea Level at 10 gauges.
     * Orthometric heights.
     */
    public const EPSG_DANSK_NORMAL_NUL = 'urn:ogc:def:datum:EPSG::5132';

    /**
     * Dansk Vertikal Reference 1990 (2000)
     * Type: Vertical
     * Extent: Denmark - onshore
     * Benchmark at Århus cathedral referenced to mean sea level determined during 1990 at 10 tide gauges: Esbjerg,
     * Fredericia, Frederikshavn, Gedser, Hirtshals, Hornbæk, Korsør, København, Slipshavn and Århus.
     * Helmert orthometric heights. First realization of DVR90, based on levelling.
     */
    public const EPSG_DANSK_VERTIKAL_REFERENCE_1990_2000 = 'urn:ogc:def:datum:EPSG::5206';

    /**
     * Dansk Vertikal Reference 1990 (2002)
     * Type: Vertical
     * Extent: Denmark - onshore
     * Benchmark at Århus cathedral referenced to mean sea level determined during 1990 at 10 tide gauges: Esbjerg,
     * Fredericia, Frederikshavn, Gedser, Hirtshals, Hornbæk, Korsør, København, Slipshavn and Århus.
     * First geoid-based realization of DVR90. Replaced by DVR90(2013).
     */
    public const EPSG_DANSK_VERTIKAL_REFERENCE_1990_2002 = 'urn:ogc:def:datum:EPSG::1368';

    /**
     * Dansk Vertikal Reference 1990 (2013)
     * Type: Vertical
     * Extent: Denmark - onshore
     * Benchmark at Århus cathedral referenced to mean sea level determined during 1990 at 10 tide gauges: Esbjerg,
     * Fredericia, Frederikshavn, Gedser, Hirtshals, Hornbæk, Korsør, København, Slipshavn and Århus.
     * Second geoid-based realization of DVR90. Replaces DVR90(2002). Replaced by DVR90(2023).
     */
    public const EPSG_DANSK_VERTIKAL_REFERENCE_1990_2013 = 'urn:ogc:def:datum:EPSG::1369';

    /**
     * Dansk Vertikal Reference 1990 (2023)
     * Type: Vertical
     * Extent: Denmark - onshore
     * Benchmark at Århus cathedral referenced to mean sea level determined during 1990 at 10 tide gauges: Esbjerg,
     * Fredericia, Frederikshavn, Gedser, Hirtshals, Hornbæk, Korsør, København, Slipshavn and Århus.
     * Second geoid-based realization of DVR90. Replaces DVR90(2013).
     */
    public const EPSG_DANSK_VERTIKAL_REFERENCE_1990_2023 = 'urn:ogc:def:datum:EPSG::1370';

    /**
     * Dansk Vertikal Reference 1990 ensemble
     * Type: Ensemble
     * Extent: Denmark - onshore.
     */
    public const EPSG_DANSK_VERTIKAL_REFERENCE_1990_ENSEMBLE = 'urn:ogc:def:datum:EPSG::1371';

    /**
     * Datum 73
     * Type: Geodetic
     * Extent: Portugal - mainland - onshore
     * Fundamental point:  TF4, Melrica. Latitude: 39°41'37.30"N, longitude: 8°07'53.31"W (of Greenwich).
     */
    public const EPSG_DATUM_73 = 'urn:ogc:def:datum:EPSG::6274';

    /**
     * Datum Altimetrico de Costa Rica 1952
     * Type: Vertical
     * Extent: Costa Rica - onshore
     * Mean Sea Level 1941-1952 at Puntarenas.
     * Orthometric heights.
     */
    public const EPSG_DATUM_ALTIMETRICO_DE_COSTA_RICA_1952 = 'urn:ogc:def:datum:EPSG::1226';

    /**
     * Datum Geodesi Nasional 1995
     * Type: Geodetic
     * Extent: Indonesia
     * ITRF91at epoch 1992.0.
     * Replaces ID74 and all older datums.
     */
    public const EPSG_DATUM_GEODESI_NASIONAL_1995 = 'urn:ogc:def:datum:EPSG::6755';

    /**
     * Dealul Piscului 1930
     * Type: Geodetic
     * Extent: Romania - onshore
     * Fundamental point: latitude 44°24'33.9606"N, longitude 26°06'44.8772"E (of Greenwich).
     * Replaced by Pulkovo 1942(58) (datum code 6179).
     */
    public const EPSG_DEALUL_PISCULUI_1930 = 'urn:ogc:def:datum:EPSG::6316';

    /**
     * Deception Island
     * Type: Geodetic
     * Extent: Antarctica - South Shetland Islands - Deception Island.
     */
    public const EPSG_DECEPTION_ISLAND = 'urn:ogc:def:datum:EPSG::6736';

    /**
     * Deir ez Zor
     * Type: Geodetic
     * Extent: Lebanon - onshore. Syrian Arab Republic - onshore
     * Fundamental point: Trig. 254 Deir. Latitude: 35°21'49.975"N, longitude: 40°05'46.770"E (of Greenwich).
     */
    public const EPSG_DEIR_EZ_ZOR = 'urn:ogc:def:datum:EPSG::6227';

    /**
     * Denmark Lowest Astronomic Tide (2023)
     * Type: Vertical
     * Extent: Denmark - offshore
     * Mean sea level as determined by updated satellite altimetry adjusted to LAT using coastal tide gauges and
     * improved global tide models. Defined with respect to ETRS89 through the dklat_2023 hydroid model.
     * Replaces DKLAT(2022).
     */
    public const EPSG_DENMARK_LOWEST_ASTRONOMIC_TIDE_2023 = 'urn:ogc:def:datum:EPSG::1375';

    /**
     * Denmark Lowest Astronomical Tide
     * Type: Ensemble
     * Extent: Denmark - offshore
     * LAT as defined through any DKLAT hydroid model without distinction.
     */
    public const EPSG_DENMARK_LOWEST_ASTRONOMICAL_TIDE = 'urn:ogc:def:datum:EPSG::1377';

    /**
     * Denmark Lowest Astronomical Tide (2022)
     * Type: Vertical
     * Extent: Denmark - offshore
     * Mean sea level as determined by satellite altimetry adjusted to LAT using coastal tide gauges and global tide
     * models. Defined with respect to ETRS89 through the dklat_2022 hydroid model.
     * Replaced by DKLAT(2023).
     */
    public const EPSG_DENMARK_LOWEST_ASTRONOMICAL_TIDE_2022 = 'urn:ogc:def:datum:EPSG::1373';

    /**
     * Denmark Mean Sea Level
     * Type: Ensemble
     * Extent: Denmark - offshore
     * MSL as defined through any DKMSL hydroid model without distinction.
     */
    public const EPSG_DENMARK_MEAN_SEA_LEVEL = 'urn:ogc:def:datum:EPSG::1376';

    /**
     * Denmark Mean Sea Level (2022)
     * Type: Vertical
     * Extent: Denmark - offshore
     * Mean sea level as determined by satellite altimetry and coastal tide gauges. Defined with respect to ETRS89
     * through the dkmsl_2022 hydroid model.
     * Replaced by DKMSL(2023).
     */
    public const EPSG_DENMARK_MEAN_SEA_LEVEL_2022 = 'urn:ogc:def:datum:EPSG::1372';

    /**
     * Denmark Mean Sea Level (2023)
     * Type: Vertical
     * Extent: Denmark - offshore
     * Mean sea level as determined by updated satellite altimetry and coastal tide gauges. Defined with respect to
     * ETRS89 through the dkmsl_2023 hydroid model.
     * Replaces DKMSL(2022).
     */
    public const EPSG_DENMARK_MEAN_SEA_LEVEL_2023 = 'urn:ogc:def:datum:EPSG::1374';

    /**
     * Deutsche Bahn Reference System
     * Type: Geodetic
     * Extent: Germany - onshore - states of Baden-Wurtemberg, Bayern, Berlin, Brandenburg, Bremen, Hamburg, Hessen,
     * Mecklenburg-Vorpommern, Niedersachsen, Nordrhein-Westfalen, Rheinland-Pfalz, Saarland, Sachsen, Sachsen-Anhalt,
     * Schleswig-Holstein, Thuringen
     * Defined by transformation from ETRS89 (transformation code 5826) to be an average of DHDN realizations across
     * all German states.
     * In DB_REF2016 only the vertical CRS component is updated, the geodetic CRS component of DB_REF is unchanged.
     */
    public const EPSG_DEUTSCHE_BAHN_REFERENCE_SYSTEM = 'urn:ogc:def:datum:EPSG::1081';

    /**
     * Deutsches Hauptdreiecksnetz
     * Type: Geodetic
     * Extent: Germany - states of former West Germany onshore - Baden-Wurtemberg, Bayern, Bremen, Hamburg, Hessen,
     * Niedersachsen, Nordrhein-Westfalen, Rheinland-Pfalz, Saarland, Schleswig-Holstein
     * Fundamental point: Rauenberg. Latitude: 52°27'12.021"N, longitude: 13°22'04.928"E (of Greenwich).  This
     * station was destroyed in 1910 and the station at Potsdam substituted as the fundamental point.
     */
    public const EPSG_DEUTSCHES_HAUPTDREIECKSNETZ = 'urn:ogc:def:datum:EPSG::6314';

    /**
     * Deutsches Haupthoehennetz 1912
     * Type: Vertical
     * Extent: Germany - onshore - states of Baden-Wurtemberg, Bayern, Berlin, Brandenburg, Bremen, Hamburg, Hessen,
     * Mecklenburg-Vorpommern, Niedersachsen, Nordrhein-Westfalen, Rheinland-Pfalz, Saarland, Sachsen, Sachsen-Anhalt,
     * Schleswig-Holstein, Thuringen
     * Height of reference point "Normalnullpunkt" at Berlin Observatory defined as 37.000m above MSL in 1879
     * (transferred to benchmarks near Hoppegarten in Müncheberg in 1912). Datum at Normaal Amsterdams Peil (NAP) is
     * mean high tide in 1684.
     * Uses Normal-orthometric heights.
     */
    public const EPSG_DEUTSCHES_HAUPTHOEHENNETZ_1912 = 'urn:ogc:def:datum:EPSG::1161';

    /**
     * Deutsches Haupthoehennetz 1985
     * Type: Vertical
     * Extent: Germany - states of former West Germany onshore - Baden-Wurtemberg, Bayern, Bremen, Hamburg, Hessen,
     * Niedersachsen, Nordrhein-Westfalen, Rheinland-Pfalz, Saarland, Schleswig-Holstein
     * Network adjusted in 1985. Height of reference point Wallenhorst defined as value from 1928 adjustment. Datum at
     * Normaal Amsterdams Peil (NAP) is mean high tide in 1684.
     * Replaced by DHHN92. Uses Normal-orthometric heights.
     */
    public const EPSG_DEUTSCHES_HAUPTHOEHENNETZ_1985 = 'urn:ogc:def:datum:EPSG::5182';

    /**
     * Deutsches Haupthoehennetz 1992
     * Type: Vertical
     * Extent: Germany - onshore - states of Baden-Wurtemberg, Bayern, Berlin, Brandenburg, Bremen, Hamburg, Hessen,
     * Mecklenburg-Vorpommern, Niedersachsen, Nordrhein-Westfalen, Rheinland-Pfalz, Saarland, Sachsen, Sachsen-Anhalt,
     * Schleswig-Holstein, Thuringen
     * Network adjusted in 1992. Geopotential number at reference point Wallenhorst defined as value from the
     * UELN-73/86 adjustment. Datum at Normaal Amsterdams Peil (NAP) is mean high tide in 1684.
     * Replaces DHHN85 in West Germany and SNN76 in East Germany. Uses Normal heights.
     */
    public const EPSG_DEUTSCHES_HAUPTHOEHENNETZ_1992 = 'urn:ogc:def:datum:EPSG::5181';

    /**
     * Deutsches Haupthoehennetz 2016
     * Type: Vertical
     * Extent: Germany
     * 2006-2012 levelling network adjusted to 72 points of the DHHN92. Datum at Normaal Amsterdams Peil (NAP) is mean
     * high tide in 1684. Extension offshore defined by the GCG2016 quasi-geoid model (CT code 9925).
     * Uses Normal heights in the mean tidal system.
     */
    public const EPSG_DEUTSCHES_HAUPTHOEHENNETZ_2016 = 'urn:ogc:def:datum:EPSG::1170';

    /**
     * Diego Garcia 1969
     * Type: Geodetic
     * Extent: British Indian Ocean Territory - Chagos Archipelago - Diego Garcia
     * Fundamental point: ISTS 073.
     */
    public const EPSG_DIEGO_GARCIA_1969 = 'urn:ogc:def:datum:EPSG::6724';

    /**
     * DoPw22 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Dovey Junction to Pwllheli
     * Defined through the application of the DoPw22 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS DoPw22-IRF in the emulation of the DoPw22 Snake map projection.
     */
    public const EPSG_DOPW22_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1334';

    /**
     * Dominica 1945
     * Type: Geodetic
     * Extent: Dominica - onshore
     * Fundamental point: station M12.
     */
    public const EPSG_DOMINICA_1945 = 'urn:ogc:def:datum:EPSG::6602';

    /**
     * Douala 1948
     * Type: Geodetic
     * Extent: Cameroon - coastal area
     * South pillar of Douala base; 4°00'40.64"N, 9°42'30.41"E (of Greenwich).
     * Replaced by Manoca 1962 datum (code 6193).
     */
    public const EPSG_DOUALA_1948 = 'urn:ogc:def:datum:EPSG::6192';

    /**
     * Douglas
     * Type: Vertical
     * Extent: Isle of Man - onshore
     * Mean Sea Level at Douglas 1865. Initially realised through levelling network adjustment, from 2002 redefined to
     * be realised through OSGM geoid model.
     * Orthometric heights.
     */
    public const EPSG_DOUGLAS = 'urn:ogc:def:datum:EPSG::5148';

    /**
     * Dunedin 1958
     * Type: Vertical
     * Extent: New Zealand - South Island - between approximately 44°S and 46°S - Dunedin vertical CRS area
     * MSL at Dunedin harbour 1918-1937.
     */
    public const EPSG_DUNEDIN_1958 = 'urn:ogc:def:datum:EPSG::5159';

    /**
     * Dunedin-Bluff 1960
     * Type: Vertical
     * Extent: New Zealand - South Island - Dunedin-Bluff vertical CRS area
     * Common adjustment of Dunedin 1958 and Bluff 1955 networks.
     */
    public const EPSG_DUNEDIN_BLUFF_1960 = 'urn:ogc:def:datum:EPSG::1040';

    /**
     * Durres
     * Type: Vertical
     * Extent: Albania - onshore
     * Mean Sea Level at Durres.
     * Normal-orthometric heights.
     */
    public const EPSG_DURRES = 'urn:ogc:def:datum:EPSG::5175';

    /**
     * EBBWV14 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Newport (Park Junction) to Ebbw Vale
     * Defined through the application of the EBBWV14 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS "EBBWV14-IRF" in the emulation of the EBBWV14 Snake map projection.
     */
    public const EPSG_EBBWV14_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1319';

    /**
     * ECML14 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the east coast mainline rail route from London (Kings Cross) via Newcastle to
     * Edinburgh
     * Defined through the application of the ECML14 NTv2 transformation from ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2024 to support intermediate CRS "ECML14-IRF" in the emulation of the ECML14 Snake map projection.
     */
    public const EPSG_ECML14_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1385';

    /**
     * ECML14_NB Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to rail routes from Newcastle Central to Ashington via Benton North Junction, and the
     * section from Bedlington to Morpeth
     * Defined through the application of the ECML14_NB NTv2 transformation (code 9759) to ETRS89 as realized through
     * OSNet v2009 CORS.
     * Created in 2021 to support intermediate CRS "ECML14_NB-IRF" in the emulation of the ECML14_NB Snake map
     * projection.
     */
    public const EPSG_ECML14_NB_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1310';

    /**
     * EGM2008 geoid
     * Type: Vertical
     * Extent: World
     * Derived through EGM2008 geoid undulation model consisting of spherical harmonic coefficients to degree 2190 and
     * order 2159 applied to the WGS 84 ellipsoid.
     * Replaces EGM96 geoid (datum code 5171). See transformation codes 3858 and 3859 for 2.5x2.5 and 1x1 arc minute
     * geoid undulation grid files derived from the spherical harmonic coefficients.
     */
    public const EPSG_EGM2008_GEOID = 'urn:ogc:def:datum:EPSG::1027';

    /**
     * EGM84 geoid
     * Type: Vertical
     * Extent: World
     * Derived through EGM84 geoid undulation model consisting of spherical harmonic coefficients to degree and order
     * 180 applied to the WGS 84 ellipsoid.
     * Replaced by EGM96 geoid (datum code 5171).
     */
    public const EPSG_EGM84_GEOID = 'urn:ogc:def:datum:EPSG::5203';

    /**
     * EGM96 geoid
     * Type: Vertical
     * Extent: World
     * Derived through EGM84 geoid undulation model consisting of spherical harmonic coefficients to degree and order
     * 360 applied to the WGS 84 ellipsoid.
     * Replaces EGM84 geoid (datum code 5203). Replaced by EGM2008 geoid (datum code 1027).
     */
    public const EPSG_EGM96_GEOID = 'urn:ogc:def:datum:EPSG::5171';

    /**
     * EOS21 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the complex of rail routes in the East of Scotland, incorporating the route from
     * Tweedbank through the Borders to Edinburgh; the line from Edinburgh to Aberdeen; routes via Kirkaldy and
     * Cowdenbeath; and routes via Leuchars and Perth to Dundee
     * Defined through the application of the EOS21 NTv2 transformation (code 9740) to ETRS89 as realized through OSNet
     * v2009 CORS.
     * Created in 2021 to support intermediate CRS "EOS21-IRF" in the emulation of the EOS21 Snake map projection.
     */
    public const EPSG_EOS21_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1308';

    /**
     * ETRF2000 Poland
     * Type: Geodetic
     * Extent: Poland
     * Polish densification of ETRS89 realized through adjustment of ASG-EUPOS network constrained to 35 EPN stations
     * in [email protected].
     * Adopted as official Polish reference frame from 2012-12-01 through Ordinance of the Council of Ministers of 15th
     * November 2012 on the state system of spatial reference system.
     */
    public const EPSG_ETRF2000_POLAND = 'urn:ogc:def:datum:EPSG::1305';

    /**
     * ETRS89/DREF91 Realization 2016
     * Type: Geodetic
     * Extent: Germany
     * Realized by GNSS campaign 2008. Results were transformed from IGS05 epoch 2008.46 to ITRF2005 to ETRF2000,
     * subsequently to ETRS89/DREF91 Realization 2002 (former German ETRS89 realization) by 3 rotation parameters.
     * German national realization of ETRS89. Replaces ETRS89/DREF91 Realization 2002 from 2016-12-01.
     */
    public const EPSG_ETRS89_DREF91_REALIZATION_2016 = 'urn:ogc:def:datum:EPSG::1353';

    /**
     * EWR2 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to East West Rail (Phase 2) routes from Oxford to Bicester, Bletchley and Bedford,
     * and from Claydon Junction to Aylesbury and Princes Risborough
     * Defined through the application of the EWR2 NTv2 transformation (code 9763) to ETRS89 as realized through OSNet
     * v2009 CORS.
     * Created in 2021 to support intermediate CRS "EWR2-IRF" in the emulation of the EWR2 Snake map projection.
     */
    public const EPSG_EWR2_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1311';

    /**
     * Easter Island 1967
     * Type: Geodetic
     * Extent: Chile - Easter Island onshore.
     */
    public const EPSG_EASTER_ISLAND_1967 = 'urn:ogc:def:datum:EPSG::6719';

    /**
     * Egypt 1907
     * Type: Geodetic
     * Extent: Egypt
     * Fundamental point: Station F1 (Venus). Latitude: 30°01'42.86"N, longitude: 31°16'33.60"E (of Greenwich).
     */
    public const EPSG_EGYPT_1907 = 'urn:ogc:def:datum:EPSG::6229';

    /**
     * Egypt 1930
     * Type: Geodetic
     * Extent: Egypt - onshore
     * Fundamental point: Station F1 (Venus). Latitude: 30°01'42.86"N, longitude: 31°16'37.05"E (of Greenwich).
     * Note that Egypt 1930 uses the International 1924 ellipsoid, unlike the Egypt 1907 datum (code 6229) which uses
     * the Helmert ellipsoid. Oil industry references to the Egypt 1930 datum name and the Helmert ellipsoid probably
     * mean Egypt 1907 datum.
     */
    public const EPSG_EGYPT_1930 = 'urn:ogc:def:datum:EPSG::6199';

    /**
     * Egypt Gulf of Suez S-650 TL
     * Type: Geodetic
     * Extent: Egypt - Gulf of Suez
     * Fundamental point: Station S-650 DMX. Adopted coordinates: latitude: 28°19'02.1907"N, longitude:
     * 33°06'36.6344"E (of Greenwich). The proper Egypt 1907 coordinates for S-650 differ from these by about 20m.
     * A coherent set of stations bordering the Gulf of Suez coordinated by Transit translocation ("TL") between 1980
     * and 1984. Based on incorrect Egypt 1907 values for origin station S-650. Differs from true Egypt 1907 by
     * approximately 20m.
     */
    public const EPSG_EGYPT_GULF_OF_SUEZ_S_650_TL = 'urn:ogc:def:datum:EPSG::6706';

    /**
     * El Hierro
     * Type: Vertical
     * Extent: Spain - Canary Islands - El Hierro onshore
     * Mean Sea Level at La Estaca harbour in 2000.
     * Orthometric heights.
     */
    public const EPSG_EL_HIERRO = 'urn:ogc:def:datum:EPSG::1284';

    /**
     * Estonia 1992
     * Type: Geodetic
     * Extent: Estonia - onshore
     * Densification from 4 ETRS89 points.
     * Based on ETRS89 as established during the 1992 Baltic campaign. Replaced by Estonia 1997 adjustment (code 6180).
     */
    public const EPSG_ESTONIA_1992 = 'urn:ogc:def:datum:EPSG::6133';

    /**
     * Estonia 1997
     * Type: Geodetic
     * Extent: Estonia
     * Densification of ETRS89 during EUREF-ESTONIA97 campaign through transformation from ITRF96 at epoch 1997.56.
     * Replaces Estonia 1992 adjustment (code 6133).
     */
    public const EPSG_ESTONIA_1997 = 'urn:ogc:def:datum:EPSG::6180';

    /**
     * Estonian Height System 2000
     * Type: Vertical
     * Extent: Estonia - onshore
     * Estonian realisation of EVRF2007. Relevelling observed  2004-2013 and reduced to epoch 2000 using the NKG2005LU
     * empirical land uplift model. EVRF2007 height of Poltsamaa fundamental bench mark (H=55.2114m) held fixed.
     * Uses Normal heights.
     */
    public const EPSG_ESTONIAN_HEIGHT_SYSTEM_2000 = 'urn:ogc:def:datum:EPSG::1298';

    /**
     * European Datum 1950
     * Type: Geodetic
     * Extent: Europe - west: Andorra; Cyprus; Denmark; Faroe Islands - onshore; France - offshore; Germany - offshore
     * North Sea; Gibraltar; Greece - offshore; Israel - offshore; Italy including San Marino and Vatican City State;
     * Ireland offshore; Malta; Netherlands - offshore; North Sea; Norway including Svalbard; Portugal - mainland -
     * offshore; Spain - onshore; Turkey; United Kingdom - UKCS offshore east of 6°W including Channel Islands
     * (Guernsey and Jersey). Egypt - Western Desert; Iraq - onshore; Jordan
     * Fundamental point: Potsdam (Helmert Tower). Latitude: 52°22'51.4456"N, longitude: 13°03'58.9283"E (of
     * Greenwich).
     */
    public const EPSG_EUROPEAN_DATUM_1950 = 'urn:ogc:def:datum:EPSG::6230';

    /**
     * European Datum 1950(1977)
     * Type: Geodetic
     * Extent: Iran
     * Extension of ED50 over Iran.
     * Sometimes referred to as ED50-ED77.
     */
    public const EPSG_EUROPEAN_DATUM_1950_1977 = 'urn:ogc:def:datum:EPSG::6154';

    /**
     * European Datum 1979
     * Type: Geodetic
     * Extent: Europe - west
     * Fundamental point: Potsdam (Helmert Tower). Latitude: 52°22'51.4456"N, longitude: 13°03'58.9283"E (of
     * Greenwich).
     * Replaced by 1987 adjustment.
     */
    public const EPSG_EUROPEAN_DATUM_1979 = 'urn:ogc:def:datum:EPSG::6668';

    /**
     * European Datum 1987
     * Type: Geodetic
     * Extent: Europe - west
     * Fundamental point: Potsdam (Helmert Tower). Latitude: 52°22'51.4456"N, longitude: 13°03'58.9283"E (of
     * Greenwich).
     */
    public const EPSG_EUROPEAN_DATUM_1987 = 'urn:ogc:def:datum:EPSG::6231';

    /**
     * European Libyan Datum 1979
     * Type: Geodetic
     * Extent: Libya
     * Extension of ED50 over Libya.
     */
    public const EPSG_EUROPEAN_LIBYAN_DATUM_1979 = 'urn:ogc:def:datum:EPSG::6159';

    /**
     * European Terrestrial Reference Frame 1989
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF89 at epoch 1989.0. Fixed to the stable part of the Eurasian tectonic plate through 3
     * rotation rates derived from the AM02 geophysical model.
     * Defined by transformation from ITRF89 (CT code 7932). Replaced by ETRF90 (datum code 1179).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_1989 = 'urn:ogc:def:datum:EPSG::1178';

    /**
     * European Terrestrial Reference Frame 1990
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF90 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3
     * translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the
     * AM02 geophysical model.
     * Defined by transformation from ITRF90 (CT code 7933). Replaces ETRF89 (datum code 1178). Replaced by ETRF91
     * (datum code 1180).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_1990 = 'urn:ogc:def:datum:EPSG::1179';

    /**
     * European Terrestrial Reference Frame 1991
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF91 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3
     * translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the
     * AM02 geophysical model.
     * Defined by transformation from ITRF91 (CT code 7934). Replaces ETRF90 (datum code 1179). Replaced by ETRF92
     * (datum code 1181).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_1991 = 'urn:ogc:def:datum:EPSG::1180';

    /**
     * European Terrestrial Reference Frame 1992
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF92 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3
     * translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the
     * NNR-NUVEL-1 geophysical model.
     * Defined by transformation from ITRF92 (CT code 7935). Replaces ETRF91 (datum code 1180). Replaced by ETRF93
     * (datum code 1182).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_1992 = 'urn:ogc:def:datum:EPSG::1181';

    /**
     * European Terrestrial Reference Frame 1993
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF93 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3
     * translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the
     * ITRF93 velocity field.
     * Defined by transformation from ITRF93 (CT code 7936). Replaces ETRF92 (datum code 1181). Replaced by ETRF94
     * (datum code 1183).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_1993 = 'urn:ogc:def:datum:EPSG::1182';

    /**
     * European Terrestrial Reference Frame 1994
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF94 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3
     * translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the
     * NNR-NUVEL-1A geophysical model.
     * Defined by transformation from ITRF94 (CT code 7937). Replaces ETRF93 (datum code 1182). Replaced by ETRF96
     * (datum code 1184).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_1994 = 'urn:ogc:def:datum:EPSG::1183';

    /**
     * European Terrestrial Reference Frame 1996
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF96 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3
     * translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the
     * NNR-NUVEL-1A geophysical model.
     * Defined by transformation from ITRF96 (CT code 7938). Replaces ETRF94 (datum code 1183). Replaced by ETRF97
     * (datum code 1185).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_1996 = 'urn:ogc:def:datum:EPSG::1184';

    /**
     * European Terrestrial Reference Frame 1997
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF97 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3
     * translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the
     * NNR-NUVEL-1A geophysical model.
     * Defined by transformation from ITRF97 (CT code 7939). Replaces ETRF96 (datum code 1184). Replaced by ETRF2000
     * (datum code 1186).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_1997 = 'urn:ogc:def:datum:EPSG::1185';

    /**
     * European Terrestrial Reference Frame 2000
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF2000 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3
     * translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the
     * ITRF2000 velocity field.
     * Defined by transformation from ITRF2000 (CT 7940). Replaces ETRF97. On the publication of ETRF2005 the EUREF TWG
     * recommended that ETRF2000 be the realization of ETRS89. ETRF2014 (code 1206) is technically superior to all
     * earlier realizations of ETRS89.
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_2000 = 'urn:ogc:def:datum:EPSG::1186';

    /**
     * European Terrestrial Reference Frame 2005
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF2005 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3
     * translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the
     * ITRF2005 velocity field.
     * Defined by transformation from ITRF2005 (CT 5900). On publication in 2007 of this reference frame, the EUREF TWG
     * recommended that ETRF2000 rather than this reference frame remained as the preferred realization of ETRS89.
     * Replaced by ETRF2014 (code 1206).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_2005 = 'urn:ogc:def:datum:EPSG::1204';

    /**
     * European Terrestrial Reference Frame 2014
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF2014 at epoch 1989.0. Fixed to the stable part of the Eurasian tectonic plate through 3
     * rotation rates derived from the ITRF2014 velocity field.
     * Defined by transformation from ITRF2014 (CT code 8366). Replaces ETRF2005 (datum code 1204). Technically
     * superior to ETRF2000 (datum code 1186).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_2014 = 'urn:ogc:def:datum:EPSG::1206';

    /**
     * European Terrestrial Reference Frame 2020
     * Type: Geodetic
     * Extent: Europe - ETRF extent - approximately 16°W to 33°E and 33°N to 84°N
     * Coincides with ITRF2020 at epoch 1989.0. Fixed to the stable part of the Eurasian tectonic plate through 3
     * rotation rates derived from the ITRF2020 velocity field.
     * Defined by transformation from ITRF2020 (CT code 10572). Replaces ETRF2014 (datum code 1206). Technically
     * superior to ETRF2000 (datum code 1186).
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_FRAME_2020 = 'urn:ogc:def:datum:EPSG::1382';

    /**
     * European Terrestrial Reference System 1989 ensemble
     * Type: Ensemble
     * Extent: Europe: Albania; Andorra; Austria; Belgium; Bosnia and Herzegovina; Bulgaria; Croatia; Czechia; Denmark;
     * Estonia; Faroe Islands; Finland; France; Germany; Gibraltar; Greece; Hungary; Ireland; Italy; Kosovo; Latvia;
     * Liechtenstein; Lithuania; Luxembourg; Malta; Moldova; Monaco; Montenegro; Netherlands; North Macedonia; Norway
     * including Svalbard and Jan Mayen; Poland; Portugal - mainland; Romania; San Marino; Serbia; Slovakia; Slovenia;
     * Spain - mainland and Balearic islands; Sweden; Switzerland; UK including Channel Islands and Isle of Man;
     * Vatican City State
     * Has been realized through ETRF89, ETRF90, ETRF91, ETRF92, ETRF93, ETRF94, ETRF96, ETRF97, ETRF2000, ETRF2005,
     * ETRF2014 and ETRF2020. This 'ensemble' covers any or all of these realizations without distinction.
     */
    public const EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_SYSTEM_1989_ENSEMBLE = 'urn:ogc:def:datum:EPSG::6258';

    /**
     * European Vertical Reference Frame 2000
     * Type: Vertical
     * Extent: Europe - onshore - Andorra; Austria; Belgium; Bosnia and Herzegovina; Croatia; Czechia; Denmark;
     * Estonia; Finland; France - mainland; Germany; Gibraltar; Hungary; Italy - mainland and Sicily; Latvia;
     * Liechtenstein; Lithuania; Luxembourg; Netherlands; Norway; Poland; Portugal - mainland; Romania; San Marino;
     * Slovakia; Slovenia; Spain - mainland; Sweden; Switzerland; UK - Great Britain mainland; Vatican City State
     * Height at Normaal Amsterdams Peil (NAP) is zero, defined through height at UELN bench mark 13600 (52°22'53"N
     * 4°54'34"E) of 0.71599m. Datum at NAP is mean high tide in 1684.
     * Realized by geopotential numbers and Normal heights of the United European Levelling Network. Replaced by
     * EVRF2007 (datum code 5215).
     */
    public const EPSG_EUROPEAN_VERTICAL_REFERENCE_FRAME_2000 = 'urn:ogc:def:datum:EPSG::5129';

    /**
     * European Vertical Reference Frame 2000 Austria
     * Type: Vertical
     * Extent: Austria
     * Geopotential numbers of the EVRF2000 (UELN95/98) node points in Austria converted to orthometric heights using a
     * digital surface model.
     * Geoid surface is smoother than the EVRF2000 quasigeoid.
     */
    public const EPSG_EUROPEAN_VERTICAL_REFERENCE_FRAME_2000_AUSTRIA = 'urn:ogc:def:datum:EPSG::1261';

    /**
     * European Vertical Reference Frame 2007
     * Type: Vertical
     * Extent: Europe - onshore - Andorra; Austria; Belgium; Bosnia and Herzegovina; Bulgaria; Croatia; Czechia;
     * Denmark; Estonia; Finland; France - mainland; Germany; Gibraltar, Hungary; Italy - mainland and Sicily; Latvia;
     * Liechtenstein; Lithuania; Luxembourg; Netherlands; Norway; Poland; Portugal - mainland; Romania; San Marino;
     * Slovakia; Slovenia; Spain - mainland; Sweden; Switzerland; UK - Great Britain mainland; Vatican City State
     * Least squares fit to 13 stations of the EVRF2000 solution. Reduced to epoch 2000.0 for Nordic countries using
     * the NKG2005LU uplift model.
     * Realized by geopotential numbers and Normal heights of the United European Levelling Network. Replaces EVRF2000
     * (datum code 5129). Replaced by EVRF2019 (datum code 1274).
     */
    public const EPSG_EUROPEAN_VERTICAL_REFERENCE_FRAME_2007 = 'urn:ogc:def:datum:EPSG::5215';

    /**
     * European Vertical Reference Frame 2007 Poland
     * Type: Vertical
     * Extent: Poland - onshore
     * Origin: Mean North Sea Level at Amsterdam tide gauge. Normal heights obtained from adjustment of precise
     * leveling campaigns conducted during 1998 - 2012 reduced to epoch 2008.00.
     *
     * Uses Normal heights.
     */
    public const EPSG_EUROPEAN_VERTICAL_REFERENCE_FRAME_2007_POLAND = 'urn:ogc:def:datum:EPSG::1297';

    /**
     * European Vertical Reference Frame 2019
     * Type: Vertical
     * Extent: Europe - onshore - Andorra; Austria; Belarus; Belgium; Bosnia and Herzegovina; Bulgaria; Croatia;
     * Czechia; Denmark; Estonia; Finland; France - mainland; Germany; Gibraltar, Hungary; Italy - mainland and Sicily;
     * Latvia; Liechtenstein; Lithuania; Luxembourg; Netherlands; North Macedonia; Norway; Poland; Portugal - mainland;
     * Romania; Russia – west of approximately 60°E; San Marino; Slovakia; Slovenia; Spain - mainland; Sweden;
     * Switzerland; UK - Great Britain mainland; Ukraine; Vatican City State
     * Fixed to geopotential values of 12 stable stations of the EVRF2007 solution. Re-adjusted in September 2020.
     * Reduced to epoch 2000.0 for Nordic countries and Russia using the NKG2016LU_lev uplift model and for Switzerland
     * using CHVRF15 velocities.
     * Following EVRS conventions, EVRF2019 is a zero-tide surface. Replaces EVRF2007 (datum code 5215).
     */
    public const EPSG_EUROPEAN_VERTICAL_REFERENCE_FRAME_2019 = 'urn:ogc:def:datum:EPSG::1274';

    /**
     * European Vertical Reference Frame 2019 mean tide
     * Type: Vertical
     * Extent: Europe - onshore - Andorra; Austria; Belarus; Belgium; Bosnia and Herzegovina; Bulgaria; Croatia;
     * Czechia; Denmark; Estonia; Finland; France - mainland; Germany; Gibraltar, Hungary; Italy - mainland and Sicily;
     * Latvia; Liechtenstein; Lithuania; Luxembourg; Netherlands; North Macedonia; Norway; Poland; Portugal - mainland;
     * Romania; Russia – west of approximately 60°E; San Marino; Slovakia; Slovenia; Spain - mainland; Sweden;
     * Switzerland; UK - Great Britain mainland; Ukraine; Vatican City State
     * Derived from 2020-09 zero-tide EVRF2019 adjustment by Cmean = Czero + (0.28841*sin^2(phi)) +
     * (0.00195*sin^4(phi)) - 0.09722 - 0.08432 kgal.m. The offset of 0.08432 forces the mean-tide height to the
     * zero-tide height at the EVRF2000 origin in Amsterdam.
     * Mean-tide surface, describing how water flows. See EVRF2019 (datum code 1274) for zero-tide surface which is
     * consistent with ETRS conventions.
     */
    public const EPSG_EUROPEAN_VERTICAL_REFERENCE_FRAME_2019_MEAN_TIDE = 'urn:ogc:def:datum:EPSG::1287';

    /**
     * FNL22 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Inverness to Thurso and Wick
     * Defined through the application of the FNL22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
     * Created in 2022 to support intermediate CRS "FNL22" in the emulation of the FNL22 Snake map projection.
     */
    public const EPSG_FNL22_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1321';

    /**
     * Fahud
     * Type: Geodetic
     * Extent: Oman - mainland onshore
     * Fundamental point: Station NO68-024 Fahud. Latitude: 22°17'31.182"N, longitude: 56°29'18.820"E (of Greenwich).
     * Replaced by PSD93 (code 6134).
     */
    public const EPSG_FAHUD = 'urn:ogc:def:datum:EPSG::6232';

    /**
     * Fahud Height Datum
     * Type: Vertical
     * Extent: Oman - mainland onshore
     * Single MSL determination at Mina Al Fahal.
     * Based on reciprocal trigonometric heighting. Replaced by PHD93 Datum (code 5123) in 1993.
     */
    public const EPSG_FAHUD_HEIGHT_DATUM = 'urn:ogc:def:datum:EPSG::5124';

    /**
     * Fair Isle
     * Type: Vertical
     * Extent: UK - Great Britain - Scotland - Fair Isle onshore
     * Orthometric heights.
     */
    public const EPSG_FAIR_ISLE = 'urn:ogc:def:datum:EPSG::5139';

    /**
     * Famagusta 1960
     * Type: Vertical
     * Extent: Cyprus - onshore
     * Mean sea level at Famagusta Harbour.
     * Orthometric heights.
     */
    public const EPSG_FAMAGUSTA_1960 = 'urn:ogc:def:datum:EPSG::1148';

    /**
     * Fao
     * Type: Vertical
     * Extent: Iraq - onshore southeast; Iran - onshore northern Gulf coast and west bordering southeast Iraq
     * Established by Hunting Surveys for IPC. In Iran replaced by Bandar Abbas (code 5150). At time of record creation
     * NIOC data in Ahwaz area still usually referenced to Fao. In Iraq replaced by Fao 1979 (code 1028).
     */
    public const EPSG_FAO = 'urn:ogc:def:datum:EPSG::5149';

    /**
     * Fao 1979
     * Type: Vertical
     * Extent: Iraq - onshore
     * Average sea level at Fao during two-year period in mid/late 1970s.
     * Levelling network established by Polservice consortium. Replaces Fao (datum code 5149) in Iraq.
     */
    public const EPSG_FAO_1979 = 'urn:ogc:def:datum:EPSG::1028';

    /**
     * Faroe Datum 1954
     * Type: Geodetic
     * Extent: Faroe Islands - onshore
     * Astronomical observations at 3 points.
     * Replaced by ED50 in late 1970's for all purposes other than cadastre. Replaced by fk89 for cadastre.
     */
    public const EPSG_FAROE_DATUM_1954 = 'urn:ogc:def:datum:EPSG::6741';

    /**
     * Faroe Islands Vertical Reference 2009
     * Type: Vertical
     * Extent: Faroe Islands - onshore
     * Mean Tidal Height System.
     */
    public const EPSG_FAROE_ISLANDS_VERTICAL_REFERENCE_2009 = 'urn:ogc:def:datum:EPSG::1059';

    /**
     * Fatu Iva 72
     * Type: Geodetic
     * Extent: French Polynesia - Marquesas Islands - Fatu Hiva
     * Fundamental point: Latitude: 9°25'58.00"S, longitude: 138°55'06.25"W (of Greenwich).
     * Recomputed by IGN in 1972 using origin and observations of 1953-1955 Mission Hydrographique des Establissements
     * Francais d'Oceanie (MHEFO 55). Replaced by RGPF (datum code 6687).
     */
    public const EPSG_FATU_IVA_72 = 'urn:ogc:def:datum:EPSG::6688';

    /**
     * Fehmarnbelt Datum 2010
     * Type: Geodetic
     * Extent: Fehmarnbelt area of Denmark and Germany
     * ITRF2005 at epoch 2010.14.
     * Defined through coordinates of four permanant GNSS stations.
     */
    public const EPSG_FEHMARNBELT_DATUM_2010 = 'urn:ogc:def:datum:EPSG::1078';

    /**
     * Fehmarnbelt Vertical Reference 2010
     * Type: Vertical
     * Extent: Fehmarnbelt area of Denmark and Germany
     * Realised by precise levelling between tide gauges at Marienleuchte (Germany), Rodbyhavn (Denmark) and four
     * Fehmarnbelt project GNSS stations.
     */
    public const EPSG_FEHMARNBELT_VERTICAL_REFERENCE_2010 = 'urn:ogc:def:datum:EPSG::1079';

    /**
     * Fiji 1956
     * Type: Geodetic
     * Extent: Fiji - onshore - Vanua Levu, Taveuni, Viti Levu and and immediately adjacent smaller islands of Yasawa
     * and Kandavu groups
     * Latitude origin was obtained astronomically at station Rasusuva = 17°49'03.13"S,  longitude origin was obtained
     * astronomically at station Suva = 178°25'35.835"E (of Greenwich).
     * For topographic mapping replaces Viti Levu 1912 and Vanua Levu 1915. Replaced by Fiji Geodetic Datum 1986.
     */
    public const EPSG_FIJI_1956 = 'urn:ogc:def:datum:EPSG::6721';

    /**
     * Fiji Geodetic Datum 1986
     * Type: Geodetic
     * Extent: Fiji - onshore. Includes Viti Levu, Vanua Levu, Taveuni, the Yasawa Group, the Kadavu Group, the Lau
     * Islands and Rotuma Islands
     * NWL 9D coordinates of 6 stations on Vitu Levu and Vanua Levu.
     * Replaces Viti Levu 1912, Vanua Levu 1915 and Fiji 1956.
     */
    public const EPSG_FIJI_GEODETIC_DATUM_1986 = 'urn:ogc:def:datum:EPSG::6720';

    /**
     * Final Datum 1958
     * Type: Geodetic
     * Extent: Iran - Arwaz area and onshore Gulf coast west of 54°E, Lavan Island, offshore Balal field and South
     * Pars blocks 2 and 3
     * Fundamental point: Maniyur.  Latitude: 31°23'59.19"N, longitude: 48°32'31.38"E (of Greenwich).
     * Network included in Nahrwan 1967 adjustment.
     */
    public const EPSG_FINAL_DATUM_1958 = 'urn:ogc:def:datum:EPSG::6132';

    /**
     * Flannan Isles
     * Type: Vertical
     * Extent: UK - Great Britain - Scotland - Flannan Isles onshore
     * Orthometric heights.
     */
    public const EPSG_FLANNAN_ISLES = 'urn:ogc:def:datum:EPSG::5146';

    /**
     * Formentera
     * Type: Vertical
     * Extent: Spain - Balearic Islands - Formentera - onshore
     * Mean Sea Level at La Sabina harbour between 2000-10-25 and 2001-04-18.
     * Orthometric heights.
     */
    public const EPSG_FORMENTERA = 'urn:ogc:def:datum:EPSG::1362';

    /**
     * Fort Marigot
     * Type: Geodetic
     * Extent: Guadeloupe - onshore - St Martin and St Barthélemy islands
     * Replaced by RRAF 1991 (datum code 1047).
     */
    public const EPSG_FORT_MARIGOT = 'urn:ogc:def:datum:EPSG::6621';

    /**
     * Foula
     * Type: Vertical
     * Extent: UK - Great Britain - Scotland - Foula onshore
     * Orthometric heights.
     */
    public const EPSG_FOULA = 'urn:ogc:def:datum:EPSG::5141';

    /**
     * Fuerteventura
     * Type: Vertical
     * Extent: Spain - Canary Islands - Fuerteventura onshore
     * Mean Sea Level at Puerto del Rosario harbour between 1999-09-08 and 2000-12-31.
     * Orthometric heights.
     */
    public const EPSG_FUERTEVENTURA = 'urn:ogc:def:datum:EPSG::1279';

    /**
     * GBK19 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Glasgow to Kilmarnock via Barrhead and the branch to East
     * Kilbride
     * Defined through the application of the GBK19 NTv2 transformation (code 9454) to ETRS89 as realized through OSNet
     * v2009 CORS.
     * Created in 2020 to support intermediate CRS "GBK19-IRF" in the emulation of the combined GBK19 Snake map
     * projection.
     */
    public const EPSG_GBK19_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1289';

    /**
     * GNTRANS
     * Type: Vertical
     * Extent: Germany - onshore - states of Baden-Wurtemberg, Bayern, Berlin, Brandenburg, Bremen, Hamburg, Hessen,
     * Mecklenburg-Vorpommern, Niedersachsen, Nordrhein-Westfalen, Rheinland-Pfalz, Saarland, Sachsen, Sachsen-Anhalt,
     * Schleswig-Holstein, Thuringen
     * Surface defined by the EGG97 quasi-geoid model modified in GNTRANS to achieve absolute position optimised for
     * use with DB_REF.
     * Implemented in GNTRANS. The GNTRANS height surface is available only through the GNTRANS application. Replaced
     * by the GNTRANS2016 height surface (datum code 1318).
     */
    public const EPSG_GNTRANS = 'urn:ogc:def:datum:EPSG::1316';

    /**
     * GNTRANS2016
     * Type: Vertical
     * Extent: Germany - onshore - states of Baden-Wurtemberg, Bayern, Berlin, Brandenburg, Bremen, Hamburg, Hessen,
     * Mecklenburg-Vorpommern, Niedersachsen, Nordrhein-Westfalen, Rheinland-Pfalz, Saarland, Sachsen, Sachsen-Anhalt,
     * Schleswig-Holstein, Thuringen
     * Surface defined by the GCG2016 quasi-geoid model applied to ETRS89.
     * Approximates the national DHHN2016 levelling surface to around 1cm in lowlands and 2cm in high mountains, but
     * unlike DHHN2016 it is defined by the GCG2016 geoid model. Like DHHN2016, uses Normal heights in the mean tide
     * system.
     */
    public const EPSG_GNTRANS2016 = 'urn:ogc:def:datum:EPSG::1318';

    /**
     * GWPBS22 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from London (Paddington) to Swansea
     * Defined through the application of the GWPBS22 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS GWPBS22-IRF in the emulation of the GWPBS22 Snake map projection.
     */
    public const EPSG_GWPBS22_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1340';

    /**
     * GWWAB22 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail routes around Cardiff and the valleys
     * Defined through the application of the GWWAB22 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS GWWAB22-IRF in the emulation of the GWWAB22 Snake map projection.
     */
    public const EPSG_GWWAB22_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1341';

    /**
     * GWWWA22 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail routes from Swansea to Pembroke Dock, Milford Haven and Fishguard
     * Defined through the application of the GWWWA22 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS GWWWA22-IRF in the emulation of the GWWWA22 Snake map projection.
     */
    public const EPSG_GWWWA22_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1342';

    /**
     * Gambia
     * Type: Geodetic
     * Extent: Gambia - onshore.
     */
    public const EPSG_GAMBIA = 'urn:ogc:def:datum:EPSG::1139';

    /**
     * Gan 1970
     * Type: Geodetic
     * Extent: Maldives - onshore
     * In some references incorrectly named "Gandajika 1970". See datum code 6685.
     */
    public const EPSG_GAN_1970 = 'urn:ogc:def:datum:EPSG::6684';

    /**
     * Garoua
     * Type: Geodetic
     * Extent: Cameroon - Garoua area
     * Fundamental point: IGN astronomical station and benchmark no. 16 at Tongo. Latitude 8°55'08.74"N, longitude
     * 13°30'43.19"E (of Greenwich).
     */
    public const EPSG_GAROUA = 'urn:ogc:def:datum:EPSG::6197';

    /**
     * Gebrauchshohen ADRIA
     * Type: Vertical
     * Extent: Austria
     * Reference point Hutbiegl defined relative to mean sea level at Trieste in 1875.
     * Normal-orthometric heights.
     */
    public const EPSG_GEBRAUCHSHOHEN_ADRIA = 'urn:ogc:def:datum:EPSG::5176';

    /**
     * Generalstabens System Bornholm Intermediate Datum
     * Type: Geodetic
     * Extent: Denmark - Bornholm onshore
     * The old Copenhagen Observatory at Rundetårn. Originally, longitudes were reckoned from the meridian through the
     * observatory but in this reconstruction longitudes are referenced to the Greenwich meridian.
     * Created in 2022 to support intermediate CRS GSB-IRF in the transformation of coordinates between the historic
     * Generalstaben System and ETRS89. The data are reconstructions based on information synthesized in historical
     * empirical transformations to ED50.
     */
    public const EPSG_GENERALSTABENS_SYSTEM_BORNHOLM_INTERMEDIATE_DATUM = 'urn:ogc:def:datum:EPSG::1348';

    /**
     * Generalstabens System Intermediate Datum
     * Type: Geodetic
     * Extent: Denmark - onshore Jutland, Funen, Zealand and Lolland
     * The old Copenhagen Observatory at Rundetårn. Originally, longitudes were reckoned from the meridian through the
     * observatory but in this reconstruction longitudes are referenced to the Greenwich meridian.
     * Created in 2022 to support intermediate CRS GS-IRF in the transformation of coordinates between the historic
     * Generalstaben System and ETRS89. The data are reconstructions based on information synthesized in historical
     * empirical transformations to ED50.
     */
    public const EPSG_GENERALSTABENS_SYSTEM_INTERMEDIATE_DATUM = 'urn:ogc:def:datum:EPSG::1347';

    /**
     * Genoa 1942
     * Type: Vertical
     * Extent: Italy - mainland (including San Marino and Vatican City State) and Sicily
     * Mean Sea Level at Genoa (Ponte Morosini) 1937-1946.
     * Orthometric heights.
     */
    public const EPSG_GENOA_1942 = 'urn:ogc:def:datum:EPSG::1051';

    /**
     * Geocentric Datum Brunei Darussalam 2009
     * Type: Geodetic
     * Extent: Brunei Darussalam
     * ITRF2005 at epoch 2009.45
     * Replaces use of Timbalai from July 2009.
     */
    public const EPSG_GEOCENTRIC_DATUM_BRUNEI_DARUSSALAM_2009 = 'urn:ogc:def:datum:EPSG::1056';

    /**
     * Geocentric Datum of Australia 1994
     * Type: Geodetic
     * Extent: Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island,
     * Cocos (Keeling) Islands, Norfolk Island
     * ITRF92 at epoch 1994.0.
     */
    public const EPSG_GEOCENTRIC_DATUM_OF_AUSTRALIA_1994 = 'urn:ogc:def:datum:EPSG::6283';

    /**
     * Geocentric Datum of Australia 2020
     * Type: Geodetic
     * Extent: Australia including Lord Howe Island, Macquarie Island, Ashmore and Cartier Islands, Christmas Island,
     * Cocos (Keeling) Islands, Norfolk Island
     * ITRF2014 at epoch 2020.0.
     */
    public const EPSG_GEOCENTRIC_DATUM_OF_AUSTRALIA_2020 = 'urn:ogc:def:datum:EPSG::1168';

    /**
     * Geodetic Datum of 1965
     * Type: Geodetic
     * Extent: Ireland - onshore. UK - Northern Ireland (Ulster) - onshore
     * Adjusted to best mean fit 9 stations of the OSNI 1952 primary adjustment in Northern Ireland plus the 1965
     * values of 3 stations in the Republic of Ireland.
     * Differences from the 1965 adjustment (datum code 6299) are: average difference in Eastings 0.092m; average
     * difference in Northings 0.108m; maximum vector difference 0.548m.
     */
    public const EPSG_GEODETIC_DATUM_OF_1965 = 'urn:ogc:def:datum:EPSG::6300';

    /**
     * Geodetic Datum of Malaysia 2000
     * Type: Geodetic
     * Extent: Malaysia. Includes peninsular Malayasia, Sabah and Sarawak
     * ITRF2000, epoch 2000.0.
     * Replaces all older Malaysian datums.
     */
    public const EPSG_GEODETIC_DATUM_OF_MALAYSIA_2000 = 'urn:ogc:def:datum:EPSG::6742';

    /**
     * Geodezicheskaya Sistema Koordinat 2011
     * Type: Geodetic
     * Extent: Russia
     * Coordinates of the Russian fundamental astronomic-geodetic network (about 50 stations) at epoch 2011.0.
     */
    public const EPSG_GEODEZICHESKAYA_SISTEMA_KOORDINAT_2011 = 'urn:ogc:def:datum:EPSG::1159';

    /**
     * Gisborne 1926
     * Type: Vertical
     * Extent: New Zealand - North Island - Gisborne vertical CRS area
     * MSL at Gisborne harbour 1926.
     */
    public const EPSG_GISBORNE_1926 = 'urn:ogc:def:datum:EPSG::5160';

    /**
     * Gran Canaria
     * Type: Vertical
     * Extent: Spain - Canary Islands - Gran Canaria onshore
     * Mean Sea Level at Las Palmas de Gran Canaria harbour between 1992 and 1997.
     * Orthometric heights.
     */
    public const EPSG_GRAN_CANARIA = 'urn:ogc:def:datum:EPSG::1280';

    /**
     * Grand Cayman Geodetic Datum 1959
     * Type: Geodetic
     * Extent: Cayman Islands - Grand Cayman
     * Fundamental point: GC1. Latitude: 19°17'54.43"N, longitude: 81°22'37.17"W (of Greenwich).
     * Replaced by CIGD11 (datum code 1100).
     */
    public const EPSG_GRAND_CAYMAN_GEODETIC_DATUM_1959 = 'urn:ogc:def:datum:EPSG::6723';

    /**
     * Grand Cayman Vertical Datum 1954
     * Type: Vertical
     * Extent: Cayman Islands - Grand Cayman.
     */
    public const EPSG_GRAND_CAYMAN_VERTICAL_DATUM_1954 = 'urn:ogc:def:datum:EPSG::1097';

    /**
     * Grand Comoros
     * Type: Geodetic
     * Extent: Comoros - Njazidja (Grande Comore)
     * Fundamental point: M'Tsaoueni.  Latitude: 11°28'32.200"S, longitude: 43°15'42.315"E (of Greenwich).
     */
    public const EPSG_GRAND_COMOROS = 'urn:ogc:def:datum:EPSG::6646';

    /**
     * Greek
     * Type: Geodetic
     * Extent: Greece - onshore
     * Fundamental point: Athens Observatory. Latitude 37°58'20.132"N, longitude 23°42'58.815"E (of Greenwich)
     * See geodetic datum alias 6404. Used as basis of topographic mapping based on Hatt projection. Replaced by GGRS87
     * (code 6121).
     */
    public const EPSG_GREEK = 'urn:ogc:def:datum:EPSG::6120';

    /**
     * Greek (Athens)
     * Type: Geodetic
     * Extent: Greece - onshore
     * Fundamental point: Athens Observatory. Latitude 37°58'20.132"N, longitude 0°E (of Athens).
     * See geodetic datum alias 6404. Used as basis of topographic mapping based on Hatt projection.
     */
    public const EPSG_GREEK_ATHENS = 'urn:ogc:def:datum:EPSG::6815';

    /**
     * Greek Geodetic Reference System 1987
     * Type: Geodetic
     * Extent: Greece - onshore
     * Fundamental point: Dionysos. Latitude 38°04'33.8"N, longitude 23°55'51.0"E of Greenwich; geoid height 7.0 m.
     * Replaced (old) Greek datum. Oil industry work based on ED50.
     */
    public const EPSG_GREEK_GEODETIC_REFERENCE_SYSTEM_1987 = 'urn:ogc:def:datum:EPSG::6121';

    /**
     * Greenland 1996
     * Type: Geodetic
     * Extent: Greenland
     * ITRF94 at epoch 1996.62
     * Replaces Ammassalik 1958, Qornoq 1927 and Scoresbysund 1952.
     */
    public const EPSG_GREENLAND_1996 = 'urn:ogc:def:datum:EPSG::6747';

    /**
     * Greenland Local Mean Sea Level (2022)
     * Type: Vertical
     * Extent: Greenland - onshore
     * 77 disconnected local levelling nets introduced between 1945 and 1983 each tied to local mean sea level.
     * GLLMSL has been introduced to accomodate transformations between older local height systems and the modern
     * nation-wide height systems. In effect these datums are now defined by their transformation to GVR2016.
     */
    public const EPSG_GREENLAND_LOCAL_MEAN_SEA_LEVEL_2022 = 'urn:ogc:def:datum:EPSG::1378';

    /**
     * Greenland Lowest Astronomic Tide (2023)
     * Type: Vertical
     * Extent: Greenland - offshore
     * Mean sea level as determined by satellite altimetry adjusted to LAT using coastal tide gauges and global tide
     * models. Defined with respect to GR96 through the gllat_2023 hydroid model.
     */
    public const EPSG_GREENLAND_LOWEST_ASTRONOMIC_TIDE_2023 = 'urn:ogc:def:datum:EPSG::1388';

    /**
     * Greenland Mean Sea Level (2023)
     * Type: Vertical
     * Extent: Greenland - offshore
     * Mean sea level as determined by satellite altimetry and coastal tide gauges. Defined with respect to GR96
     * through the glmsl_2023 hydroid model.
     */
    public const EPSG_GREENLAND_MEAN_SEA_LEVEL_2023 = 'urn:ogc:def:datum:EPSG::1387';

    /**
     * Greenland Vertical Reference 2000
     * Type: Vertical
     * Extent: Greenland between 59°N and 84°N and west of 10°W
     * Defined through the gravimetric geoid 2000 model locally aligned with MSL at a number of sites.
     * Orthometric heights. Replaced by GVR2016.
     */
    public const EPSG_GREENLAND_VERTICAL_REFERENCE_2000 = 'urn:ogc:def:datum:EPSG::1199';

    /**
     * Greenland Vertical Reference 2016
     * Type: Vertical
     * Extent: Greenland between 58°N and 85°N and west of 7°W
     * Defined through the gravimetric geoid 2016 model locally aligned to MSL as measured at Nuuk during the 1960s.
     * Orthometric heights. Replaces GVR2000.
     */
    public const EPSG_GREENLAND_VERTICAL_REFERENCE_2016 = 'urn:ogc:def:datum:EPSG::1200';

    /**
     * Grenada 1953
     * Type: Geodetic
     * Extent: Grenada and southern Grenadine Islands - onshore
     * Fundamental point: station GS8, Sante Marie.
     */
    public const EPSG_GRENADA_1953 = 'urn:ogc:def:datum:EPSG::6603';

    /**
     * Guadeloupe 1948
     * Type: Geodetic
     * Extent: Guadeloupe - onshore - Basse-Terre, Grande-Terre, La Desirade, Marie-Galante, Les Saintes
     * Replaced by RRAF 1991 (datum code 1047).
     */
    public const EPSG_GUADELOUPE_1948 = 'urn:ogc:def:datum:EPSG::6622';

    /**
     * Guadeloupe 1951
     * Type: Vertical
     * Extent: Guadeloupe - onshore - Basse-Terre and Grande-Terre
     * Mean sea level July 1947 to June 1948 at Pointe-Fouillole (Pointe-à-Pitre harbour). Origin = marker AO'-12 with
     * height of 1.917m above msl.
     * Orthometric heights. Replaced by Guadeloupe 1988 (datum code 5155). Guadeloupe 1951 height 0.00m is 0.629m above
     * 1947-48 sounding datum.
     */
    public const EPSG_GUADELOUPE_1951 = 'urn:ogc:def:datum:EPSG::5193';

    /**
     * Guadeloupe 1988
     * Type: Vertical
     * Extent: Guadeloupe - onshore - Basse-Terre and Grande-Terre
     * Mean sea level July 1947 to June 1948 at Pointe-Fouillole (Pointe-à-Pitre harbour). Origin = marker GO-7
     * (formerly AO'-5) with defined height of 2.67m above msl adopted from 1951 value. Guadeloupe 1988 height 0.00m is
     * 0.46m above 1984 sounding datum.
     * Orthometric heights. Replaces Guadeloupe 1951 (datum code 5193).
     */
    public const EPSG_GUADELOUPE_1988 = 'urn:ogc:def:datum:EPSG::5155';

    /**
     * Guam 1963
     * Type: Geodetic
     * Extent: Guam - onshore. Northern Mariana Islands - onshore
     * Fundamental point: Tagcha. Latitude: 13°22'38.49"N, longitude: 144°45'51.56"E (of Greenwich).
     * Replaced by NAD83(HARN).
     */
    public const EPSG_GUAM_1963 = 'urn:ogc:def:datum:EPSG::6675';

    /**
     * Guam Vertical Datum of 1963
     * Type: Vertical
     * Extent: Guam - onshore
     * Mean sea level at Apra harbor, Guam, 1949-1962. Benchmark NO 5 1949 = 0.599m.
     * Replaced by Guam vertical datum of 2004 (datum code 1126).
     */
    public const EPSG_GUAM_VERTICAL_DATUM_OF_1963 = 'urn:ogc:def:datum:EPSG::1122';

    /**
     * Guam Vertical Datum of 2004
     * Type: Vertical
     * Extent: Guam - onshore
     * Mean sea level at Apra harbor, Guam. Benchmark 1630000 TIDAL 4 = 2.170m relative to US National Tidal Datum
     * Epoch 1983-2001. MSL is 0.419m above MLLW and the BM is 2.589m above MLLW.
     * Replaces Guam Vertical Datum of 1963 (datum code 1122).
     */
    public const EPSG_GUAM_VERTICAL_DATUM_OF_2004 = 'urn:ogc:def:datum:EPSG::1126';

    /**
     * Gulshan 303
     * Type: Geodetic
     * Extent: Bangladesh
     * Gulshan garden, Dhaka.
     * Network of more than 140 control points observed and adjusted in 1995 by Japan International Cooperation Agency
     * (JICA).
     */
    public const EPSG_GULSHAN_303 = 'urn:ogc:def:datum:EPSG::6682';

    /**
     * Gunung Segara
     * Type: Geodetic
     * Extent: Indonesia - Kalimantan - onshore east coastal area including Mahakam delta coastal and offshore shelf
     * areas
     * Station P5 (Gunung Segara). Latitude 0°32'12.83"S, longitude 117°08'48.47"E (of Greenwich).
     */
    public const EPSG_GUNUNG_SEGARA = 'urn:ogc:def:datum:EPSG::6613';

    /**
     * Gunung Segara (Jakarta)
     * Type: Geodetic
     * Extent: Indonesia - Kalimantan - onshore east coastal area including Mahakam delta coastal and offshore shelf
     * areas
     * Station P5 (Gunung Segara) 0°32'12.83"S, 117°08'48.47"E (of Greenwich). Longitude 8°20'20.68"E (of Jakarta).
     */
    public const EPSG_GUNUNG_SEGARA_JAKARTA = 'urn:ogc:def:datum:EPSG::6820';

    /**
     * Gusterberg (Ferro)
     * Type: Geodetic
     * Extent: Austria - Upper Austria and Salzburg provinces. Czechia - Bohemia
     * Fundamental point: Gusterberg. Latitude: 48°02'18.47"N, longitude: 31°48'15.05"E (of Ferro).
     */
    public const EPSG_GUSTERBERG_FERRO = 'urn:ogc:def:datum:EPSG::1188';

    /**
     * HS2 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - HS2 phases 1 and 2a railway corridor from London to Birmingham, Lichfield and Crewe
     * Defined through application of the HS2TN02 transformation to ETRS89 as realized through OSNet v2001 CORS.
     * Subsequently realized through application of the HS2TN15 transformation to ETRS89 as realized through OSNet
     * v2009 CORS.
     * Created to support intermediate CRS "HS2-IRF" in the emulation of the HS2P1+14 Snake map projection.
     */
    public const EPSG_HS2_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1264';

    /**
     * HS2 Vertical Reference Frame
     * Type: Vertical
     * Extent: UK - HS2 phases 1 and 2a railway corridor from London to Birmingham, Lichfield and Crewe
     * Equivalent to Ordnance Datum Newlyn as realized through OSNet v2001 and OSGM02.
     * After introduction of OSNet v2009 CORS, OSTN15 and the OSGM15 geoid model, the HS2 VRF is maintained equivalent
     * to OSNet v2001 and OSGM02 through HS2GM15 (code 9304).
     */
    public const EPSG_HS2_VERTICAL_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1265';

    /**
     * HULLEE13 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from the Morley tunnel through Leeds to Hull
     * Defined through the application of the HULLEE13 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS "HULLEE13-IRF" in the emulation of the HULLEE13 Snake map
     * projection.
     */
    public const EPSG_HULLEE13_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1317';

    /**
     * Ha Tien 1960
     * Type: Vertical
     * Extent: Cambodia - mainland onshore; Vietnam - mainland onshore
     * In Vietnam replaced by Hon Dau in 1992.
     */
    public const EPSG_HA_TIEN_1960 = 'urn:ogc:def:datum:EPSG::5125';

    /**
     * Hanoi 1972
     * Type: Geodetic
     * Extent: Vietnam - onshore.
     */
    public const EPSG_HANOI_1972 = 'urn:ogc:def:datum:EPSG::6147';

    /**
     * Hartebeesthoek94
     * Type: Geodetic
     * Extent: Eswatini (Swaziland); Lesotho; South Africa
     * Coincident with ITRF91 at epoch 1994.0 at Hartebeesthoek astronomical observatory near Pretoria.
     * Replaces Cape datum (code 6222).
     */
    public const EPSG_HARTEBEESTHOEK94 = 'urn:ogc:def:datum:EPSG::6148';

    /**
     * Helle 1954
     * Type: Geodetic
     * Extent: Jan Mayen - onshore.
     */
    public const EPSG_HELLE_1954 = 'urn:ogc:def:datum:EPSG::6660';

    /**
     * Helsinki 1943
     * Type: Vertical
     * Extent: Finland - onshore mainland south of approximately 66°N
     * MSL at Helsinki during 1943.
     * Uses orthometric heights. Effect of the land uplift during the 2nd national levelling was not taken into
     * account. Replaced by N60 (datum code 5116).
     */
    public const EPSG_HELSINKI_1943 = 'urn:ogc:def:datum:EPSG::1213';

    /**
     * Helsinki 1960
     * Type: Vertical
     * Extent: Finland - onshore
     * MSL at Helsinki during 1960.
     * Uses orthometric heights. Replaced by N2000 (datum code 1030).
     */
    public const EPSG_HELSINKI_1960 = 'urn:ogc:def:datum:EPSG::5116';

    /**
     * Herat North
     * Type: Geodetic
     * Extent: Afghanistan
     * Fundamental point: Herat North. Latitude: 34°23'09.08"N, longitude: 64°10'58.94"E (of Greenwich).
     */
    public const EPSG_HERAT_NORTH = 'urn:ogc:def:datum:EPSG::6255';

    /**
     * High Water
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The highest water level reached at a place in one tidal cycle. When used on inland (non-tidal) waters it is
     * generally defined as a level which the daily mean water level exceeds less than 5% of the time.
     */
    public const EPSG_HIGH_WATER = 'urn:ogc:def:datum:EPSG::1094';

    /**
     * Higher High Water Large Tide
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average of the highest high waters, one from each of 19 years of observations.
     */
    public const EPSG_HIGHER_HIGH_WATER_LARGE_TIDE = 'urn:ogc:def:datum:EPSG::1084';

    /**
     * Highest Astronomical Tide
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The highest tide level which can be predicted to occur under average meteorological conditions and under any
     * combination of astronomical conditions.
     */
    public const EPSG_HIGHEST_ASTRONOMICAL_TIDE = 'urn:ogc:def:datum:EPSG::1082';

    /**
     * Hito XVIII 1963
     * Type: Geodetic
     * Extent: Chile - Tierra del Fuego, onshore; Argentina - Tierra del Fuego,  Atlantic west of 66°W
     * Chile-Argentina boundary survey.
     * Used in Tierra del Fuego.
     */
    public const EPSG_HITO_XVIII_1963 = 'urn:ogc:def:datum:EPSG::6254';

    /**
     * Hjorsey 1955
     * Type: Geodetic
     * Extent: Iceland - mainland
     * Fundamental point:  Latitude: 64°31'29.26"N, longitude: 22°22'05.84"W (of Greenwich).
     */
    public const EPSG_HJORSEY_1955 = 'urn:ogc:def:datum:EPSG::6658';

    /**
     * Hon Dau 1992
     * Type: Vertical
     * Extent: Vietnam - mainland onshore
     * Replaces Ha Tien in Vietnam.
     */
    public const EPSG_HON_DAU_1992 = 'urn:ogc:def:datum:EPSG::5126';

    /**
     * Hong Kong 1963
     * Type: Geodetic
     * Extent: China - Hong Kong
     * Fundamental point: Trig "Zero", 38.4 feet south along the transit circle of the Kowloon Observatory. Latitude
     * 22°18'12.82"N, longitude 114°10'18.75"E (of Greenwich).
     * Replaced by Hong Kong 1963(67) for military purposes only in 1967. Replaced by Hong Kong 1980.
     */
    public const EPSG_HONG_KONG_1963 = 'urn:ogc:def:datum:EPSG::6738';

    /**
     * Hong Kong 1963(67)
     * Type: Geodetic
     * Extent: China - Hong Kong
     * Fundamental point: Trig "Zero", 38.4 feet south along the transit circle of the Kowloon Observatory. Latitude
     * 22°18'12.82"N, longitude 114°10'18.75"E (of Greenwich).
     * Replaces Hong Kong 1963 for military purposes only in 1967. Replaced by Hong Kong 1980.
     */
    public const EPSG_HONG_KONG_1963_67 = 'urn:ogc:def:datum:EPSG::6739';

    /**
     * Hong Kong 1980
     * Type: Geodetic
     * Extent: China - Hong Kong
     * Fundamental point: Trig "Zero", 38.4 feet south along the transit circle of the Kowloon Observatory. Latitude
     * 22°18'12.82"N, longitude 114°10'18.75"E (of Greenwich).
     * Replaces Hong Kong 1963 and Hong Kong 1963(67).
     */
    public const EPSG_HONG_KONG_1980 = 'urn:ogc:def:datum:EPSG::6611';

    /**
     * Hong Kong Chart Datum
     * Type: Vertical
     * Extent: China - Hong Kong - offshore
     * Approximates to Lowest Astronomic Tide level (LAT).
     * Chart datum is 0.15 metres below Hong Kong Principal Datum (code 5135) and 1.38m below MSL at Quarry Bay.
     */
    public const EPSG_HONG_KONG_CHART_DATUM = 'urn:ogc:def:datum:EPSG::5136';

    /**
     * Hong Kong Geodetic
     * Type: Geodetic
     * Extent: China - Hong Kong
     * ITRF96 at epoch 1998.121
     * Locally sometimes referred to as ITRF96 or WGS 84, these are not strictly correct as it applies only at epoch
     * 1998.121 and ignores subsequent tectonic plate motion.
     */
    public const EPSG_HONG_KONG_GEODETIC = 'urn:ogc:def:datum:EPSG::1209';

    /**
     * Hong Kong Principal Datum
     * Type: Vertical
     * Extent: China - Hong Kong - onshore
     * 1.23m below the mean of 19 years (1965-83) observations of tide levels at North Point, Victoria Harbour.
     */
    public const EPSG_HONG_KONG_PRINCIPAL_DATUM = 'urn:ogc:def:datum:EPSG::5135';

    /**
     * Horta
     * Type: Vertical
     * Extent: Portugal - central Azores - Faial island onshore
     * Mean Sea Level during 1935 at Horta.
     * Orthometric heights.
     */
    public const EPSG_HORTA = 'urn:ogc:def:datum:EPSG::1104';

    /**
     * Hu Tzu Shan 1950
     * Type: Geodetic
     * Extent: Taiwan, Republic of China - onshore - Taiwan Island, Penghu (Pescadores) Islands
     * Fundamental point: Hu Tzu Shan. Latitude: 23°58'32.34"N, longitude: 120°58'25.975"E (of Greenwich).
     */
    public const EPSG_HU_TZU_SHAN_1950 = 'urn:ogc:def:datum:EPSG::6236';

    /**
     * Huahine SAU 2001
     * Type: Vertical
     * Extent: French Polynesia - Society Islands - Huahine
     * Fundamental benchmark: SHOM B3
     * Included as part of NGPF - see datum code 5195.
     */
    public const EPSG_HUAHINE_SAU_2001 = 'urn:ogc:def:datum:EPSG::5200';

    /**
     * Hughes 1980
     * Type: Geodetic
     * Extent: World
     * Centre of the Earth.
     * Used in US Air Force Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave Imager (SSM/I) and
     * Special Sensor Microwave Imager/Sounder (SSMIS) processing software.
     */
    public const EPSG_HUGHES_1980 = 'urn:ogc:def:datum:EPSG::1359';

    /**
     * Hungarian Datum 1909
     * Type: Geodetic
     * Extent: Hungary
     * Fundamental point not given in information source, but presumably Szolohegy which is origin of later HD72.
     * Replaced earlier HD1863 adjustment also on Bessel ellipsoid. Both HD1863 and HD1909 were originally on Ferro
     * Prime Meridian but subsequently converted to Greenwich. Replaced by HD72 (datum code 6237).
     */
    public const EPSG_HUNGARIAN_DATUM_1909 = 'urn:ogc:def:datum:EPSG::1024';

    /**
     * Hungarian Datum 1972
     * Type: Geodetic
     * Extent: Hungary
     * Fundamental point: Szolohegy. Latitude: 47°17'32,6156"N, longitude 19°36'09.9865"E (of Greenwich); geoid
     * height 6.56m.
     * Replaced Hungarian Datum 1909 (EPSG datum code 1024).
     */
    public const EPSG_HUNGARIAN_DATUM_1972 = 'urn:ogc:def:datum:EPSG::6237';

    /**
     * IG05 Intermediate Datum
     * Type: Geodetic
     * Extent: Israel - onshore; Palestine Territory - onshore
     * Defined by transformation from IGD05 at epoch 2004.75.
     */
    public const EPSG_IG05_INTERMEDIATE_DATUM = 'urn:ogc:def:datum:EPSG::1142';

    /**
     * IG05/12 Intermediate Datum
     * Type: Geodetic
     * Extent: Israel - onshore; Palestine Territory - onshore
     * Defined by transformation from IGD05/12 at epoch 2012.00.
     */
    public const EPSG_IG05_12_INTERMEDIATE_DATUM = 'urn:ogc:def:datum:EPSG::1144';

    /**
     * IGC 1962 Arc of the 6th Parallel South
     * Type: Geodetic
     * Extent: The Democratic Republic of the Congo (Zaire) - adjacent to 6th parallel south traverse
     * Coordinates of 3 stations determined with respect to Arc 1950: Mulungu 4°47'39.2325"S, 29°59'37.5864"E;
     * Nyakawembe 4°14'57.3618"S, 29°42'52.8032"E; Kavula 4°35'15.8634"S, 29°41'14.2693"E (all longitude w.r.t.
     * Greenwich).
     */
    public const EPSG_IGC_1962_ARC_OF_THE_6TH_PARALLEL_SOUTH = 'urn:ogc:def:datum:EPSG::6697';

    /**
     * IGN 1962 Kerguelen
     * Type: Geodetic
     * Extent: French Southern Territories - Kerguelen onshore
     * K0 1949.
     */
    public const EPSG_IGN_1962_KERGUELEN = 'urn:ogc:def:datum:EPSG::6698';

    /**
     * IGN 1966
     * Type: Vertical
     * Extent: French Polynesia - Society Islands - Tahiti
     * Fundamental benchmark: RN501
     * Included as part of NGPF - see datum code 5195.
     */
    public const EPSG_IGN_1966 = 'urn:ogc:def:datum:EPSG::5196';

    /**
     * IGN 1988 LS
     * Type: Vertical
     * Extent: Guadeloupe - onshore - Les Saintes
     * Mean sea level 1984 at Terre de Haut. Origin = marker O de -5 with defined height of 1.441m above msl. IGN 1988
     * LS height 0.00m is 0.46m above 1987 sounding datum; this approximately corresponds with msl at Pointe-à-Pitre
     * (see datum code 5155, CRS 5757).
     * Orthometric heights.
     */
    public const EPSG_IGN_1988_LS = 'urn:ogc:def:datum:EPSG::5210';

    /**
     * IGN 1988 MG
     * Type: Vertical
     * Extent: Guadeloupe - onshore - Marie-Galante
     * Mean sea level 1987 at Grand-Bourg. Origin = marker M0-I with defined height of 0.832m above msl. IGN 1988 MG
     * height 0.00m is 0.46m above 1987 sounding datum; this approximately corresponds with msl at Pointe-à-Pitre (see
     * datum code 5155, CRS code 5757).
     * Orthometric heights.
     */
    public const EPSG_IGN_1988_MG = 'urn:ogc:def:datum:EPSG::5211';

    /**
     * IGN 1988 SB
     * Type: Vertical
     * Extent: Guadeloupe - onshore - St Barthelemy island
     * Mean sea level 1988 at port of Gustavia. Origin = marker A.ef-2 with defined height of 0.621m above msl. IGN
     * 1988 SB height 0.00m deduced to be 0.201m above mean sea level at Pointe-à-Pitre.
     * Orthometric heights.
     */
    public const EPSG_IGN_1988_SB = 'urn:ogc:def:datum:EPSG::5213';

    /**
     * IGN 1988 SM
     * Type: Vertical
     * Extent: Guadeloupe - onshore - St Martin island
     * Mean sea level 1949-1950 deduced at Fort Marigot. Origin = marker AS-13 with defined height of 6.990m above msl.
     * IGN 1988 SM height 0.00m deduced to be 0.41m above sounding datum.
     * Orthometric heights.
     */
    public const EPSG_IGN_1988_SM = 'urn:ogc:def:datum:EPSG::5214';

    /**
     * IGN 1992 LD
     * Type: Vertical
     * Extent: Guadeloupe - onshore - La Desirade
     * Mean sea level at Pointe-à-Pitre. Origin = marker A with defined height of 0.792m above msl. IGN 1992 LD height
     * 0.00m is 0.629m above sounding datum at Pointe-à-Pitre.
     * Orthometric heights. Replaced by IGN 2008 LD (datum code 1250).
     */
    public const EPSG_IGN_1992_LD = 'urn:ogc:def:datum:EPSG::5212';

    /**
     * IGN 2008 LD
     * Type: Vertical
     * Extent: Guadeloupe - onshore - La Desirade
     * Mean sea level at Pointe-à-Pitre. Origin = IGN Marker 20A with defined height of 0.50 m above msl of 1987.
     * Orthometric heights. Replaces IGN 1992 LD (datum code 5212).
     */
    public const EPSG_IGN_2008_LD = 'urn:ogc:def:datum:EPSG::1250';

    /**
     * IGN Astro 1960
     * Type: Geodetic
     * Extent: Mauritania - onshore
     * Realised through a set of independent astronomically-positioned points.
     * Observed during 1959-1960. Independent points not connected through a network. Relative accuracy estimated at
     * 50-100m. Replaced by Mauritania 1999 (datum code 6702).
     */
    public const EPSG_IGN_ASTRO_1960 = 'urn:ogc:def:datum:EPSG::6700';

    /**
     * IGN53 Mare
     * Type: Geodetic
     * Extent: New Caledonia - Loyalty Islands - Mare
     * South-east end of the La Roche base.
     */
    public const EPSG_IGN53_MARE = 'urn:ogc:def:datum:EPSG::6641';

    /**
     * IGN56 Lifou
     * Type: Geodetic
     * Extent: New Caledonia - Loyalty Islands - Lifou
     * South end of the Goume base.
     */
    public const EPSG_IGN56_LIFOU = 'urn:ogc:def:datum:EPSG::6633';

    /**
     * IGN63 Hiva Oa
     * Type: Geodetic
     * Extent: French Polynesia - Marquesas Islands - Hiva Oa and Tahuata
     * Fundamental point: Atuona. Latitude: 9°48'27.20"S, longitude: 139°02'15.45"W (of Greenwich).
     * Replaced by RGPF (datum code 6687).
     */
    public const EPSG_IGN63_HIVA_OA = 'urn:ogc:def:datum:EPSG::6689';

    /**
     * IGN72 Grande Terre
     * Type: Geodetic
     * Extent: New Caledonia - Grande Terre
     * North end of Gomen base.
     */
    public const EPSG_IGN72_GRANDE_TERRE = 'urn:ogc:def:datum:EPSG::6634';

    /**
     * IGN72 Nuku Hiva
     * Type: Geodetic
     * Extent: French Polynesia - Marquesas Islands - Nuku Hiva, Ua Huka and Ua Pou
     * Fundamental point: Taiohae. Latitude: 8°55'03.97"S, longitude: 140°05'36.24"W (of Greenwich).
     * Replaced by RGPF (datum code 6687).
     */
    public const EPSG_IGN72_NUKU_HIVA = 'urn:ogc:def:datum:EPSG::6630';

    /**
     * IGS00
     * Type: Dynamic geodetic
     * Extent: World
     * Derived from ITRF2000 at epoch 1998.00 through a subset of 54 stable IGS station coordinates. Preserves the ITRF
     * origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
     * Used for IGS products from GPS week 1143 through GPS week 1252 (2001-12-02 through 2004-01-10). Replaces IGS97,
     * replaced by IGb00. For all practical purposes coincident with ITRF2000.
     */
    public const EPSG_IGS00 = 'urn:ogc:def:datum:EPSG::1245';

    /**
     * IGS05
     * Type: Dynamic geodetic
     * Extent: World
     * Derived from ITRF2005 at epoch 2000.00 through a subset of 139 stable IGS station coordinates. Preserves the
     * ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic
     * techniques.
     * Used for IGS products from GPS week 1400 through GPS week 1631 (2006-11-05 to 2011-04-16). Replaces IGb00,
     * replaced by IGb08. For all practical purposes coincident with ITRF2005.
     */
    public const EPSG_IGS05 = 'urn:ogc:def:datum:EPSG::1247';

    /**
     * IGS08
     * Type: Dynamic geodetic
     * Extent: World
     * Derived from ITRF2008 at epoch 2005.00 through a subset of 232 stable IGS station coordinates. Preserves the
     * ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic
     * techniques.
     * Used for IGS products from GPS week 1632 through GPS week 1708 (2011-04-17 through 2012-10-06). Replaces IGS05.
     * Replaced by IGb08. For all practical purposes coincident with ITRF2008.
     */
    public const EPSG_IGS08 = 'urn:ogc:def:datum:EPSG::1141';

    /**
     * IGS14
     * Type: Dynamic geodetic
     * Extent: World
     * Derived from ITRF2014 at epoch 2010.00 through a subset of 252 stable IGS station coordinates. Preserves the
     * ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic
     * techniques.
     * Used for IGS products from GPS week 1934 (2017-01-29) through GPS week 2105 (2020-05-16). Replaces IGb08,
     * replaced by IGb14. For all practical purposes coincident with ITRF2014.
     */
    public const EPSG_IGS14 = 'urn:ogc:def:datum:EPSG::1191';

    /**
     * IGS20
     * Type: Dynamic geodetic
     * Extent: World
     * A subset of 332 stable, well-performing IGS stations from ITRF2020.
     * Used for IGS products from GPS week 2238 (2022-11-27). Replaces IGb14. Compared to IGb14, IGS20 contains 98 new
     * stations, mostly in previously sparsely covered areas, but with 25 IGb14 sites removed. For all practical
     * purposes coincident with ITRF2020.
     */
    public const EPSG_IGS20 = 'urn:ogc:def:datum:EPSG::1333';

    /**
     * IGS97
     * Type: Dynamic geodetic
     * Extent: World
     * Derived from ITRF97 at epoch 1997.00 through a subset of stable IGS station coordinates. Preserves the ITRF
     * origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
     * Used for IGS products from GPS week 1065 through GPS week 1142 (2000-06-04 to 2001-12-01). Replaced by IGS00.
     * For all practical purposes coincident with ITRF97.
     */
    public const EPSG_IGS97 = 'urn:ogc:def:datum:EPSG::1244';

    /**
     * IGb00
     * Type: Dynamic geodetic
     * Extent: World
     * Derived from ITRF2000 at epoch 1998.00 through a subset of 99 stable IGS station coordinates. Preserves the ITRF
     * origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
     * Used for IGS products from GPS week 1253 through GPS week 1399 (2004-01-11 to 2006-11-04). Replaces IGS00,
     * replaced by IGS05. For all practical purposes coincident with ITRF2000.
     */
    public const EPSG_IGB00 = 'urn:ogc:def:datum:EPSG::1246';

    /**
     * IGb08
     * Type: Dynamic geodetic
     * Extent: World
     * Derived from ITRF2008 at epoch 2005.00 through a subset of 232 stable IGS station coordinates. Preserves the
     * ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic
     * techniques.
     * Used for IGS products from GPS week 1709 through GPS week 1933 (2012-10-07 to 2017-01-28). Replaces IGS08,
     * replaced by IGS14. For all practical purposes coincident with ITRF2008.
     */
    public const EPSG_IGB08 = 'urn:ogc:def:datum:EPSG::1248';

    /**
     * IGb14
     * Type: Dynamic geodetic
     * Extent: World
     * Daily IGS combined operational solutions of GPS weeks 730 to 2092. IGb14 is aligned in origin, scale and
     * orientation to IGS14 via a subset of 233 selected stations. As IGS14 is aligned to ITRF2014, IGb14 is also
     * aligned to ITRF2014.
     * Used for IGS products from GPS week 2106 (2020-05-17). Replaces IGS14. Compared to IGS14, IGb14 benefits from 5
     * more years of input data, a revised discontinuity list and 9 additional stations. For all practical purposes
     * coincident with ITRF2014.
     */
    public const EPSG_IGB14 = 'urn:ogc:def:datum:EPSG::1272';

    /**
     * IRENET95
     * Type: Geodetic
     * Extent: Ireland - onshore. UK - Northern Ireland (Ulster) - onshore
     * ETRS89 stations in Ireland
     * Densification of ETRS89.
     */
    public const EPSG_IRENET95 = 'urn:ogc:def:datum:EPSG::6173';

    /**
     * Ibiza
     * Type: Vertical
     * Extent: Spain - Balearic Islands - Ibiza - onshore
     * Mean Sea Level at Ibiza harbour between January 2003 and December 2005.
     * Orthometric heights.
     */
    public const EPSG_IBIZA = 'urn:ogc:def:datum:EPSG::1277';

    /**
     * Indian 1954
     * Type: Geodetic
     * Extent: Myanmar (Burma) - onshore; Thailand - onshore
     * Extension of Kalianpur 1937 over Myanmar and Thailand.
     */
    public const EPSG_INDIAN_1954 = 'urn:ogc:def:datum:EPSG::6239';

    /**
     * Indian 1960
     * Type: Geodetic
     * Extent: Cambodia - onshore; Vietnam Cuu Long basin
     * DMA extension over IndoChina of the Indian 1954 network adjusted  to better fit local geoid.
     * Also known as Indian (DMA Reduced).
     */
    public const EPSG_INDIAN_1960 = 'urn:ogc:def:datum:EPSG::6131';

    /**
     * Indian 1975
     * Type: Geodetic
     * Extent: Thailand - onshore plus offshore Gulf of Thailand
     * Fundamental point: Khau Sakaerang.
     */
    public const EPSG_INDIAN_1975 = 'urn:ogc:def:datum:EPSG::6240';

    /**
     * Indian Spring Low Water
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The level below MSL equal to the sum of the amplitudes of the harmonic constituents M2, S2, K1 and O1. It
     * approximates mean lower low water spring tides (MLLWS).
     */
    public const EPSG_INDIAN_SPRING_LOW_WATER = 'urn:ogc:def:datum:EPSG::1085';

    /**
     * Indonesian Datum 1974
     * Type: Geodetic
     * Extent: Indonesia - onshore
     * Fundamental point: Padang. Latitude: 0°56'38.414"S, longitude: 100°22' 8.804"E (of Greenwich). Ellipsoidal
     * height 3.190m, gravity-related height 14.0m above mean sea level.
     * Replaced by DGN95.
     */
    public const EPSG_INDONESIAN_DATUM_1974 = 'urn:ogc:def:datum:EPSG::6238';

    /**
     * Indonesian Geoid 2020 version 1
     * Type: Vertical
     * Extent: Indonesia
     * Defined by INAGeoid2020 gravimetric geoid model v1 applied to SRGI2013.
     * Uses gravity data observed to 2019 fitted to control points on Java and Bali.
     */
    public const EPSG_INDONESIAN_GEOID_2020_VERSION_1 = 'urn:ogc:def:datum:EPSG::1294';

    /**
     * Indonesian Geoid 2020 version 2
     * Type: Vertical
     * Extent: Indonesia
     * Defined by INAGeoid2020 gravimetric geoid model v2 applied to SRGI2013.
     * Uses gravity data observed to 2021 fitted to tide gauge benchmarks across Indonesia.
     */
    public const EPSG_INDONESIAN_GEOID_2020_VERSION_2 = 'urn:ogc:def:datum:EPSG::1328';

    /**
     * Instantaneous Water Level
     * Type: Vertical
     * Extent: World
     * Instantaneous water level uncorrected for tide.
     * Not specific to any location or epoch.
     */
    public const EPSG_INSTANTANEOUS_WATER_LEVEL = 'urn:ogc:def:datum:EPSG::5113';

    /**
     * Institut Geographique du Congo Belge 1955
     * Type: Geodetic
     * Extent: The Democratic Republic of the Congo (Zaire) - Lower Congo (Bas Congo)
     * Fundamental point: Yella east base. Latitude: 6°00'53.139"S, longitude: 12°58'29.287"E (of Greenwich).
     * Replaced by IGC 1962 Arc of the 6th Parallel South, except for oil industry activities.
     */
    public const EPSG_INSTITUT_GEOGRAPHIQUE_DU_CONGO_BELGE_1955 = 'urn:ogc:def:datum:EPSG::6701';

    /**
     * International Great Lakes Datum 1955
     * Type: Vertical
     * Extent: Canada and USA - Great Lakes basin and St Lawrence Seaway
     * Mean water level 1941-1956 at Pointe-au-Père (Father's Point), Quebec. Benchmark 1248-G = 3.794m.
     * Dynamic heights. Adopted in 1962. Replaced by IGLD 1985 in January 1992.
     */
    public const EPSG_INTERNATIONAL_GREAT_LAKES_DATUM_1955 = 'urn:ogc:def:datum:EPSG::5204';

    /**
     * International Great Lakes Datum 1985
     * Type: Vertical
     * Extent: Canada and USA - Great Lakes basin and St Lawrence Seaway
     * Mean water level 1970-1983 at Pointe-au-Père (Father's Point) and 1984-1988 at Rimouski, Quebec. Benchmark
     * 1250-G = 6.273m.
     * Dynamic heights. Replaces IGLD 1955 from January 1992.
     */
    public const EPSG_INTERNATIONAL_GREAT_LAKES_DATUM_1985 = 'urn:ogc:def:datum:EPSG::5205';

    /**
     * International Terrestrial Reference Frame 1988
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of
     * 3-dimensional Cartesian station coordinates (SCS).
     * Realization of the IERS Terrestrial Reference System (ITRS) at epoch 1988.0. Replaced by ITRF89 (code 6648).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_1988 = 'urn:ogc:def:datum:EPSG::6647';

    /**
     * International Terrestrial Reference Frame 1989
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of
     * 3-dimensional Cartesian station coordinates (SCS) for epoch 1988.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from April 1991. Replaces ITRF88 (code 6647).
     * Replaced by ITRF90 (code 6649).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_1989 = 'urn:ogc:def:datum:EPSG::6648';

    /**
     * International Terrestrial Reference Frame 1990
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of
     * 3-dimensional Cartesian station coordinates (SCS) for epoch 1988.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from December 1991. Replaces ITRF89 (code 6648).
     * Replaced by ITRF91 (code 6650).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_1990 = 'urn:ogc:def:datum:EPSG::6649';

    /**
     * International Terrestrial Reference Frame 1991
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of
     * 3-dimensional Cartesian station coordinates (SCS) for epoch 1988.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from October 1992. Replaces ITRF90 (code 6649).
     * Replaced by ITRF92 (code 6651).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_1991 = 'urn:ogc:def:datum:EPSG::6650';

    /**
     * International Terrestrial Reference Frame 1992
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 287
     * 3-dimensional Cartesian station coordinates (SCS) for epoch 1988.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from October 1993. Replaces ITRF91 (code 6650).
     * Replaced by ITRF93 (code 6652).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_1992 = 'urn:ogc:def:datum:EPSG::6651';

    /**
     * International Terrestrial Reference Frame 1993
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of
     * 3-dimensional Cartesian station coordinates (SCS) for epoch 1993.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from October 1994. Replaces ITRF92 (code 6651).
     * Replaced by ITRF94 (code 6653).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_1993 = 'urn:ogc:def:datum:EPSG::6652';

    /**
     * International Terrestrial Reference Frame 1994
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of
     * 3-dimensional Cartesian station coordinates (SCS) for epoch 1993.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from March 1996. Replaces ITRF93 (code 6652).
     * Replaced by ITRF96 (code 6654).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_1994 = 'urn:ogc:def:datum:EPSG::6653';

    /**
     * International Terrestrial Reference Frame 1996
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of
     * 3-dimensional Cartesian station coordinates (SCS) for epoch 1997.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from May 1998. Replaces ITRF94 (code 6653). Replaced
     * by ITRF97 (code 6655).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_1996 = 'urn:ogc:def:datum:EPSG::6654';

    /**
     * International Terrestrial Reference Frame 1997
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of
     * 3-dimensional Cartesian station coordinates (SCS) for epoch 1997.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from May 1999. Replaces ITRF96 (code 6654). Replaced
     * by ITRF2000 (code 6656).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_1997 = 'urn:ogc:def:datum:EPSG::6655';

    /**
     * International Terrestrial Reference Frame 2000
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of
     * 3-dimensional Cartesian station coordinates (SCS) for epoch 1997.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from 2004. Replaces ITRF97 (code 6655). Replaced by
     * ITRF2005 (code 6896).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_2000 = 'urn:ogc:def:datum:EPSG::6656';

    /**
     * International Terrestrial Reference Frame 2005
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre, originally orientated to the BIH Terrestrial System at epoch 1984.0 then adjusted to ensure
     * zero net rotation to earth's overall tectonic motion. Defined by time series of Cartesian station coordinates
     * for epoch 2000.0.
     * Realization of the IERS Terrestrial Reference System (ITRS) from September 2007. Replaces ITRF2000 (code 6656).
     * Replaced by ITRF2008 (datum code 1061).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_2005 = 'urn:ogc:def:datum:EPSG::6896';

    /**
     * International Terrestrial Reference Frame 2008
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre. The ITRF2008 origin is defined in such a way that there are null translation parameters at
     * epoch 2005.0 and null translation rates between the ITRF2008 and the ILRS SLR time series.
     * Realization of the IERS Terrestrial Reference System (ITRS) from 2012. Replaces ITRF2005 (code 6896).
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_2008 = 'urn:ogc:def:datum:EPSG::1061';

    /**
     * International Terrestrial Reference Frame 2014
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre. Origin = ILRS SLR long-term solution at epoch 2010.0. Zero scale and scale rate between
     * ITRF2014 and the average of VLBI and SLR scales/rates. Orientation = ITRF2008@ 2010.0 with zero rotation rates
     * between the ITRF2014 and ITRF2008.
     * Realization of the IERS Terrestrial Reference System (ITRS). Replaces ITRF2008 (datum code 1061) from January
     * 2016. Replaced by ITRF2020 (datum code 1322) from April 2022.
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_2014 = 'urn:ogc:def:datum:EPSG::1165';

    /**
     * International Terrestrial Reference Frame 2020
     * Type: Dynamic geodetic
     * Extent: World
     * Origin at geocentre. Origin = ILRS SLR long-term solution at epoch 2015.0. Zero scale and scale rate between
     * ITRF2020 and the average of VLBI and SLR scales/rates. Orientation = ITRF2014@ 2015.0 with zero rotation rates
     * between the ITRF2020 and ITRF2014.
     * Realization of the IERS Terrestrial Reference System (ITRS). Replaces ITRF2014 (datum code 1165) from April
     * 2022.
     */
    public const EPSG_INTERNATIONAL_TERRESTRIAL_REFERENCE_FRAME_2020 = 'urn:ogc:def:datum:EPSG::1322';

    /**
     * Iraq-Kuwait Boundary Datum 1992
     * Type: Geodetic
     * Extent: Iraq - Kuwait boundary
     * Four stations established between September and December 1991 determined by GPS and Doppler observations.
     */
    public const EPSG_IRAQ_KUWAIT_BOUNDARY_DATUM_1992 = 'urn:ogc:def:datum:EPSG::6667';

    /**
     * Iraqi Geospatial Reference System
     * Type: Geodetic
     * Extent: Iraq
     * ITRF2000 at epoch 1997.0.
     */
    public const EPSG_IRAQI_GEOSPATIAL_REFERENCE_SYSTEM = 'urn:ogc:def:datum:EPSG::1029';

    /**
     * Islands Net 1993
     * Type: Geodetic
     * Extent: Iceland
     * ITRF93 at epoch 1993.6.
     * Replaced by ISN2004 (datum code 1060).
     */
    public const EPSG_ISLANDS_NET_1993 = 'urn:ogc:def:datum:EPSG::6659';

    /**
     * Islands Net 2004
     * Type: Geodetic
     * Extent: Iceland
     * ITRF2000 at epoch 2004.6.
     * Replaces ISN93 (datum code 6659). Replaced by ISN2016 (datum code 1087).
     */
    public const EPSG_ISLANDS_NET_2004 = 'urn:ogc:def:datum:EPSG::1060';

    /**
     * Islands Net 2016
     * Type: Geodetic
     * Extent: Iceland
     * ITRF2014 at epoch 2016.5.
     * Replaces ISN2004 from September 2017.
     */
    public const EPSG_ISLANDS_NET_2016 = 'urn:ogc:def:datum:EPSG::1187';

    /**
     * Israel 1993
     * Type: Geodetic
     * Extent: Israel - onshore; Palestine Territory - onshore
     * Fundamental point:  Latitude: 31°44'03.817"N, longitude: 35°12'16.261"E (of Greenwich).
     * Replaces Palestine 1923 (datum code 6281). Replaced by IGD05 (datum code 1143).
     */
    public const EPSG_ISRAEL_1993 = 'urn:ogc:def:datum:EPSG::6141';

    /**
     * Israeli Geodetic Datum 2005
     * Type: Geodetic
     * Extent: Israel
     * Defined by coordinates of 13 Active Positioning Network (APN) stations in ITRF2000 at epoch 2004.75. A further
     * five APN stations were added in 2006.
     * Replaces Israel 1993 (datum code 6141). Replaced by IGD05/12 (datum code 1115).
     */
    public const EPSG_ISRAELI_GEODETIC_DATUM_2005 = 'urn:ogc:def:datum:EPSG::1114';

    /**
     * Israeli Geodetic Datum 2005(2012)
     * Type: Geodetic
     * Extent: Israel
     * Datum updated in 2012 with four APN stations removed from definition. Coordinate epoch remains ITRF2000 at epoch
     * 2004.75.
     * Replaces IGD05 (datum code 1114).
     */
    public const EPSG_ISRAELI_GEODETIC_DATUM_2005_2012 = 'urn:ogc:def:datum:EPSG::1115';

    /**
     * Istituto Geografico Militaire 1995
     * Type: Geodetic
     * Extent: Italy; San Marino, Vatican City State
     * Densification of ETRF89 in Italy. Network of 1296 points observed 1992-1995 adjusted in 1996 constrained to 9
     * ETRF89 points at epoch 1989.0. By April 2021 the framework was composed of 3104 points of the fundamental
     * network and 3819 densification points.
     * Replaced by RDN2008 (datum code 1132) from 2011-11-10.
     */
    public const EPSG_ISTITUTO_GEOGRAFICO_MILITAIRE_1995 = 'urn:ogc:def:datum:EPSG::6670';

    /**
     * Iwo Jima 1945
     * Type: Geodetic
     * Extent: Japan - Iwo Jima island
     * Fundamental point: Beacon "E".
     */
    public const EPSG_IWO_JIMA_1945 = 'urn:ogc:def:datum:EPSG::6709';

    /**
     * Jamaica 1875
     * Type: Geodetic
     * Extent: Jamaica - onshore
     * Fundamental point: Fort Charles Flagstaff. Latitude: 17°55'55.800"N, longitude: 76°56'37.260"W (of Greenwich).
     */
    public const EPSG_JAMAICA_1875 = 'urn:ogc:def:datum:EPSG::6241';

    /**
     * Jamaica 1969
     * Type: Geodetic
     * Extent: Jamaica - onshore
     * Fundamental point: Fort Charles Flagstaff. Latitude: 17°55'55.800"N, longitude: 76°56'37.260"W (of Greenwich).
     */
    public const EPSG_JAMAICA_1969 = 'urn:ogc:def:datum:EPSG::6242';

    /**
     * Jamaica 2001
     * Type: Geodetic
     * Extent: Jamaica. Includes Morant Cays and Pedro Cays
     * Aligned to WGS 84.
     */
    public const EPSG_JAMAICA_2001 = 'urn:ogc:def:datum:EPSG::6758';

    /**
     * Jamestown 1971
     * Type: Vertical
     * Extent: St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore
     * MSL at Jamestown 1971 defined through elevation of triangulation station Astro DOS 71/4 Ladder Hill Fort being
     * 267.858 metres above MSL.
     */
    public const EPSG_JAMESTOWN_1971 = 'urn:ogc:def:datum:EPSG::1175';

    /**
     * Japanese Geodetic Datum 2000
     * Type: Geodetic
     * Extent: Japan
     * ITRF94 at epoch 1997.0. Fundamental point: Tokyo-Taisho, latitude: 35°39'29.1572"N, longitude:
     * 139°44'28.8759"E (of Greenwich).
     * Instigated under amendment to the Japanese Surveying Law with effect from April 2002. Replaces Tokyo datum (code
     * 6301). Replaced by JGD2011 (datum code 1128) with effect from 21st October 2011.
     */
    public const EPSG_JAPANESE_GEODETIC_DATUM_2000 = 'urn:ogc:def:datum:EPSG::6612';

    /**
     * Japanese Geodetic Datum 2000 (vertical)
     * Type: Vertical
     * Extent: Japan - onshore mainland - Hokkaido, Honshu, Shikoku, Kyushu
     * 24.4140 metres above mean sea level Tokyo Bay.
     * Orthometric heights. Replaces JSLD69 and JSLD72 with effect from April 2002. Replaced by JGD2011 (vertical)
     * (datum code 1131) with effect from 21st October 2011.
     */
    public const EPSG_JAPANESE_GEODETIC_DATUM_2000_VERTICAL = 'urn:ogc:def:datum:EPSG::1130';

    /**
     * Japanese Geodetic Datum 2011
     * Type: Geodetic
     * Extent: Japan
     * ITRF94 at epoch 1997.0 except for northern Honshu area impacted by 2011 Tohoku earthquake which is ITRF2008 at
     * epoch 2011.395. Fundamental point: Tokyo-Taisho, latitude: 35°39'29.1572"N, longitude: 139°44'28.8869"E (of
     * Greenwich).
     * Instigated under amendment to the Japanese Surveying Law with effect from 21st October 2011. Replaces JGD2000
     * (datum code 6612).
     */
    public const EPSG_JAPANESE_GEODETIC_DATUM_2011 = 'urn:ogc:def:datum:EPSG::1128';

    /**
     * Japanese Geodetic Datum 2011 (vertical)
     * Type: Vertical
     * Extent: Japan - onshore mainland - Hokkaido, Honshu, Shikoku, Kyushu
     * 24.3900 metres above mean sea level Tokyo Bay.
     * Orthometric heights. Replaces JGD2000 (vertical) (datum code 1130) with effect from 21st October 2011.
     */
    public const EPSG_JAPANESE_GEODETIC_DATUM_2011_VERTICAL = 'urn:ogc:def:datum:EPSG::1131';

    /**
     * Japanese Standard Levelling Datum 1969
     * Type: Vertical
     * Extent: Japan - onshore mainland - Honshu, Shikoku, Kyushu
     * 24.4140 metres above mean sea level Tokyo Bay.
     * Normal-orthometric heights. Replaces JSLD49. Replaced by JGD2000 (vertical) (datum code 1130) from April 2002.
     */
    public const EPSG_JAPANESE_STANDARD_LEVELLING_DATUM_1969 = 'urn:ogc:def:datum:EPSG::5122';

    /**
     * Japanese Standard Levelling Datum 1972
     * Type: Vertical
     * Extent: Japan - onshore mainland - Hokkaido
     * Mean sea level Oshoro 1963-72.
     * Normal-orthometric heights. Replaced by JGD2000 (vertical) (datum code 1130) with effect from April 2002.
     */
    public const EPSG_JAPANESE_STANDARD_LEVELLING_DATUM_1972 = 'urn:ogc:def:datum:EPSG::1129';

    /**
     * Johnston Island 1961
     * Type: Geodetic
     * Extent: United States Minor Outlying Islands - Johnston Island.
     */
    public const EPSG_JOHNSTON_ISLAND_1961 = 'urn:ogc:def:datum:EPSG::6725';

    /**
     * Jouik 1961
     * Type: Geodetic
     * Extent: Mauritania - coastal area north of Cape Timiris
     * Replaced by Mauritania 1999 (datum code 6702).
     */
    public const EPSG_JOUIK_1961 = 'urn:ogc:def:datum:EPSG::6679';

    /**
     * KOC Construction Datum
     * Type: Vertical
     * Extent: Kuwait - onshore
     * Approximately 1.52m below MSL. Created for the construction of the Mina al Ahmadi refinery.
     */
    public const EPSG_KOC_CONSTRUCTION_DATUM = 'urn:ogc:def:datum:EPSG::5188';

    /**
     * KOC Well Datum
     * Type: Vertical
     * Extent: Kuwait - onshore
     * Approximately 3.22m above MSL.
     */
    public const EPSG_KOC_WELL_DATUM = 'urn:ogc:def:datum:EPSG::5187';

    /**
     * Kalianpur 1880
     * Type: Geodetic
     * Extent: Bangladesh - onshore; India - mainland onshore; Myanmar (Burma) - onshore; Pakistan - onshore
     * Fundamental point: Kalianpur. Latitude: 24°07'11.260"N, longitude: 77°39'17.570"E (of Greenwich).
     * Includes 1916 extension into Burma (Myanmar). Replaced by 1937 adjustment.
     */
    public const EPSG_KALIANPUR_1880 = 'urn:ogc:def:datum:EPSG::6243';

    /**
     * Kalianpur 1937
     * Type: Geodetic
     * Extent: Bangladesh - onshore; India - mainland onshore; Myanmar - onshore and Moattama area offshore; Pakistan -
     * onshore
     * Fundamental point: Kalianpur. Latitude: 24° 07'11.260"N, longitude: 77°39'17.570"E (of Greenwich).
     * Replaces 1880 adjustment except for topographic mapping. Replaced in Bangladesh and Pakistan by 1962 metrication
     * conversion and in India by 1975 metrication conversion.
     */
    public const EPSG_KALIANPUR_1937 = 'urn:ogc:def:datum:EPSG::6144';

    /**
     * Kalianpur 1962
     * Type: Geodetic
     * Extent: Pakistan
     * Fundamental point: Kalianpur. Latitude: 24° 07'11.260"N, longitude: 77°39'17.570"E (of Greenwich).
     * 1937 adjustment rescaled by ratio metric conversions of Indian foot (1937) to Indian foot (1962).
     */
    public const EPSG_KALIANPUR_1962 = 'urn:ogc:def:datum:EPSG::6145';

    /**
     * Kalianpur 1975
     * Type: Geodetic
     * Extent: India - mainland onshore
     * Fundamental point: Kalianpur. Latitude: 24° 07'11.260"N, longitude: 77°39'17.570"E (of Greenwich).
     * 1937 adjustment rescaled by ratio metric conversions of Indian foot (1937) to Indian foot (1975).
     */
    public const EPSG_KALIANPUR_1975 = 'urn:ogc:def:datum:EPSG::6146';

    /**
     * Kandawala
     * Type: Geodetic
     * Extent: Sri Lanka - onshore
     * Fundamental point: Kandawala. Latitude: 7°14'06.838"N, longitude: 79°52'36.670"E.
     */
    public const EPSG_KANDAWALA = 'urn:ogc:def:datum:EPSG::6244';

    /**
     * Karbala 1979
     * Type: Geodetic
     * Extent: Iraq - onshore
     * Fundamental point: Karbala. Latitude: 32°34'14.4941"N, longitude: 44°00'49.6379"E.
     * National geodetic network established by Polservice consortium.
     */
    public const EPSG_KARBALA_1979 = 'urn:ogc:def:datum:EPSG::6743';

    /**
     * Kartastokoordinaattijarjestelma (1966)
     * Type: Geodetic
     * Extent: Finland - onshore
     * Adjustment with fundamental point SF31 based on ED50 transformed to best fit the older VVJ adjustment.
     * Adopted in 1970.
     */
    public const EPSG_KARTASTOKOORDINAATTIJARJESTELMA_1966 = 'urn:ogc:def:datum:EPSG::6123';

    /**
     * Kasai 1953
     * Type: Geodetic
     * Extent: The Democratic Republic of the Congo (Zaire) - Kasai - south of 5°S and east of 21°30'E
     * Two stations of the Katanga triangulation with ellipsoid change applied: Kabila, latitude 6°58'34.023"S,
     * longitude 23°50'24.028"E (of Greenwich); and Gandajika NW base, latitude 6°45'01.057"S, longitude
     * 23°57'03.038"E (of Greenwich).
     * Replaced by IGC 1962 Arc of the 6th Parallel South.
     */
    public const EPSG_KASAI_1953 = 'urn:ogc:def:datum:EPSG::6696';

    /**
     * Katanga 1955
     * Type: Geodetic
     * Extent: The Democratic Republic of the Congo (Zaire) - Katanga
     * Fundamental point: Tshinsenda A. Latitude: 12°30'31.568"S, longitude: 28°01'02.971"E (of Greenwich).
     * Replaces earlier adjustments.
     */
    public const EPSG_KATANGA_1955 = 'urn:ogc:def:datum:EPSG::6695';

    /**
     * Kertau (RSO)
     * Type: Geodetic
     * Extent: Malaysia - West Malaysia; Singapore
     * Adopts metric conversion of 0.914398 metres per yard exactly. This is a truncation of the Sears 1922 ratio.
     */
    public const EPSG_KERTAU_RSO = 'urn:ogc:def:datum:EPSG::6751';

    /**
     * Kertau 1968
     * Type: Geodetic
     * Extent: Malaysia - West Malaysia east coast; Singapore
     * Fundamental point: Kertau. Latitude: 3°27'50.710"N, longitude: 102°37'24.550"E (of Greenwich).
     * Replaces MRT48 and earlier adjustments. Adopts metric conversion of 39.370113 inches per metre. Not used for
     * 1969 metrication of RSO grid - see Kertau (RSO) (code 6751).
     */
    public const EPSG_KERTAU_1968 = 'urn:ogc:def:datum:EPSG::6245';

    /**
     * Kingdom of Saudi Arabia Geodetic Reference Frame 2017
     * Type: Geodetic
     * Extent: Saudi Arabia
     * ITRF2014 at epoch 2017.00.
     * Realized by 333 GNSS stations in Saudi Arabia aligned to ITRF2014 through core network of 46 stations adjusted
     * to 15 IGS stations.
     */
    public const EPSG_KINGDOM_OF_SAUDI_ARABIA_GEODETIC_REFERENCE_FRAME_2017 = 'urn:ogc:def:datum:EPSG::1268';

    /**
     * Kingdom of Saudi Arabia Vertical Reference Frame Jeddah 2014
     * Type: Vertical
     * Extent: Saudi Arabia - onshore
     * Jeddah tide gauge bench mark TGBM-B height of 1.7446m at 2014.75.
     */
    public const EPSG_KINGDOM_OF_SAUDI_ARABIA_VERTICAL_REFERENCE_FRAME_JEDDAH_2014 = 'urn:ogc:def:datum:EPSG::1269';

    /**
     * Kiunga
     * Type: Vertical
     * Extent: Papua New Guinea - onshore south of 5°S and west of 144°E
     * PSM 9465 at Kiunga Airport. Propagated through bilinear interpolation of EGM2008 geoid model (transformation
     * code 3858) reduced to PSM 9465 by offset of -3.0m.
     */
    public const EPSG_KIUNGA = 'urn:ogc:def:datum:EPSG::1151';

    /**
     * Korean Datum 1985
     * Type: Geodetic
     * Extent: Republic of Korea (South Korea) - onshore
     * Fundamental point: Suwon. Latitude 37°16'31.9034"N, longitude 127°03'05.1451"E of Greenwich. This is
     * consistent with the Tokyo 1918 datum latitude and longitude.
     * Replaces Tokyo 1918 (datum code 6301). Replaced by KGD2002 (datum code 6737).
     */
    public const EPSG_KOREAN_DATUM_1985 = 'urn:ogc:def:datum:EPSG::6162';

    /**
     * Korean Datum 1995
     * Type: Geodetic
     * Extent: Republic of Korea (South Korea) - onshore.
     */
    public const EPSG_KOREAN_DATUM_1995 = 'urn:ogc:def:datum:EPSG::6166';

    /**
     * Korean Geodetic Datum 2002
     * Type: Geodetic
     * Extent: Republic of Korea (South Korea)
     * ITRF2000 at epoch 2002.0.
     * KGD2002 is geocentric.
     */
    public const EPSG_KOREAN_GEODETIC_DATUM_2002 = 'urn:ogc:def:datum:EPSG::6737';

    /**
     * Korean Vertical Datum 1964
     * Type: Vertical
     * Extent: Republic of Korea (South Korea) - onshore
     * MSL 1913-1916 at Incheon Bay for mainland. For far offshore islands the MSL is determined through a local tide
     * gauge.
     */
    public const EPSG_KOREAN_VERTICAL_DATUM_1964 = 'urn:ogc:def:datum:EPSG::1049';

    /**
     * Kosovo Reference System 2001
     * Type: Geodetic
     * Extent: Kosovo
     * Densification of ETRF97 in Kosovo at epoch 2001.25.
     * First order network of 32 stations connected to 8 EUREF Permanant Network (EPN) stations observed march-April
     * 2001. Densified in 2012.
     */
    public const EPSG_KOSOVO_REFERENCE_SYSTEM_2001 = 'urn:ogc:def:datum:EPSG::1251';

    /**
     * Kousseri
     * Type: Geodetic
     * Extent: Cameroon - N'Djamena area
     * IGN astronomical station Dabanga; 11°55'05.9"N  14°38'40.8"E (of Greenwich).
     */
    public const EPSG_KOUSSERI = 'urn:ogc:def:datum:EPSG::6198';

    /**
     * Kumul 34
     * Type: Vertical
     * Extent: Papua New Guinea - Papuan fold and thrust belt
     * Kumul Platform Station 34. Propagated through bilinear interpolation of EGM96 geoid model (transformation code
     * 10084) reduced to Kumul 34 by offset of -0.87m.
     */
    public const EPSG_KUMUL_34 = 'urn:ogc:def:datum:EPSG::1150';

    /**
     * Kusaie 1951
     * Type: Geodetic
     * Extent: Federated States of Micronesia - Kosrae (Kusaie).
     */
    public const EPSG_KUSAIE_1951 = 'urn:ogc:def:datum:EPSG::6735';

    /**
     * Kuwait Oil Company
     * Type: Geodetic
     * Extent: Kuwait - onshore
     * Fundamental point: K28.  Latitude: 29°03'42.348"N, longitude: 48°08'42.558"E (of Greenwich).
     */
    public const EPSG_KUWAIT_OIL_COMPANY = 'urn:ogc:def:datum:EPSG::6246';

    /**
     * Kuwait PWD
     * Type: Vertical
     * Extent: Kuwait - onshore
     * Mean Low Low Water (MLLW) at Kuwait City.
     * Approximately 1.03m below MSL.
     */
    public const EPSG_KUWAIT_PWD = 'urn:ogc:def:datum:EPSG::5186';

    /**
     * Kuwait Utility
     * Type: Geodetic
     * Extent: Kuwait - Kuwait City.
     */
    public const EPSG_KUWAIT_UTILITY = 'urn:ogc:def:datum:EPSG::6319';

    /**
     * Kyrgyzstan Geodetic Datum 2006
     * Type: Geodetic
     * Extent: Kyrgyzstan
     * 6 stations of the Kyrgyzstan zero-order network tied to ITRF2005 at epoch 2006.70.
     * The accuracy in the connection to ITRF2005 is estimated to be 5 mm in horizontal and 10-20 mm in height (95%
     * confidence).
     */
    public const EPSG_KYRGYZSTAN_GEODETIC_DATUM_2006 = 'urn:ogc:def:datum:EPSG::1160';

    /**
     * La Canoa
     * Type: Geodetic
     * Extent: Venezuela - onshore
     * Fundamental point: La Canoa. Latitude: 8°34'17.170"N, longitude: 63°51'34.880"W (of Greenwich).
     * Origin and network incorporated within PSAD56 (datum code 6248).
     */
    public const EPSG_LA_CANOA = 'urn:ogc:def:datum:EPSG::6247';

    /**
     * La Gomera
     * Type: Vertical
     * Extent: Spain - Canary Islands - La Gomera onshore
     * Mean Sea Level at San Sebastian de la Gomera harbour.
     * Orthometric heights.
     */
    public const EPSG_LA_GOMERA = 'urn:ogc:def:datum:EPSG::1282';

    /**
     * La Palma
     * Type: Vertical
     * Extent: Spain - Canary Islands - La Palma onshore
     * Mean Sea Level at Santa Cruz de la Palma harbour in 1997.
     * Orthometric heights.
     */
    public const EPSG_LA_PALMA = 'urn:ogc:def:datum:EPSG::1283';

    /**
     * Lagos 1955
     * Type: Vertical
     * Extent: Nigeria - onshore
     * Mean sea level at Lagos, 1912-1928.
     */
    public const EPSG_LAGOS_1955 = 'urn:ogc:def:datum:EPSG::5194';

    /**
     * Lake
     * Type: Geodetic
     * Extent: Venezuela - Lake Maracaibo area,  in lake
     * Fundamental point: Maracaibo Cathedral. Latitude: 10°38'34.678"N, longitude: 71°36'20.224"W (of Greenwich).
     */
    public const EPSG_LAKE = 'urn:ogc:def:datum:EPSG::6249';

    /**
     * Landeshohennetz 1995
     * Type: Vertical
     * Extent: Liechtenstein; Switzerland
     * Origin at Repere Pierre du Niton (RPN) defined as 373.6 metres above msl. This value derived from msl at
     * Marseille in 1897 through the French Lallemand network.
     * Orthometric heights. For scientific purposes only, replaces LN02.
     */
    public const EPSG_LANDESHOHENNETZ_1995 = 'urn:ogc:def:datum:EPSG::5128';

    /**
     * Landesnivellement 1902
     * Type: Vertical
     * Extent: Liechtenstein; Switzerland
     * Origin at Repere Pierre du Niton (RPN) defined as 373.6 metres above msl. This value derived from msl at
     * Marseille in 1897 through the French Lallemand network.
     * Levelling observations not corrected for gravity field. For scientific purposes, replaced by LHHN95.
     */
    public const EPSG_LANDESNIVELLEMENT_1902 = 'urn:ogc:def:datum:EPSG::5127';

    /**
     * Landshaedarkerfi Islands 2004
     * Type: Vertical
     * Extent: Iceland - onshore
     * Adjustment is referenced to mean sea level at Reykjavík epoch 2004.6.
     */
    public const EPSG_LANDSHAEDARKERFI_ISLANDS_2004 = 'urn:ogc:def:datum:EPSG::1190';

    /**
     * Lanzarote
     * Type: Vertical
     * Extent: Spain - Canary Islands - Lanzarote onshore
     * Mean Sea Level at Naos harbour, Arrecife, between 1994 and 1995.
     * Orthometric heights.
     */
    public const EPSG_LANZAROTE = 'urn:ogc:def:datum:EPSG::1278';

    /**
     * Lao 1993
     * Type: Geodetic
     * Extent: Laos
     * Fundamental point: Lao 1982 coordinates of Pakxa pillar. Latitude: 18°23'57.0056"N, longitude:
     * 103°38'41.8020"E (of Greenwich). Orientation parallel with WGS 84.
     * Replaces Vientiane 1982. Replaced by Lao 1997.
     */
    public const EPSG_LAO_1993 = 'urn:ogc:def:datum:EPSG::6677';

    /**
     * Lao National Datum 1997
     * Type: Geodetic
     * Extent: Laos
     * Fundamental point: Vientiane (Nongteng) Astro Pillar. Latitude: 18°01'31.3480"N, longitude: 102°30'57.1376"E
     * (of Greenwich).
     * Replaces Lao 1993.
     */
    public const EPSG_LAO_NATIONAL_DATUM_1997 = 'urn:ogc:def:datum:EPSG::6678';

    /**
     * Latvian Height System 2000
     * Type: Vertical
     * Extent: Latvia - onshore
     * Latvian realisation of EVRF2007. Observed from 2000-2010 and reduced to epoch 2000.5 using empirical land uplift
     * model of Latvia. EVRF2007 heights of 16 points around Latvia held fixed.
     * Uses Normal heights.
     */
    public const EPSG_LATVIAN_HEIGHT_SYSTEM_2000 = 'urn:ogc:def:datum:EPSG::1162';

    /**
     * Latvian coordinate system 2020
     * Type: Geodetic
     * Extent: Latvia
     * Aligned with ETRF2014 at epoch 2020.28. Derived at 5 well-distributed base stations of the Latvian GNSS
     * permanent network (LATREF) in IGb14, transformed to ETRF2014 using EUREF parameters (CT code 8366).
     * LKS-2020 is the second national realization of ETRS89. Replaces LKS-92 (datum code 6661).
     */
    public const EPSG_LATVIAN_COORDINATE_SYSTEM_2020 = 'urn:ogc:def:datum:EPSG::1356';

    /**
     * Latvian geodetic coordinate system 1992
     * Type: Geodetic
     * Extent: Latvia
     * Constrained to 4 ETRS89 points in Latvia from the EUREF Baltic 1992 campaign.
     * Densification of ETRS89 during the 1992 Baltic campaign. Replaced by Latvian coordinate system 2020 (datum code
     * 1356).
     */
    public const EPSG_LATVIAN_GEODETIC_COORDINATE_SYSTEM_1992 = 'urn:ogc:def:datum:EPSG::6661';

    /**
     * Le Pouce 1934
     * Type: Geodetic
     * Extent: Mauritius - mainland onshore
     * Fundamental point: Le Pouce. Latitude: 20°11'42.25"S, longitude: 57°31'18.58"E (of Greenwich).
     */
    public const EPSG_LE_POUCE_1934 = 'urn:ogc:def:datum:EPSG::6699';

    /**
     * Leigon
     * Type: Geodetic
     * Extent: Ghana
     * Fundamental point: GCS Station 121, Leigon. Latitude: 5°38'52.27"N, longitude: 0°11'46.08"W (of Greenwich).
     * Replaced Accra datum (code 6168) from 1978. Coordinates at Leigon fundamental point defined as Accra datum
     * values for that point.
     */
    public const EPSG_LEIGON = 'urn:ogc:def:datum:EPSG::6250';

    /**
     * Lerwick
     * Type: Vertical
     * Extent: UK - Great Britain - Scotland - Shetland Islands onshore
     * Mean Sea Level at Lerwick 1979 correlated to pre-1900. Initially realised through levelling network adjustment,
     * from 2002 redefined to be realised through OSGM geoid model.
     * Orthometric heights.
     */
    public const EPSG_LERWICK = 'urn:ogc:def:datum:EPSG::5140';

    /**
     * Liberia 1964
     * Type: Geodetic
     * Extent: Liberia - onshore
     * Fundamental point: Robertsfield. Latitude: 6°13'53.02"N, longitude: 10°21'35.44"W (of Greenwich).
     */
    public const EPSG_LIBERIA_1964 = 'urn:ogc:def:datum:EPSG::6251';

    /**
     * Libyan Geodetic Datum 2006
     * Type: Geodetic
     * Extent: Libya
     * 5 stations tied to ITRF2000 through 8 days of continuous observations in May 2006.
     * Replaces ELD79.
     */
    public const EPSG_LIBYAN_GEODETIC_DATUM_2006 = 'urn:ogc:def:datum:EPSG::6754';

    /**
     * Lisbon 1890
     * Type: Geodetic
     * Extent: Portugal - mainland - onshore
     * Fundamental point: Castelo Sao Jorge, Lisbon. Latitude: 38°42'43.631"N, longitude: 9°07'54.862"W of Greenwich.
     * Replaced by Lisbon 1937 adjustment (which uses International 1924 ellipsoid).
     */
    public const EPSG_LISBON_1890 = 'urn:ogc:def:datum:EPSG::6666';

    /**
     * Lisbon 1890 (Lisbon)
     * Type: Geodetic
     * Extent: Portugal - mainland - onshore
     * Fundamental point: Castelo Sao Jorge, Lisbon. Latitude: 38°42'43.631"N, longitude: 0°E (of Lisbon).
     * Replaced by Lisbon 1937 adjustment (which uses International 1924 ellipsoid).
     */
    public const EPSG_LISBON_1890_LISBON = 'urn:ogc:def:datum:EPSG::6904';

    /**
     * Lisbon 1937
     * Type: Geodetic
     * Extent: Portugal - mainland - onshore
     * Fundamental point: Castelo Sao Jorge, Lisbon. Latitude: 38°42'43.631"N, longitude: 9°07'54.862"W (of
     * Greenwich).
     * Replaces Lisbon 1890 adjustment (which used Bessel 1841 ellipsoid).
     */
    public const EPSG_LISBON_1937 = 'urn:ogc:def:datum:EPSG::6207';

    /**
     * Lisbon 1937 (Lisbon)
     * Type: Geodetic
     * Extent: Portugal - mainland - onshore
     * Fundamental point: Castelo Sao Jorge, Lisbon. Latitude: 38°42'43.631"N, longitude: 0°E (of Lisbon).
     * Replaces Lisbon 1890 adjustment (which used Bessel 1841 ellipsoid).
     */
    public const EPSG_LISBON_1937_LISBON = 'urn:ogc:def:datum:EPSG::6803';

    /**
     * Lithuania 1994 (ETRS89)
     * Type: Geodetic
     * Extent: Lithuania
     * Constrained to 4 ETRS89 points in Lithuania from the EUREF Baltic 1992 campaign.
     * Densification of ETRS89 during the 1992 Baltic campaign.
     */
    public const EPSG_LITHUANIA_1994_ETRS89 = 'urn:ogc:def:datum:EPSG::6126';

    /**
     * Lithuanian Height System 2007
     * Type: Vertical
     * Extent: Lithuania - onshore
     * Lithuanian realisation of EVRF2007. EVRF2007 heights of 10 points in Lithuania held fixed.
     * Uses Normal heights.
     */
    public const EPSG_LITHUANIAN_HEIGHT_SYSTEM_2007 = 'urn:ogc:def:datum:EPSG::1299';

    /**
     * Little Cayman Vertical Datum 1961
     * Type: Vertical
     * Extent: Cayman Islands - Little Cayman.
     */
    public const EPSG_LITTLE_CAYMAN_VERTICAL_DATUM_1961 = 'urn:ogc:def:datum:EPSG::1098';

    /**
     * Local Tidal Datum at Pago Pago 2020
     * Type: Vertical
     * Extent: American Samoa - Tutuila island
     * MSL at Pago Pago 2011–2016.
     * Normal-orthometric heights. Replaces ASVD02 (datum code 1125) in March 2020 after the ASVD02 benchmarks were
     * destroyed by earthquake activity.
     */
    public const EPSG_LOCAL_TIDAL_DATUM_AT_PAGO_PAGO_2020 = 'urn:ogc:def:datum:EPSG::1302';

    /**
     * Locodjo 1965
     * Type: Geodetic
     * Extent: Côte d'Ivoire (Ivory Coast)
     * Fundamental point: T5 Banco. Latitude: 5°18'50.5"N, longitude: 4°02'05.1"W (of Greenwich).
     */
    public const EPSG_LOCODJO_1965 = 'urn:ogc:def:datum:EPSG::6142';

    /**
     * Loma Quintana
     * Type: Geodetic
     * Extent: Venezuela - onshore north of approximately 7°45'N
     * Fundamental point: Loma Quintana.
     * Replaced by La Canoa (code 6247).
     */
    public const EPSG_LOMA_QUINTANA = 'urn:ogc:def:datum:EPSG::6288';

    /**
     * Lome
     * Type: Geodetic
     * Extent: Togo.
     */
    public const EPSG_LOME = 'urn:ogc:def:datum:EPSG::6252';

    /**
     * Low Water
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The lowest level reached by the water surface in one tidal cycle. When used in inland (non-tidal) waters it is
     * generally defined as a level which the daily mean water level would fall below less than 5% of the time. On a
     * river it is a sloping surface.
     */
    public const EPSG_LOW_WATER = 'urn:ogc:def:datum:EPSG::1093';

    /**
     * Lower Low Water Large Tide
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average of the lowest low waters, one from each of 19 years of observations.
     */
    public const EPSG_LOWER_LOW_WATER_LARGE_TIDE = 'urn:ogc:def:datum:EPSG::1083';

    /**
     * Lowest Astronomical Tide
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The lowest tide level which can be predicted to occur under average meteorological conditions and under any
     * combination of astronomical conditions.
     */
    public const EPSG_LOWEST_ASTRONOMICAL_TIDE = 'urn:ogc:def:datum:EPSG::1080';

    /**
     * Lowest Astronomical Tide Netherlands
     * Type: Vertical
     * Extent: Netherlands - offshore North Sea and nearshore
     * Surface defined through the nllat hydroid model applied to ETRS89.
     * The lowest tide level which can be predicted to occur under average meteorological conditions and under any
     * combination of astronomical conditions.
     */
    public const EPSG_LOWEST_ASTRONOMICAL_TIDE_NETHERLANDS = 'urn:ogc:def:datum:EPSG::1290';

    /**
     * Luxembourg Reference Frame
     * Type: Geodetic
     * Extent: Luxembourg
     * Fundamental point of 1930 triangulation: northern station of Habay-la-Neuve baseline in Belgium. Latitude:
     * 49°43'24.408"N, longitude: 5°38'22.470"E (of Greenwich). Since 2006 LUREF has been realized by GNSS station
     * positions and transformation from ETRF.
     * The transformation from ETRF 2000 first defining LUREF in 2006 has been recomputed in 2014 and 2020.
     */
    public const EPSG_LUXEMBOURG_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::6181';

    /**
     * Luzon 1911
     * Type: Geodetic
     * Extent: Philippines - onshore
     * Fundamental point: Balacan. Latitude: 13°33'41.000"N, longitude: 121°52'03.000"E (of Greenwich).
     * Replaced by Philippine Reference system of 1992 (datum code 6683).
     */
    public const EPSG_LUZON_1911 = 'urn:ogc:def:datum:EPSG::6253';

    /**
     * Lyon Turin Ferroviaire 2004
     * Type: Geodetic
     * Extent: France and Italy - on or related to the rail route from Lyon to Turin
     * Densification of ETRS89 realised through network of 40 stations adjusted to 7 EUREF reference stations in
     * [email protected].
     */
    public const EPSG_LYON_TURIN_FERROVIAIRE_2004 = 'urn:ogc:def:datum:EPSG::1295';

    /**
     * Lyttelton 1937
     * Type: Vertical
     * Extent: New Zealand - South Island - between approximately 41°20'S and 45°S - Lyttleton vertical CRS area
     * MSL at Lyttelton harbour over 9 years between 1918 and 1933.
     */
    public const EPSG_LYTTELTON_1937 = 'urn:ogc:def:datum:EPSG::5161';

    /**
     * M'poraloko
     * Type: Geodetic
     * Extent: Gabon.
     */
    public const EPSG_MPORALOKO = 'urn:ogc:def:datum:EPSG::6266';

    /**
     * MALS09 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from London (Marylebone) to Leamington Spa
     * Defined through the application of the MALS09 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS MALS09-IRF in the emulation of the MALS09 Snake map projection.
     */
    public const EPSG_MALS09_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1343';

    /**
     * MGI 1901
     * Type: Geodetic
     * Extent: Bosnia and Herzegovina; Croatia - onshore; Kosovo; Montenegro - onshore; North Macedonia; Serbia;
     * Slovenia - onshore
     * Fundamental point: Hermannskogel. Latitude: 48°16'15.29"N, longitude: 16°17'55.04"E (of Greenwich).
     * The longitude of the datum origin equates to the Albrecht 1902 value for the Ferro meridian of 17°39'46.02"
     * west of Greenwich. Densified in 1948.
     */
    public const EPSG_MGI_1901 = 'urn:ogc:def:datum:EPSG::1031';

    /**
     * MML07 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the Midland Mainline rail route from Sheffield to London
     * Defined through the application of the MML07 NTv2 transformation (code 9369) to ETRS89 as realized through OSNet
     * v2009 CORS.
     * Created in 2020 to support intermediate CRS "MML07-IRF" in the emulation of the MML07 Snake map projection.
     */
    public const EPSG_MML07_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1271';

    /**
     * MOLDOR11 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Manchester via Ordsall Lane and the Hope Valley to Dore
     * Junction
     * Defined through the application of the MOLDOR11 NTv2 transformation (code 9878) to ETRS89 as realized through
     * OSNet v2009 CORS.
     * Created in 2021 to support intermediate CRS "MOLDOR11-IRF" in the emulation of the MOLDOR11 Snake map
     * projection.
     */
    public const EPSG_MOLDOR11_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1315';

    /**
     * MOLDREF99
     * Type: Geodetic
     * Extent: Moldova
     * Densification of ETRS89.
     */
    public const EPSG_MOLDREF99 = 'urn:ogc:def:datum:EPSG::1032';

    /**
     * MOMRA Terrestrial Reference Frame 2000
     * Type: Geodetic
     * Extent: Saudi Arabia
     * ITRF2000 at epoch 2004.00.
     * 13 CORS Fiducial Stations linked to 7 IGS stations by 10-day long GPS survey.
     */
    public const EPSG_MOMRA_TERRESTRIAL_REFERENCE_FRAME_2000 = 'urn:ogc:def:datum:EPSG::1218';

    /**
     * MOMRA Vertical Geodetic Control
     * Type: Vertical
     * Extent: Saudi Arabia - onshore
     * Mean sea level Jeddah 1969.
     */
    public const EPSG_MOMRA_VERTICAL_GEODETIC_CONTROL = 'urn:ogc:def:datum:EPSG::1219';

    /**
     * MOP78
     * Type: Geodetic
     * Extent: Wallis and Futuna - Wallis.
     */
    public const EPSG_MOP78 = 'urn:ogc:def:datum:EPSG::6639';

    /**
     * MRH21 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to Midland Rail Hub, covering routes through Cardiff, Bristol, Gloucester, Derby,
     * Birmingham, Leicester, and Lincoln
     * Defined through the application of the MRH21 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
     * Created in 2021 to support intermediate CRS "MRH21-IRF" in the emulation of the MRH21 Snake map projection.
     */
    public const EPSG_MRH21_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1314';

    /**
     * MWC18 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Manchester via Wigan and Liverpool to Chester
     * Defined through the application of the MWC18 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
     * Created in 2022 to support intermediate CRS MWC18-IRF in the emulation of the MWC18 Snake map projection.
     */
    public const EPSG_MWC18_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1324';

    /**
     * Macao 1920
     * Type: Geodetic
     * Extent: China - Macao
     * Fundamental point: Avenida Conselheiro Borja base A, later transferred to Monte da Barra, latitude
     * 22°11'03.139"N, longitude 113°31'43.625"E (of Greenwich).
     * Replaces Macao 1907. In 1955 an adjustment made in 1940 was assessed to have unresolvable conflicts and the 1920
     * adjustment was reinstated.
     */
    public const EPSG_MACAO_1920 = 'urn:ogc:def:datum:EPSG::1207';

    /**
     * Macao Geodetic Datum 2008
     * Type: Geodetic
     * Extent: China - Macao
     * ITRF2005 at epoch 2008.38.
     * Locally sometimes referred to as ITRF2005, this is not strictly correct as it applies only at epoch 2008.38 and
     * ignores subsequent tectonic plate motion.
     */
    public const EPSG_MACAO_GEODETIC_DATUM_2008 = 'urn:ogc:def:datum:EPSG::1208';

    /**
     * Macao Height Datum
     * Type: Vertical
     * Extent: China - Macao
     * Mean sea level Ma Kau Seak 1925-1964.
     */
    public const EPSG_MACAO_HEIGHT_DATUM = 'urn:ogc:def:datum:EPSG::1210';

    /**
     * Madrid 1870 (Madrid)
     * Type: Geodetic
     * Extent: Spain - mainland onshore
     * Fundamental point: Retiro observatory, Madrid.
     * Replaced by ED50.
     */
    public const EPSG_MADRID_1870_MADRID = 'urn:ogc:def:datum:EPSG::6903';

    /**
     * Madzansua
     * Type: Geodetic
     * Extent: Mozambique - west - Tete province
     * Fundamental point: Madzansua.
     * Replaced by transformation to Tete datum (datum code 6127).
     */
    public const EPSG_MADZANSUA = 'urn:ogc:def:datum:EPSG::6128';

    /**
     * Mahe 1971
     * Type: Geodetic
     * Extent: Seychelles - Mahe Island
     * Fundamental point: Station SITE. Latitude: 4°40'14.644"S, longitude: 55°28'44.488"E (of Greenwich).
     * South East Island 1943 (datum code 1138) used for topographic mapping, cadastral and hydrographic survey.
     */
    public const EPSG_MAHE_1971 = 'urn:ogc:def:datum:EPSG::6256';

    /**
     * Makassar
     * Type: Geodetic
     * Extent: Indonesia - south west Sulawesi
     * Fundamental point: station P1, Moncongloe. Latitude: 5°08'41.42"S, long 119°24'14.94"E (of Greenwich).
     */
    public const EPSG_MAKASSAR = 'urn:ogc:def:datum:EPSG::6257';

    /**
     * Makassar (Jakarta)
     * Type: Geodetic
     * Extent: Indonesia - south west Sulawesi
     * Fundamental point: station P1, Moncongloe. Latitude 5°08'41.42"S, longitude 12°35'47.15"E (of Jakarta).
     */
    public const EPSG_MAKASSAR_JAKARTA = 'urn:ogc:def:datum:EPSG::6804';

    /**
     * Malin Head
     * Type: Vertical
     * Extent: Ireland - onshore. UK - Northern Ireland (Ulster) - onshore
     * Mean sea level between January 1960 and December 1969. Initially realised through levelling network adjustment,
     * from 2002 redefined to be realised through OSGM geoid model.
     * Orthometric heights.
     */
    public const EPSG_MALIN_HEAD = 'urn:ogc:def:datum:EPSG::5130';

    /**
     * Mallorca
     * Type: Vertical
     * Extent: Spain - Balearic Islands - Mallorca onshore
     * Mean Sea Level at Palma de Mallorca harbour between April 1997 and December 2006.
     * Orthometric heights.
     */
    public const EPSG_MALLORCA = 'urn:ogc:def:datum:EPSG::1275';

    /**
     * Malongo 1987
     * Type: Geodetic
     * Extent: Angola (Cabinda) - offshore; The Democratic Republic of the Congo (Zaire) - offshore
     * Fundamental point: Station Y at Malongo base camp. Latitude: 5°23'30.810"S, longitude: 12°12'01.590"E (of
     * Greenwich).
     * Replaced Mhast (offshore) (code 6705) in 1987. Origin coordinates constrained to those of Mhast (offshore) but
     * other station coordinates differ. References to "Mhast" since 1987 often should have stated "Malongo 1987".
     */
    public const EPSG_MALONGO_1987 = 'urn:ogc:def:datum:EPSG::6259';

    /**
     * Manoca 1962
     * Type: Geodetic
     * Extent: Cameroon - coastal area
     * Reservoir centre at the  Manoca tower ("tube Suel"), 3°51'49.896"N, 9°36'49.347"E (of Greenwich).
     * The intent of the Bukavu 1953 conference was to adopt the Clarke 1880 (RGS) ellipsoid (code 7012) but in
     * practice this datum has used the IGN version. Replaces Douala 1948 (code 6192).
     */
    public const EPSG_MANOCA_1962 = 'urn:ogc:def:datum:EPSG::6193';

    /**
     * Maputo
     * Type: Vertical
     * Extent: Mozambique - onshore
     * Mean sea level at Maputo.
     */
    public const EPSG_MAPUTO = 'urn:ogc:def:datum:EPSG::5121';

    /**
     * Marco Geocentrico Nacional de Referencia
     * Type: Geodetic
     * Extent: Colombia. Includes San Andres y Providencia, Malpelo Islands, Roncador Bank, Serrana Bank and Serranilla
     * Bank
     * Densification of SIRGAS95 (ITRF94 at epoch 1995.4) in Colombia. Bogota observatory coordinates: Latitude:
     * 4°35'46.3215"N, longitude: 74°04'39.0285"W (of Greenwich).
     * Densification of SIRGAS 1995 within Colombia. Replaces Bogota 1975 (datum code 6218).
     */
    public const EPSG_MARCO_GEOCENTRICO_NACIONAL_DE_REFERENCIA = 'urn:ogc:def:datum:EPSG::6686';

    /**
     * Marco Geocentrico Nacional de Referencia 2018
     * Type: Geodetic
     * Extent: Colombia. Includes San Andres y Providencia, Malpelo Islands, Roncador Bank, Serrana Bank and Serranilla
     * Bank
     * Densification of ITRF2014 at epoch 2018.0 in Colombia. Bogota observatory coordinates: Latitude:
     * 4°35'46.33160"N, longitude: 74°04'39.02797"W (of Greenwich).
     * Active network referenced to [email protected] and passive network referenced to [email protected] updated to
     * ITRF2014 using IERS transformations EPSG:7790 and EPSG:8075 respectively then VEMOS2009 velocity model applied
     * to bring coordinates to epoch 2018.0.
     */
    public const EPSG_MARCO_GEOCENTRICO_NACIONAL_DE_REFERENCIA_2018 = 'urn:ogc:def:datum:EPSG::1329';

    /**
     * Marco Geodesico Nacional de Bolivia
     * Type: Geodetic
     * Extent: Bolivia
     * IGS05 (ITRF2005) at epoch 2010.2.  Densification of SIRGAS95 network in Bolivia, consisting of 125 passive
     * geodetic stations and 8 continuous recording GPS stations.
     * Densification of SIRGAS 1995 within Bolivia. Replaces PSAD56 (datum code 6248) in Bolivia.
     */
    public const EPSG_MARCO_GEODESICO_NACIONAL_DE_BOLIVIA = 'urn:ogc:def:datum:EPSG::1063';

    /**
     * Marcus Island 1952
     * Type: Geodetic
     * Extent: Japan - onshore - Tokyo-to south of 28°N and east of 143°E - Minamitori-shima (Marcus Island)
     * Marcus Island Astronomic Station.
     */
    public const EPSG_MARCUS_ISLAND_1952 = 'urn:ogc:def:datum:EPSG::6711';

    /**
     * Marshall Islands 1960
     * Type: Geodetic
     * Extent: Marshall Islands - onshore. Wake atoll onshore.
     */
    public const EPSG_MARSHALL_ISLANDS_1960 = 'urn:ogc:def:datum:EPSG::6732';

    /**
     * Martinique 1938
     * Type: Geodetic
     * Extent: Martinique - onshore
     * Fundamental point: Fort Desaix. Latitude: 14°36'54.090"N, longitude: 61°04'04.030"W (of Greenwich).
     * Replaced by RRAF 1991 (datum code 1047).
     */
    public const EPSG_MARTINIQUE_1938 = 'urn:ogc:def:datum:EPSG::6625';

    /**
     * Martinique 1955
     * Type: Vertical
     * Extent: Martinique - onshore
     * Mean sea level at Fort de France 1939. Marker DO-4-II on quay wall with elevation of 1.38m above msl.
     * Orthometric heights. Replaced by Martinique 1987 (datum code 5154).
     */
    public const EPSG_MARTINIQUE_1955 = 'urn:ogc:def:datum:EPSG::5192';

    /**
     * Martinique 1987
     * Type: Vertical
     * Extent: Martinique - onshore
     * Mean sea level 1939 at Fort de France. Origin = marker Nbc2 on rebuilt quay wall with defined elevation of 1.38m
     * above msl. Martinique 1987 height 0.00m is 0.56m above SHOM sounding datum.
     * Orthometric heights. Replaces Martinique 1955 (datum code 5192).
     */
    public const EPSG_MARTINIQUE_1987 = 'urn:ogc:def:datum:EPSG::5154';

    /**
     * Massawa
     * Type: Geodetic
     * Extent: Eritrea.
     */
    public const EPSG_MASSAWA = 'urn:ogc:def:datum:EPSG::6262';

    /**
     * Maupiti 83
     * Type: Geodetic
     * Extent: French Polynesia - Society Islands - Maupiti
     * Fundamental point: Pitiahe South Base. Latitude: 16°28'28.942"S, longitude: 152°14'55.059"W (of Greenwich).
     * Replaced by RGPF (datum code 6687).
     */
    public const EPSG_MAUPITI_83 = 'urn:ogc:def:datum:EPSG::6692';

    /**
     * Maupiti SAU 2001
     * Type: Vertical
     * Extent: French Polynesia - Society Islands - Maupiti
     * Fundamental benchmark: RN11
     * Included as part of NGPF - see datum code 5195.
     */
    public const EPSG_MAUPITI_SAU_2001 = 'urn:ogc:def:datum:EPSG::5199';

    /**
     * Mauritania 1999
     * Type: Geodetic
     * Extent: Mauritania
     * ITRF96 at epoch 1997.0
     * A network of 36 GPS stations tied to ITRF96, 8 of which are IGN 1962 astronomic points.
     */
    public const EPSG_MAURITANIA_1999 = 'urn:ogc:def:datum:EPSG::6702';

    /**
     * Mayotte 1950
     * Type: Vertical
     * Extent: Mayotte - onshore
     * IGN 1950 marker (height 0.0m) on southwest jetty at Dzaoudzi (Petite-Terre) is 2.18m above zero of tide gauge.
     * SHOM 1953 marker on east (Issoufali) jetty at Dzaoudzi (height 4.74m) is the base for Mayotte heights.
     * Datum transferred to benchmark RN0 with height of 2.774m above tide gauge on eastern jetty at Mamoudzou
     * (Grand-Terre) in 1979.
     */
    public const EPSG_MAYOTTE_1950 = 'urn:ogc:def:datum:EPSG::5191';

    /**
     * Mean High Water
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average height of the high waters over a 19-year period.
     */
    public const EPSG_MEAN_HIGH_WATER = 'urn:ogc:def:datum:EPSG::1092';

    /**
     * Mean High Water Spring Tides
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average height of the high waters of spring tides.
     */
    public const EPSG_MEAN_HIGH_WATER_SPRING_TIDES = 'urn:ogc:def:datum:EPSG::1088';

    /**
     * Mean Higher High Water
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average height of the higher high waters over a 19-year period.
     */
    public const EPSG_MEAN_HIGHER_HIGH_WATER = 'urn:ogc:def:datum:EPSG::1090';

    /**
     * Mean Low Water
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average height of all low waters over a 19-year period.
     */
    public const EPSG_MEAN_LOW_WATER = 'urn:ogc:def:datum:EPSG::1091';

    /**
     * Mean Low Water Spring Tides
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average height of the low waters of spring tides.
     */
    public const EPSG_MEAN_LOW_WATER_SPRING_TIDES = 'urn:ogc:def:datum:EPSG::1087';

    /**
     * Mean Lower Low Water
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average height of the lower low waters over a 19-year period.
     */
    public const EPSG_MEAN_LOWER_LOW_WATER = 'urn:ogc:def:datum:EPSG::1089';

    /**
     * Mean Lower Low Water Spring Tides
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average height of the lower low water spring tides.
     */
    public const EPSG_MEAN_LOWER_LOW_WATER_SPRING_TIDES = 'urn:ogc:def:datum:EPSG::1086';

    /**
     * Mean Sea Level
     * Type: Vertical
     * Extent: World
     * Not specific to any location or epoch.
     * The average height of the surface of the sea at a tide station for all stages of the tide over a 19-year period,
     * usually determined from hourly height readings measured from a fixed predetermined reference level. Approximates
     * geoid.
     */
    public const EPSG_MEAN_SEA_LEVEL = 'urn:ogc:def:datum:EPSG::5100';

    /**
     * Mean Sea Level Netherlands
     * Type: Vertical
     * Extent: Netherlands - offshore North Sea and nearshore
     * Surface defined through the nlgeo geoid model applied to ETRS89.
     * Coincides with NAP datum plane, extended offshore through the nlgeo geoid model. Approximates physical mean sea
     * surface to a few decimetres.
     */
    public const EPSG_MEAN_SEA_LEVEL_NETHERLANDS = 'urn:ogc:def:datum:EPSG::1270';

    /**
     * Mean Sea Level UK & Ireland VORF08
     * Type: Vertical
     * Extent: Ireland and UK (including Isle of Man and Channel Islands) - inshore, nearshore and offshore
     * MSL UK & Ireland VORF08 is defined by the Vertical Offshore Reference Frame v2.11 2008. MSL UK & Ireland VORF08
     * is reduced to epoch 2000.0.
     * OSGM05 model used.
     */
    public const EPSG_MEAN_SEA_LEVEL_UK_AND_IRELAND_VORF08 = 'urn:ogc:def:datum:EPSG::1330';

    /**
     * Melilla
     * Type: Vertical
     * Extent: Spain - Melilla onshore
     * Mean Sea Level at Melilla harbour between 2008-01-01 and 2019-12-31.
     * Orthometric heights. Replaces an earlier vertical datum in Ceuta harbour measured between 1908 and 1927.
     */
    public const EPSG_MELILLA = 'urn:ogc:def:datum:EPSG::1364';

    /**
     * Menorca
     * Type: Vertical
     * Extent: Spain - Balearic Islands - Menorca onshore
     * Mean Sea Level at Ciutadella harbour between June 2007 and June 2008.
     * Orthometric heights.
     */
    public const EPSG_MENORCA = 'urn:ogc:def:datum:EPSG::1276';

    /**
     * Merchich
     * Type: Geodetic
     * Extent: Africa - Morocco and Western Sahara - onshore
     * Fundamental point: Merchich. Latitude: 33°26'59.672"N, longitude: 7°33'27.295"W (of Greenwich).
     */
    public const EPSG_MERCHICH = 'urn:ogc:def:datum:EPSG::6261';

    /**
     * Mexico ITRF2008
     * Type: Geodetic
     * Extent: Mexico
     * ITRF2008 at epoch 2010.00.
     * Realised by a frame of 15 active GPS stations observed and adjusted in the ITRF2008. Includes ties to tide
     * gauges. Replaces Mexico ITRF92 (datum code 1042).
     */
    public const EPSG_MEXICO_ITRF2008 = 'urn:ogc:def:datum:EPSG::1120';

    /**
     * Mexico ITRF92
     * Type: Geodetic
     * Extent: Mexico
     * ITRF1992 at epoch 1988.00.
     * Realized by a frame of 15 active GPS stations observed and adjusted in the ITRF1992. Includes ties to tide
     * gauges. Replaces NAD27 (datum code 6267). Replaced by Mexico ITRF2008 (datum code 1120) from December 2010.
     */
    public const EPSG_MEXICO_ITRF92 = 'urn:ogc:def:datum:EPSG::1042';

    /**
     * Mhast (offshore)
     * Type: Geodetic
     * Extent: Angola (Cabinda) - offshore; The Democratic Republic of the Congo (Zaire) - offshore
     * Fundamental point: Station Y at Malongo base camp. Latitude: 5°23'30.810"S, longitude: 12°12'01.590"E (of
     * Greenwich).
     * Origin coordinates determined by Transit single point position using 32 passes and transformed from WGS72BE
     * using transformation code 15790. Differs from Mhast (onshore) by approximately 10m. Replaced in 1987 by Malongo
     * 1987 (code 6259).
     */
    public const EPSG_MHAST_OFFSHORE = 'urn:ogc:def:datum:EPSG::6705';

    /**
     * Mhast (onshore)
     * Type: Geodetic
     * Extent: Angola (Cabinda); The Democratic Republic of the Congo (Zaire) - onshore coastal area and offshore
     * Probably adopted a Mhast 1951 coordinate set but associated an incorrect ellipsoid with it.
     * Adopted by oil industry with intention of being Mhast 1951 (code 6703) but incorrectly (for Mhast 1951) used the
     * International 1924 ellipsoid. This datum differs by about 400 metres from the Portuguese Mhast 1951 and Camacupa
     * datums.
     */
    public const EPSG_MHAST_ONSHORE = 'urn:ogc:def:datum:EPSG::6704';

    /**
     * Midway 1961
     * Type: Geodetic
     * Extent: United States Minor Outlying Islands - Midway Islands - Sand Island and Eastern Island.
     */
    public const EPSG_MIDWAY_1961 = 'urn:ogc:def:datum:EPSG::6727';

    /**
     * Militar-Geographische Institut
     * Type: Geodetic
     * Extent: Austria
     * Fundamental point: Hermannskogel. Latitude: 48°16'15.29"N, longitude: 16°17'41.06"E (of Greenwich).
     * The longitude of the datum origin equates to a value for the Ferro meridian of 17°40' exactly west of
     * Greenwich.
     */
    public const EPSG_MILITAR_GEOGRAPHISCHE_INSTITUT = 'urn:ogc:def:datum:EPSG::6312';

    /**
     * Militar-Geographische Institut (Ferro)
     * Type: Geodetic
     * Extent: Austria. Bosnia and Herzegovina. Croatia - onshore. Kosovo. Montenegro - onshore. North Macedonia.
     * Serbia. Slovenia - onshore
     * Fundamental point: Hermannskogel. Latitude: 48°16'15.29"N, longitude: 33°57'41.06"E (of Ferro).
     * Replaced by MGI in Austria and MGI 1901 in former Yugoslavia.
     */
    public const EPSG_MILITAR_GEOGRAPHISCHE_INSTITUT_FERRO = 'urn:ogc:def:datum:EPSG::6805';

    /**
     * Ministerio de Marina Norte
     * Type: Geodetic
     * Extent: Argentina - Tierra del Fuego onshore
     * Developed by the Servicio de Hidrografia Naval.
     */
    public const EPSG_MINISTERIO_DE_MARINA_NORTE = 'urn:ogc:def:datum:EPSG::1258';

    /**
     * Ministerio de Marina Sur
     * Type: Geodetic
     * Extent: Argentina - Tierra del Fuego onshore
     * Developed by the Servicio de Hidrografia Naval.
     */
    public const EPSG_MINISTERIO_DE_MARINA_SUR = 'urn:ogc:def:datum:EPSG::1259';

    /**
     * Minna
     * Type: Geodetic
     * Extent: Nigeria
     * Fundamental point: Minna base station L40. Latitude: 9°38'08.87"N, longitude: 6°30'58.76"E (of Greenwich).
     */
    public const EPSG_MINNA = 'urn:ogc:def:datum:EPSG::6263';

    /**
     * Missao Hidrografico Angola y Sao Tome 1951
     * Type: Geodetic
     * Extent: Angola - Cabinda
     * Extension of Camacupa datum into Cabinda.
     * A variation of this datum has been adopted by the oil industry but incorrectly using the International 1924
     * ellipsoid and not tied to the official Portuguese triangulation - see Mhast (onshore) and Mhast (offshore)
     * (codes 6704 and 6705).
     */
    public const EPSG_MISSAO_HIDROGRAFICO_ANGOLA_Y_SAO_TOME_1951 = 'urn:ogc:def:datum:EPSG::6703';

    /**
     * Monte Mario
     * Type: Geodetic
     * Extent: Italy; San Marino, Vatican City State
     * Fundamental point: Monte Mario. Latitude: 41°55'25.51"N, longitude: 12°27'08.4"E (of Greenwich).
     * Replaced Genova datum, Bessel 1841 ellipsoid, from 1940.
     */
    public const EPSG_MONTE_MARIO = 'urn:ogc:def:datum:EPSG::6265';

    /**
     * Monte Mario (Rome)
     * Type: Geodetic
     * Extent: Italy; San Marino, Vatican City State
     * Fundamental point: Monte Mario. Latitude: 41°55'25.51"N, longitude: 0°00' 00.00"E (of Rome).
     * Replaced Genova datum, Bessel 1841 ellipsoid, from 1940.
     */
    public const EPSG_MONTE_MARIO_ROME = 'urn:ogc:def:datum:EPSG::6806';

    /**
     * Montserrat 1958
     * Type: Geodetic
     * Extent: Montserrat - onshore
     * Fundamental point: station M36.
     */
    public const EPSG_MONTSERRAT_1958 = 'urn:ogc:def:datum:EPSG::6604';

    /**
     * Moorea 87
     * Type: Geodetic
     * Extent: French Polynesia - Society Islands - Moorea
     * Two stations on Tahiti whose coordinates from the Tahiti 1979 adjustment were held fixed.
     * Replaces Tahiti 52 (datum code 6628) in Moorea. Replaced by RGPF (datum code 6687).
     */
    public const EPSG_MOOREA_87 = 'urn:ogc:def:datum:EPSG::6691';

    /**
     * Moorea SAU 1981
     * Type: Vertical
     * Extent: French Polynesia - Society Islands - Moorea
     * Fundamental benchmark: RN225
     * Included as part of NGPF - see datum code 5195.
     */
    public const EPSG_MOOREA_SAU_1981 = 'urn:ogc:def:datum:EPSG::5197';

    /**
     * Moturiki 1953
     * Type: Vertical
     * Extent: New Zealand - North Island - Moturiki vertical CRS area
     * MSL at Moturiki Island February 1949 to December 1952.
     */
    public const EPSG_MOTURIKI_1953 = 'urn:ogc:def:datum:EPSG::5162';

    /**
     * Mount Dillon
     * Type: Geodetic
     * Extent: Trinidad and Tobago - Tobago - onshore
     * Fundamental point: Mount Dillon triangulation station. Latitude: 11°15'07.843"N, longitude: 60°41'09.632"W (of
     * Greenwich).
     */
    public const EPSG_MOUNT_DILLON = 'urn:ogc:def:datum:EPSG::6157';

    /**
     * Moznet (ITRF94)
     * Type: Geodetic
     * Extent: Mozambique
     * ITRF94 at epoch 1996.9.
     */
    public const EPSG_MOZNET_ITRF94 = 'urn:ogc:def:datum:EPSG::6130';

    /**
     * N2000
     * Type: Vertical
     * Extent: Finland - onshore
     * Height at Metsaahovi (latitude 60.21762°N, longitude 24.39517°E) of 54.4233m related to EVRF2000 origin
     * through Baltic Levelling Ring adjustment at epoch 2000.0.
     * Realized through the third precise levelling network. Uses normal heights. Replaces N43 and N60 (datum codes
     * 1213 and 5116). To account for isostatic land uplift use NKG2005 model.
     */
    public const EPSG_N2000 = 'urn:ogc:def:datum:EPSG::1030';

    /**
     * NAD83 (Continuously Operating Reference Station 1996)
     * Type: Geodetic
     * Extent: Puerto Rico. USA - Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware;
     * Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts;
     * Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico;
     * New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina;
     * South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming. US
     * Virgin Islands
     * Defined by time-dependent transformations from ITRF (see CT codes 6864-6866). The ITRF realization used has been
     * changed periodically; ITRF96 in years 1997 through 1999, ITRF97 in 2000 and 2001 and ITRF2000 from 2002.
     * Replaced by NAD83(2011) from 2011-09-06.
     */
    public const EPSG_NAD83_CONTINUOUSLY_OPERATING_REFERENCE_STATION_1996 = 'urn:ogc:def:datum:EPSG::1133';

    /**
     * NAD83 (Federal Base Network)
     * Type: Geodetic
     * Extent: American Samoa - Tutuila, Aunu'u, Ofu, Olesega, Ta'u and Rose islands - onshore. Guam - onshore.
     * Northern Mariana Islands - onshore. Puerto Rico - onshore. USA - CONUS - Alabama; Arizona; Arkansas; California;
     * Colorado; Connecticut; Delaware; Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana;
     * Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New
     * Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania;
     * Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West
     * Virginia; Wisconsin; Wyoming - onshore plus Gulf of Mexico offshore continental shelf (GoM OCS). US Virgin
     * Islands - onshore
     * A collection of individual state-wide adjustments including GPS observations made between 1997 and 2004.
     * In CA CT FL ID MA ME MT NC NH NJ NV NY OR RI SC TN VT WA and WI, replaces the early 1990s HARN adjustment. In
     * rest of CONUS the difference between the HARN and FBN adjustments was under 5cm and the original HARN
     * adjustments were adopted as NAD83(FBN).
     */
    public const EPSG_NAD83_FEDERAL_BASE_NETWORK = 'urn:ogc:def:datum:EPSG::1211';

    /**
     * NAD83 (High Accuracy Reference Network - Corrected)
     * Type: Geodetic
     * Extent: Puerto Rico and US Virgin Islands - onshore
     * In PRVI replaces NAD83(HARN) to correct errors. Replaced by NAD83(FBN).
     */
    public const EPSG_NAD83_HIGH_ACCURACY_REFERENCE_NETWORK_CORRECTED = 'urn:ogc:def:datum:EPSG::1212';

    /**
     * NAD83 (High Accuracy Reference Network)
     * Type: Geodetic
     * Extent: American Samoa - onshore - Tutuila, Aunu'u, Ofu, Olesega, Ta'u and Rose islands. Guam - onshore.
     * Northern Mariana Islands - onshore. Puerto Rico - onshore. USA - onshore Alabama, Alaska, Arizona, Arkansas,
     * California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas,
     * Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana,
     * Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma,
     * Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia,
     * Washington, West Virginia, Wisconsin and Wyoming; offshore Gulf of Mexico continental shelf (GoM OCS). US Virgin
     * Islands - onshore
     * A collection of individual state-wide adjustments including GPS observations made between 1991 and 1996.
     * In CONUS, American Samoa and Guam replaced by NAD83(FBN). In Alaska replaced by NAD83(NSRS2007). In Hawaii
     * replaced by NAD83(PA11). In Puerto Rico and US Virgin Islands replaced by NAD83(HARN Corrected).
     */
    public const EPSG_NAD83_HIGH_ACCURACY_REFERENCE_NETWORK = 'urn:ogc:def:datum:EPSG::6152';

    /**
     * NAD83 (National Spatial Reference System 2007)
     * Type: Geodetic
     * Extent: Puerto Rico. USA - Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware;
     * Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts;
     * Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico;
     * New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina;
     * South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming. US
     * Virgin Islands
     * Coordinates of 486 national continually operating reference system (CORS) and 195 collaborative GPS (CGPS) sites
     * constrained to their CORS96 values, ITRF2000 at epoch 2002.0.
     * Replaced by NAD83 (National Spatial Reference System 2011), datum code 1116.
     */
    public const EPSG_NAD83_NATIONAL_SPATIAL_REFERENCE_SYSTEM_2007 = 'urn:ogc:def:datum:EPSG::6759';

    /**
     * NAD83 (National Spatial Reference System 2011)
     * Type: Geodetic
     * Extent: Puerto Rico. USA - Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware;
     * Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts;
     * Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico;
     * New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina;
     * South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming. US
     * Virgin Islands
     * Coordinates of a nationwide adjustment of 79,546 NGS "passive" control stations in CONUS and Alaska, constrained
     * to 1,171 current CORS station coordinates at epoch 2010.0.
     * Replaces NAD83(NSRS2007). Transformaton code 7807 from ITRF2008 is understood to underlay the CORS station
     * coordinates.
     */
    public const EPSG_NAD83_NATIONAL_SPATIAL_REFERENCE_SYSTEM_2011 = 'urn:ogc:def:datum:EPSG::1116';

    /**
     * NAD83 (National Spatial Reference System MA11)
     * Type: Geodetic
     * Extent: Guam, Northern Mariana Islands and Palau;
     * Coordinates of a nationwide adjustment including 171 NGS "passive" control stations constrained to 24 current
     * Pacific CORS station coordinates at epoch 2010.0.
     * Replaces NAD83(HARN) (GGN93) and NAD83(FBN) in Guam. ITRF2008 is understood to underlay the latest CORS station
     * coordinates.
     */
    public const EPSG_NAD83_NATIONAL_SPATIAL_REFERENCE_SYSTEM_MA11 = 'urn:ogc:def:datum:EPSG::1118';

    /**
     * NAD83 (National Spatial Reference System PA11)
     * Type: Geodetic
     * Extent: American Samoa, Marshall Islands, USA - Hawaii, United States minor outlying islands;
     * Coordinates of a nationwide adjustment including 345 NGS "passive" control stations constrained to 24 current
     * Pacific CORS station coordinates at epoch 2010.0.
     * Replaces NAD83(HARN) and NAD83(FBN) in Hawaii and American Samoa. ITRF2008 is understood to underlay the latest
     * CORS station coordinates.
     */
    public const EPSG_NAD83_NATIONAL_SPATIAL_REFERENCE_SYSTEM_PA11 = 'urn:ogc:def:datum:EPSG::1117';

    /**
     * NAD83 Canadian Spatial Reference System
     * Type: Geodetic
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Includes all versions of NAD83(CSRS) from v2 [CSRS98] onwards without specific identification. As such it has an
     * accuracy of approximately 1m.
     */
    public const EPSG_NAD83_CANADIAN_SPATIAL_REFERENCE_SYSTEM = 'urn:ogc:def:datum:EPSG::6140';

    /**
     * NEA74 Noumea
     * Type: Geodetic
     * Extent: New Caledonia - Grande Terre - Noumea district
     * Noumea old signal station.
     */
    public const EPSG_NEA74_NOUMEA = 'urn:ogc:def:datum:EPSG::6644';

    /**
     * NGO 1948
     * Type: Geodetic
     * Extent: Norway - onshore
     * Fundamental point: Oslo observatory. Latitude: 59°54'43.7"N, longitude: 10°43'22.5"E (of Greenwich).
     */
    public const EPSG_NGO_1948 = 'urn:ogc:def:datum:EPSG::6273';

    /**
     * NGO 1948 (Oslo)
     * Type: Geodetic
     * Extent: Norway - onshore
     * Fundamental point: Oslo observatory. Latitude: 59°54'43.7"N, longitude: 0°00'00.0"E (of Oslo).
     */
    public const EPSG_NGO_1948_OSLO = 'urn:ogc:def:datum:EPSG::6817';

    /**
     * NSIDC International 1924 Authalic Sphere
     * Type: Geodetic
     * Extent: World
     * Created to support EASE-Grid v1. Note: for EASE-Grid v2, WGS 84 used.
     */
    public const EPSG_NSIDC_INTERNATIONAL_1924_AUTHALIC_SPHERE = 'urn:ogc:def:datum:EPSG::1360';

    /**
     * NSWC 9Z-2
     * Type: Geodetic
     * Extent: World
     * Transit precise ephemeris before 1991.
     */
    public const EPSG_NSWC_9Z_2 = 'urn:ogc:def:datum:EPSG::6276';

    /**
     * Nahrwan 1934
     * Type: Geodetic
     * Extent: Iraq - onshore; Iran - onshore northern Gulf coast and west bordering southeast Iraq
     * Fundamental point: Nahrwan south base.  Latitude: 33°19'10.87"N, longitude: 44°43'25.54"E (of Greenwich).
     * This adjustment later discovered to have a significant orientation error. In Iran replaced by FD58. In Iraq,
     * replaced by Karbala 1979.
     */
    public const EPSG_NAHRWAN_1934 = 'urn:ogc:def:datum:EPSG::6744';

    /**
     * Nahrwan 1967
     * Type: Geodetic
     * Extent: Arabian Gulf; Qatar - offshore; UAE - Abu Dhabi; Dubai; Sharjah; Ajman; Fujairah; Ras Al Kaimah; Umm Al
     * Qaiwain
     * Fundamental point: Nahrwan south base.  Latitude: 33°19'10.87"N, longitude: 44°43'25.54"E (of Greenwich).
     */
    public const EPSG_NAHRWAN_1967 = 'urn:ogc:def:datum:EPSG::6270';

    /**
     * Nakhl-e Ghanem
     * Type: Geodetic
     * Extent: Iran - Kangan district
     * Coordinates of two stations determined with respect to ITRF 2000 at epoch 2005.2: BMT1 latitude
     * 27°42'09.8417"N, longitude 52°12'11.0362"E (of Greenwich); Total1 latitude 27°31'03.8896"N, longitude
     * 52°36'13.1312"E (of Greenwich).
     */
    public const EPSG_NAKHL_E_GHANEM = 'urn:ogc:def:datum:EPSG::6693';

    /**
     * Naparima 1955
     * Type: Geodetic
     * Extent: Trinidad and Tobago - Trinidad - onshore
     * Fundamental point: Naparima. Latitude: 10°16'44.860"N, longitude: 61°27'34.620"W (of Greenwich).
     * Extended to Tobago as Naparima 1972. (Note: Naparima 1972 is not used in Trinidad).
     */
    public const EPSG_NAPARIMA_1955 = 'urn:ogc:def:datum:EPSG::6158';

    /**
     * Naparima 1972
     * Type: Geodetic
     * Extent: Trinidad and Tobago - Tobago - onshore
     * Fundamental point: Naparima. Latitude: 10°16'44.860"N, longitude: 61°27'34.620"W (of Greenwich).
     * Naparima 1972 is an extension to Tobago of the Naparima 1955 network of Trinidad.
     */
    public const EPSG_NAPARIMA_1972 = 'urn:ogc:def:datum:EPSG::6271';

    /**
     * Napier 1962
     * Type: Vertical
     * Extent: New Zealand - North Island - Hawkes Bay meridional circuit and Napier vertical crs area
     * MSL at Napier harbour. Period of derivation unknown.
     */
    public const EPSG_NAPIER_1962 = 'urn:ogc:def:datum:EPSG::5163';

    /**
     * National Geodetic Network
     * Type: Geodetic
     * Extent: Kuwait - onshore
     * Replaces 1984 adjustment which used the WGS72 ellipsoid.
     */
    public const EPSG_NATIONAL_GEODETIC_NETWORK = 'urn:ogc:def:datum:EPSG::6318';

    /**
     * National Geodetic Vertical Datum 1929
     * Type: Vertical
     * Extent: USA - CONUS onshore - Alabama; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida;
     * Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan;
     * Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York;
     * North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina; South Dakota;
     * Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming
     * 26 tide gauges in the US and Canada.
     * Normal orthometric heights.
     */
    public const EPSG_NATIONAL_GEODETIC_VERTICAL_DATUM_1929 = 'urn:ogc:def:datum:EPSG::5102';

    /**
     * National Vertical Datum 1992
     * Type: Vertical
     * Extent: Bangladesh - onshore
     * Mean Sea Level 1992-1994 at tidal station at Rangadia, Chittagong.
     */
    public const EPSG_NATIONAL_VERTICAL_DATUM_1992 = 'urn:ogc:def:datum:EPSG::1303';

    /**
     * Nelson 1955
     * Type: Vertical
     * Extent: New Zealand - South Island - north of approximately 42°20'S - Nelson vertical CRS area
     * MSL at Nelson harbour 1939-1942.
     */
    public const EPSG_NELSON_1955 = 'urn:ogc:def:datum:EPSG::5164';

    /**
     * Nepal 1981
     * Type: Geodetic
     * Extent: Nepal
     * Fundamental point: Station 12/157 Nagarkot. Latitude: 27°41'31.04"N, longitude: 85°31'20.23"E (of Greenwich).
     */
    public const EPSG_NEPAL_1981 = 'urn:ogc:def:datum:EPSG::1111';

    /**
     * New Beijing
     * Type: Geodetic
     * Extent: China - onshore
     * Derived by conformal transformation of Xian 1980 adjustment onto Krassowsky ellipsoid.
     * From 1982 replaces Beijing 1954.
     */
    public const EPSG_NEW_BEIJING = 'urn:ogc:def:datum:EPSG::1045';

    /**
     * New Zealand Geodetic Datum 1949
     * Type: Geodetic
     * Extent: New Zealand - North Island, South Island, Stewart Island - onshore and nearshore
     * Fundamental point: Papatahi. Latitude: 41°19' 8.900"S, longitude: 175°02'51.000"E (of Greenwich).
     * Replaced by New Zealand Geodetic Datum 2000 (code 6167) from March 2000.
     */
    public const EPSG_NEW_ZEALAND_GEODETIC_DATUM_1949 = 'urn:ogc:def:datum:EPSG::6272';

    /**
     * New Zealand Geodetic Datum 2000
     * Type: Geodetic
     * Extent: New Zealand. Includes Antipodes Islands, Auckland Islands, Bounty Islands, Chatham Islands, Cambell
     * Island, Kermadec Islands, Raoul Island and Snares Islands
     * Based on ITRF96 at epoch 2000.0
     * Replaces New Zealand Geodetic Datum 1949 (code 6272) and Chatham Islands Datum 1979 (code 6673) from March 2000.
     */
    public const EPSG_NEW_ZEALAND_GEODETIC_DATUM_2000 = 'urn:ogc:def:datum:EPSG::6167';

    /**
     * New Zealand Vertical Datum 2009
     * Type: Vertical
     * Extent: New Zealand. Includes Antipodes Islands, Auckland Islands, Bounty Islands, Chatham Islands, Cambell
     * Island, Kermadec Islands, Raoul Island and Snares Islands
     * New Zealand Quasigeoid 2009 which is defined by the application of the NZ geoid 2009 grid to NZGD2000
     * ellipsoidal heights. See transformation code 4459.
     */
    public const EPSG_NEW_ZEALAND_VERTICAL_DATUM_2009 = 'urn:ogc:def:datum:EPSG::1039';

    /**
     * New Zealand Vertical Datum 2016
     * Type: Vertical
     * Extent: New Zealand. Includes Antipodes Islands, Auckland Islands, Bounty Islands, Chatham Islands, Cambell
     * Island, Kermadec Islands, Raoul Island and Snares Islands
     * New Zealand quasigeoid 2016 which is defined by the application of the NZ geoid 2016 grid to NZGD2000
     * ellipsoidal heights. See transformation code 7840.
     */
    public const EPSG_NEW_ZEALAND_VERTICAL_DATUM_2016 = 'urn:ogc:def:datum:EPSG::1169';

    /**
     * Nivellement General Guyanais 1977
     * Type: Vertical
     * Extent: French Guiana - onshore
     * Mean sea level 1936 at Cayenne. Origin = marker BM35 on stone on St Francois battery, Cayenne, with defined
     * elevation of 1.64m above msl. NGG1977 height 0.00m is 1.96m above sounding datum defined at Cayenne in 1936 by
     * SHM.
     * Orthometric heights.
     */
    public const EPSG_NIVELLEMENT_GENERAL_GUYANAIS_1977 = 'urn:ogc:def:datum:EPSG::5153';

    /**
     * Nivellement General de Nouvelle Caledonie
     * Type: Vertical
     * Extent: New Caledonia - Grande Terre
     * Rivet AB01 established by SHOM (Service Hydrographique de la Marine)  in 1937 on the Quai des Volontaires in
     * Noumea. Height i: 1.885 metre above mean sea level.
     * Orthometric heights.
     */
    public const EPSG_NIVELLEMENT_GENERAL_DE_NOUVELLE_CALEDONIE = 'urn:ogc:def:datum:EPSG::5151';

    /**
     * Nivellement General de Nouvelle Caledonie 2008
     * Type: Vertical
     * Extent: New Caledonia - Belep, Grande Terre, Ile des Pins, Loyalty Islands (Lifou, Mare, Ouvea)
     * Normal heights.
     */
    public const EPSG_NIVELLEMENT_GENERAL_DE_NOUVELLE_CALEDONIE_2008 = 'urn:ogc:def:datum:EPSG::1255';

    /**
     * Nivellement General de Polynesie Francaise
     * Type: Vertical
     * Extent: French Polynesia - Society Islands - Bora Bora, Huahine, Maupiti, Moorea, Raiatea, Tahaa and Tahiti
     * The collection of heterogeneous levelling networks throughout the Society Islands of French Polynesia.
     */
    public const EPSG_NIVELLEMENT_GENERAL_DE_POLYNESIE_FRANCAISE = 'urn:ogc:def:datum:EPSG::5195';

    /**
     * Nivellement General de l'Algerie 2022
     * Type: Vertical
     * Extent: Algeria - onshore
     * Fundamental benchmark attached to the tide gauge at basin of Algiers old port with defined height of 1.1168m.
     * Orthometric heights.
     */
    public const EPSG_NIVELLEMENT_GENERAL_DE_LALGERIE_2022 = 'urn:ogc:def:datum:EPSG::1354';

    /**
     * Nivellement General de la Corse 1948
     * Type: Vertical
     * Extent: France - Corsica onshore
     * Mean sea level at Ajaccio between 1912 and 1937.
     * Replaced by IGN78 Corsica (datum 5120).
     */
    public const EPSG_NIVELLEMENT_GENERAL_DE_LA_CORSE_1948 = 'urn:ogc:def:datum:EPSG::5189';

    /**
     * Nivellement General de la France - IGN69
     * Type: Vertical
     * Extent: France - mainland onshore
     * Rivet number M.ac O-VIII on the Marseille tide gauge site, with the height fixed in 1897 at 1.661 metre above
     * mean sea level between February 2nd 1885 and January 1st 1897.
     * Uses Normal heights.
     */
    public const EPSG_NIVELLEMENT_GENERAL_DE_LA_FRANCE_IGN69 = 'urn:ogc:def:datum:EPSG::5119';

    /**
     * Nivellement General de la France - IGN78
     * Type: Vertical
     * Extent: France - Corsica onshore
     * Marker MM3 situated on the tide gauge site of Ajaccio. Height is 3.640 metre above mean sea level.
     * Uses Normal heights. Replaces NGC (datum code 5189).
     */
    public const EPSG_NIVELLEMENT_GENERAL_DE_LA_FRANCE_IGN78 = 'urn:ogc:def:datum:EPSG::5120';

    /**
     * Nivellement General de la France - Lallemand
     * Type: Vertical
     * Extent: France - mainland onshore
     * Rivet number M.ac O-VIII on the Marseille tide gauge site, with the height fixed in 1897 at 1.661 metre above
     * mean sea level between February 2nd 1885 and January 1st 1897.
     * Orthometric heights.
     */
    public const EPSG_NIVELLEMENT_GENERAL_DE_LA_FRANCE_LALLEMAND = 'urn:ogc:def:datum:EPSG::5118';

    /**
     * Nivellement General du Luxembourg 1995
     * Type: Vertical
     * Extent: Luxembourg
     * Reference point Wemperhardt defined as 528.030m above Normaal Amsterdams Peil (NAP). Datum at NAP is mean high
     * tide in 1684. Network adjusted in 1995.
     * Pseudo-orthometric heights.
     */
    public const EPSG_NIVELLEMENT_GENERAL_DU_LUXEMBOURG_1995 = 'urn:ogc:def:datum:EPSG::5172';

    /**
     * Nord Sahara 1959
     * Type: Geodetic
     * Extent: Algeria
     * Coordinates of primary network readjusted on ED50 datum and then transformed conformally to Clarke 1880 (RGS)
     * ellipsoid.
     * Adjustment includes Morocco and Tunisia but use only in Algeria. Within Algeria the adjustment is north of 32°N
     * but use has been extended southwards in many disconnected projects, some based on independent astro stations
     * rather than the geodetic network.
     */
    public const EPSG_NORD_SAHARA_1959 = 'urn:ogc:def:datum:EPSG::6307';

    /**
     * Normaal Amsterdams Peil
     * Type: Vertical
     * Extent: Netherlands
     * Mean high tide at Amsterdam in 1684. Onshore NAP is defined by the published heights of benchmarks and since
     * 2018 extended offshore defined by the application of the official transformation from ETRS89, RDNAPTRANS(TM).
     * Orthometric heights. From 2018, use has been extended from Netherlands onshore to Netherlands onshore and
     * offshore.
     */
    public const EPSG_NORMAAL_AMSTERDAMS_PEIL = 'urn:ogc:def:datum:EPSG::5109';

    /**
     * North American Datum 1927
     * Type: Geodetic
     * Extent: North and central America: Antigua and Barbuda - onshore. Bahamas - onshore plus offshore over internal
     * continental shelf only. Belize - onshore. British Virgin Islands - onshore. Canada onshore - Alberta, British
     * Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Northwest Territories, Nova Scotia, Nunavut,
     * Ontario, Prince Edward Island, Quebec, Saskatchewan and Yukon - plus offshore east coast. Cuba. El Salvador -
     * onshore. Guatemala - onshore. Honduras - onshore. Panama - onshore. Puerto Rico - onshore. Mexico - onshore plus
     * offshore east coast. Nicaragua - onshore. USA - Alabama, Alaska, Arizona, Arkansas, California, Colorado,
     * Connecticut, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine,
     * Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire,
     * New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode
     * Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia,
     * Wisconsin and Wyoming - plus offshore . US Virgin Islands - onshore
     * Fundamental point: Meade's Ranch. Latitude: 39°13'26.686"N, longitude: 98°32'30.506"W (of Greenwich).
     * In United States (USA) and Canada, replaced by North American Datum 1983 (NAD83) (code 6269) ; in Mexico,
     * replaced by Mexican Datum of 1993 (code 1042).
     */
    public const EPSG_NORTH_AMERICAN_DATUM_1927 = 'urn:ogc:def:datum:EPSG::6267';

    /**
     * North American Datum 1927 (1976)
     * Type: Geodetic
     * Extent: Canada - Ontario
     * Fundamental point: Meade's Ranch. Latitude: 39°13'26.686"N, longitude: 98°32'30.506"W (of Greenwich).
     * NAD27(76) used in Ontario for all maps at scale 1/20 000 and larger; elsewhere in Canada for selected purposes.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_1927_1976 = 'urn:ogc:def:datum:EPSG::6608';

    /**
     * North American Datum 1927 (CGQ77)
     * Type: Geodetic
     * Extent: Canada - Quebec
     * Fundamental point: Meade's Ranch. Latitude: 39°13'26.686"N, longitude: 98°32'30.506"W (of Greenwich).
     * NAD27 (CGQ77) used in Quebec for all maps at scale 1/20 000 and larger; generally for maps issued by the Quebec
     * cartography office whose reference system is CGQ77.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_1927_CGQ77 = 'urn:ogc:def:datum:EPSG::6609';

    /**
     * North American Datum 1983
     * Type: Geodetic
     * Extent: North America: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador;
     * Northwest Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon. Puerto
     * Rico. USA - Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida; Georgia;
     * Hawaii; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan;
     * Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York;
     * North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina; South Dakota;
     * Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming. US Virgin Islands.
     * British Virgin Islands
     * NAD83 Doppler Transit stations in NWL 9D were aligned with the BIH Conventional Terrestrial Reference Frame
     * (BTS) at epoch 1984.0 using an internationally adopted transformation. NAD83 is now known to be non-geocentric
     * by about 2.2 meters.
     * Although the 1986 adjustment included connections to Greenland and Mexico, it has not been adopted there. In
     * Canada and US, replaced NAD27.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_1983 = 'urn:ogc:def:datum:EPSG::6269';

    /**
     * North American Datum of 1983 (CSRS) version 2
     * Type: Geodetic
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined at reference epoch 1997.00 by a transformation from ITRF96 (see transformation code 8259). The frame is
     * kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
     * Published 1998-01-01; adopted by the Canadian federal government and the provincial governments of Alberta,
     * Saskatchewan, Manitoba, Quebec, New Brunswick and Prince Edward Island. Replaces NAD83(CSRS96). Replaced by
     * NAD83(CSRS)v3.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_CSRS_VERSION_2 = 'urn:ogc:def:datum:EPSG::1193';

    /**
     * North American Datum of 1983 (CSRS) version 3
     * Type: Geodetic
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined at reference epoch 1997.00 by a transformation from ITRF97 (see transformation code 8260). The frame is
     * kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
     * Published 1999-01-01; adopted by the Canadian federal government (2000) and the provincial governments of
     * British Columbia (CRD in 2000, all Victoria Island 2005), Ontario (2008) and Nova Scotia (2000). Replaces
     * NAD83(CSRS)v2. Replaced by NAD83(CSRS)v4.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_CSRS_VERSION_3 = 'urn:ogc:def:datum:EPSG::1194';

    /**
     * North American Datum of 1983 (CSRS) version 4
     * Type: Geodetic
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined at reference epoch 2002.00 by a transformation from ITRF2000 (see transformation code 8261). The frame
     * is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
     * Published 2002-01-01; adopted by the Canadian federal government (2002) and the provincial governments of
     * British Columbia (for mainland only, not Victoria Island) (2005) and Alberta (2004). Replaces NAD83(CSRS)v3.
     * Replaced by NAD83(CSRS)v5.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_CSRS_VERSION_4 = 'urn:ogc:def:datum:EPSG::1195';

    /**
     * North American Datum of 1983 (CSRS) version 5
     * Type: Geodetic
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined at reference epoch 2006.00 by a transformation from ITRF2005 (see transformation code 9227). The frame
     * is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
     * Published 2007-01-01; adopted by the Canadian federal government in 2007. Replaces NAD83(CSRS)v4. Replaced by
     * NAD83(CSRS)v6.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_CSRS_VERSION_5 = 'urn:ogc:def:datum:EPSG::1196';

    /**
     * North American Datum of 1983 (CSRS) version 6
     * Type: Geodetic
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined at reference epoch 2010.00 by a transformation from ITRF2008 (see transformation code 8264). The frame
     * is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
     * Published 2010-01-01; adopted by the Canadian government (2012) and the provincial governments of Manitoba
     * (2014), Ontario (2013), Prince Edward Island (2014), Nova Scotia (2014) and Newfoundland (2012). Replaces
     * NAD83(CSRSv5). Replaced by NAD83(CSRS)v7.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_CSRS_VERSION_6 = 'urn:ogc:def:datum:EPSG::1197';

    /**
     * North American Datum of 1983 (CSRS) version 7
     * Type: Geodetic
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined at reference epoch 2010.00 by a transformation from ITRF2014 (see transformation code 8265). The frame
     * is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
     * Published 2017-05-01; adopted by the Canadian federal government (2017) and the provincial governments of
     * Alberta (2021) and Prince Edward Island (2020). Replaces NAD83(CSRS)v6. Replaced by NAD83(CSRS)v8.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_CSRS_VERSION_7 = 'urn:ogc:def:datum:EPSG::1198';

    /**
     * North American Datum of 1983 (CSRS) version 8
     * Type: Geodetic
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined at reference epoch 2010.00 by a transformation from ITRF2020 (see transformation code 10415). The frame
     * is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
     * Published 2022-11-27; adopted by the Canadian federal government (2023). Replaces NAD83(CSRS)v7.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_CSRS_VERSION_8 = 'urn:ogc:def:datum:EPSG::1365';

    /**
     * North American Datum of 1983 (CSRS96)
     * Type: Geodetic
     * Extent: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest
     * Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon
     * Defined at epoch 1988.0 by a transformation from ITRF92, the definition superseded by a transformation from
     * ITRF93 and then by a transformation from ITRF94. (See transformation codes 8256-58).
     * Adopted by the Canadian federal government from 1996-01-01. Replaces NAD83 [sometimes called NAD83(Original)].
     * Replaced by NAD83(CSRS)v2.
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_CSRS96 = 'urn:ogc:def:datum:EPSG::1192';

    /**
     * North American Datum of 1983 (MARP00)
     * Type: Geodetic
     * Extent: Guam, Northern Mariana Islands and Palau;
     * Defined by a time-dependent seven parameter transformation of ITRF2000 3D geocentric Cartesian coordinates and
     * velocities at reference epoch 1993.62, aligned to the Mariana plate at other epochs based on an Euler pole
     * rotation.
     * Replaces NAD83(HARN) (GGN93) and NAD83(FBN) in Guam. Replaced by NAD83(MA11).
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_MARP00 = 'urn:ogc:def:datum:EPSG::1221';

    /**
     * North American Datum of 1983 (PACP00)
     * Type: Geodetic
     * Extent: American Samoa, Marshall Islands, USA - Hawaii, United States minor outlying islands;
     * Defined by a time-dependent seven parameter transformation of ITRF2000 3D geocentric Cartesian coordinates and
     * velocities at reference epoch 1993.62, aligned to the Pacific plate at other epochs based on an Euler pole
     * rotation.
     * Replaces NAD83(HARN) and NAD83(FBN) in Hawaii and American Samoa. Replaced by NAD83(PA11).
     */
    public const EPSG_NORTH_AMERICAN_DATUM_OF_1983_PACP00 = 'urn:ogc:def:datum:EPSG::1249';

    /**
     * North American Vertical Datum 1988
     * Type: Vertical
     * Extent: Mexico - onshore. USA - CONUS and Alaska - onshore - Alabama; Alaska; Arizona; Arkansas; California;
     * Colorado; Connecticut; Delaware; Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana;
     * Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New
     * Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania;
     * Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West
     * Virginia; Wisconsin; Wyoming
     * Mean water level 1970-1983 at Pointe-au-Père (Father's Point) and 1984-1988 at Rimouski, Quebec. Benchmark
     * 1250-G = 6.273m.
     * Helmert orthometric heights.
     */
    public const EPSG_NORTH_AMERICAN_VERTICAL_DATUM_1988 = 'urn:ogc:def:datum:EPSG::5103';

    /**
     * North Rona
     * Type: Vertical
     * Extent: UK - Great Britain - Scotland - North Rona onshore
     * Orthometric heights.
     */
    public const EPSG_NORTH_RONA = 'urn:ogc:def:datum:EPSG::5143';

    /**
     * Northern Marianas Vertical Datum of 2003
     * Type: Vertical
     * Extent: Northern Mariana Islands - onshore - Rota, Saipan and Tinian
     * Mean sea level at Tanapag harbor, Saipan. Benchmark 1633227 TIDAL UH-2C = 1.657m relative to National Tidal
     * Datum Epoch 1983-2001. Transferred to Rota (East Harbor, BM TIDAL 3 = 1.482m) and Tinian (Harbor BM TIDAL 1 =
     * 2.361m).
     * Replaces all earlier vertical datums on these islands.
     */
    public const EPSG_NORTHERN_MARIANAS_VERTICAL_DATUM_OF_2003 = 'urn:ogc:def:datum:EPSG::1119';

    /**
     * Norway Normal Null 1954
     * Type: Vertical
     * Extent: Norway - onshore
     * MSL defined by regression at 7 gauges with between 17 and 67 years observations.
     * Includes initial NN1954 system and NNN1957 system. Former name retained. Normal-orthometric heights. Replaced by
     * NN2000.
     */
    public const EPSG_NORWAY_NORMAL_NULL_1954 = 'urn:ogc:def:datum:EPSG::5174';

    /**
     * Norway Normal Null 2000
     * Type: Vertical
     * Extent: Norway - onshore
     * Adjustment is referenced to mean high tide at Amsterdams Peil in 1684. To account for land level movements
     * caused by isostatic rebound, heights are reduced to epoch 2000.0 using values computed from the NKG2005LU uplift
     * model.
     * Replaces NN54. Uses Normal heights.
     */
    public const EPSG_NORWAY_NORMAL_NULL_2000 = 'urn:ogc:def:datum:EPSG::1096';

    /**
     * Norwegian Chart Datum
     * Type: Vertical
     * Extent: Norway (offshore) and Svalbard and Jan Mayen (offshore)
     * LAT (sum of all harmonic constituents) with an added safety margin in areas where low water levels frequently
     * deviate from LAT. The safety margin is 20 cm from Utsira to the Swedish border and 30 cm in the inner part of
     * the Oslofjord (north of Drøbak).
     * Prior to 2000-01-01 the definition of chart datum was Z0 = M2 + S2 + N2 + K2 + K1 + ½Sa plus safety margins (10
     * cm north of Hordaland, 20 cm in Hordaland, 30 cm from Rogaland to the Swedish border and 40 cm in the inner
     * parts of the Oslofjord).
     */
    public const EPSG_NORWEGIAN_CHART_DATUM = 'urn:ogc:def:datum:EPSG::1301';

    /**
     * Not specified (based on Airy 1830 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_AIRY_1830_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6001';

    /**
     * Not specified (based on Airy Modified 1849 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_AIRY_MODIFIED_1849_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6002';

    /**
     * Not specified (based on Australian National Spheroid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_AUSTRALIAN_NATIONAL_SPHEROID = 'urn:ogc:def:datum:EPSG::6003';

    /**
     * Not specified (based on Average Terrestrial System 1977 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_AVERAGE_TERRESTRIAL_SYSTEM_1977_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6041';

    /**
     * Not specified (based on Bessel 1841 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_BESSEL_1841_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6004';

    /**
     * Not specified (based on Bessel Modified ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_BESSEL_MODIFIED_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6005';

    /**
     * Not specified (based on Bessel Namibia ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_BESSEL_NAMIBIA_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6006';

    /**
     * Not specified (based on Clarke 1858 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_CLARKE_1858_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6007';

    /**
     * Not specified (based on Clarke 1866 Authalic Sphere)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_CLARKE_1866_AUTHALIC_SPHERE = 'urn:ogc:def:datum:EPSG::6052';

    /**
     * Not specified (based on Clarke 1866 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_CLARKE_1866_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6008';

    /**
     * Not specified (based on Clarke 1880 (Arc) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_CLARKE_1880_ARC_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6013';

    /**
     * Not specified (based on Clarke 1880 (Benoit) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_CLARKE_1880_BENOIT_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6010';

    /**
     * Not specified (based on Clarke 1880 (IGN) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_CLARKE_1880_IGN_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6011';

    /**
     * Not specified (based on Clarke 1880 (RGS) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_CLARKE_1880_RGS_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6012';

    /**
     * Not specified (based on Clarke 1880 (SGA 1922) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_CLARKE_1880_SGA_1922_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6014';

    /**
     * Not specified (based on Clarke 1880 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_CLARKE_1880_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6034';

    /**
     * Not specified (based on Everest (1830 Definition) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_EVEREST_1830_DEFINITION_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6042';

    /**
     * Not specified (based on Everest 1830 (1937 Adjustment) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_EVEREST_1830_1937_ADJUSTMENT_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6015';

    /**
     * Not specified (based on Everest 1830 (1962 Definition) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_EVEREST_1830_1962_DEFINITION_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6044';

    /**
     * Not specified (based on Everest 1830 (1967 Definition) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_EVEREST_1830_1967_DEFINITION_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6016';

    /**
     * Not specified (based on Everest 1830 (1975 Definition) ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_EVEREST_1830_1975_DEFINITION_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6045';

    /**
     * Not specified (based on Everest 1830 Modified ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_EVEREST_1830_MODIFIED_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6018';

    /**
     * Not specified (based on GEM 10C ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_GEM_10C_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6031';

    /**
     * Not specified (based on GRS 1967 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_GRS_1967_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6036';

    /**
     * Not specified (based on GRS 1980 Authalic Sphere)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_GRS_1980_AUTHALIC_SPHERE = 'urn:ogc:def:datum:EPSG::6047';

    /**
     * Not specified (based on GRS 1980 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_GRS_1980_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6019';

    /**
     * Not specified (based on Helmert 1906 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_HELMERT_1906_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6020';

    /**
     * Not specified (based on Hughes 1980 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_HUGHES_1980_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6054';

    /**
     * Not specified (based on Indonesian National Spheroid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_INDONESIAN_NATIONAL_SPHEROID = 'urn:ogc:def:datum:EPSG::6021';

    /**
     * Not specified (based on International 1924 Authalic Sphere)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_INTERNATIONAL_1924_AUTHALIC_SPHERE = 'urn:ogc:def:datum:EPSG::6053';

    /**
     * Not specified (based on International 1924 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_INTERNATIONAL_1924_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6022';

    /**
     * Not specified (based on Krassowsky 1940 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_KRASSOWSKY_1940_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6024';

    /**
     * Not specified (based on NWL 9D ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_NWL_9D_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6025';

    /**
     * Not specified (based on OSU86F ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_OSU86F_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6032';

    /**
     * Not specified (based on OSU91A ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_OSU91A_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6033';

    /**
     * Not specified (based on Plessis 1817 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_PLESSIS_1817_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6027';

    /**
     * Not specified (based on Struve 1860 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_STRUVE_1860_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6028';

    /**
     * Not specified (based on WGS 72 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_WGS_72_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6043';

    /**
     * Not specified (based on WGS 84 ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_WGS_84_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6030';

    /**
     * Not specified (based on War Office ellipsoid)
     * Type: Geodetic
     * Extent: World
     * Included for coordinate reference systems where datum is unknown.
     * @deprecated
     */
    public const EPSG_NOT_SPECIFIED_BASED_ON_WAR_OFFICE_ELLIPSOID = 'urn:ogc:def:datum:EPSG::6029';

    /**
     * Nouakchott 1965
     * Type: Geodetic
     * Extent: Mauritania - coastal area south of Cape Timiris
     * Nouakchott astronomical point.
     * Triangulation limited to environs of Nouakchott. Extended in 1982 by satellite translocation from a single
     * station "Ruines" to support Syledis chain for offshore operations. Replaced by Mauritania 1999 (datum code
     * 6602).
     */
    public const EPSG_NOUAKCHOTT_1965 = 'urn:ogc:def:datum:EPSG::6680';

    /**
     * Nouvelle Triangulation Francaise
     * Type: Geodetic
     * Extent: France - onshore - mainland and Corsica
     * Fundamental point: Pantheon. Latitude: 48°50'46.522"N, longitude: 2°20'48.667"E (of Greenwich).
     */
    public const EPSG_NOUVELLE_TRIANGULATION_FRANCAISE = 'urn:ogc:def:datum:EPSG::6275';

    /**
     * Nouvelle Triangulation Francaise (Paris)
     * Type: Geodetic
     * Extent: France - onshore - mainland and Corsica
     * Fundamental point: Pantheon. Latitude: 54.273618g N, longitude: 0.0106921g E (of Paris).
     */
    public const EPSG_NOUVELLE_TRIANGULATION_FRANCAISE_PARIS = 'urn:ogc:def:datum:EPSG::6807';

    /**
     * OS (SN) 1980
     * Type: Geodetic
     * Extent: Ireland - onshore. UK - onshore - England; Scotland; Wales; Northern Ireland. Isle of Man
     * Fundamental point: Herstmonceux. Latitude: 50°51'55.271"N, longitude: 0°20'45.882"E (of Greenwich).
     */
    public const EPSG_OS_SN_1980 = 'urn:ogc:def:datum:EPSG::6279';

    /**
     * OSGB 1970 (SN)
     * Type: Geodetic
     * Extent: UK - Great Britain - England and Wales onshore, Scotland onshore and Western Isles nearshore including
     * Sea of the Hebrides and The Minch; Isle of Man onshore
     * Fundamental point: Herstmonceux. Latitude: 50°51'55.271"N, longitude: 0°20'45.882"E (of Greenwich).
     */
    public const EPSG_OSGB_1970_SN = 'urn:ogc:def:datum:EPSG::6278';

    /**
     * OSNI 1952
     * Type: Geodetic
     * Extent: UK - Northern Ireland (Ulster) - onshore
     * Position fixed to the coordinates from the 19th century Principle Triangulation of station Divis. Scale and
     * orientation controlled by position of Principle Triangulation stations Knocklayd and Trostan.
     * Replaced by Geodetic Datum of 1965 alias 1975 Mapping Adjustment or TM75 (datum code 6300).
     */
    public const EPSG_OSNI_1952 = 'urn:ogc:def:datum:EPSG::6188';

    /**
     * Observatario
     * Type: Geodetic
     * Extent: Mozambique - south
     * Fundamental point: Campos Rodrigues observatory, Maputo.
     * Replaced by transformation to Tete datum (datum code 6127).
     */
    public const EPSG_OBSERVATARIO = 'urn:ogc:def:datum:EPSG::6129';

    /**
     * Ocotepeque 1935
     * Type: Geodetic
     * Extent: Costa Rica; El Salvador; Guatemala; Honduras; Nicaragua
     * Fundamental point: Base Norte. Latitude: 14°26'20.168"N, longitude: 89°11'33.964"W.
     * Replaced in Costa Rica by Costa Rica 2005 (CR05) from March 2007 and replaced in El Salvador by SIRGAS_ES2007
     * from August 2007.
     */
    public const EPSG_OCOTEPEQUE_1935 = 'urn:ogc:def:datum:EPSG::1070';

    /**
     * Old Hawaiian
     * Type: Geodetic
     * Extent: USA - Hawaii - main islands onshore
     * Fundamental point: Oahu West Base Astro.  Latitude: 21°18'13.89"N, longitude 157°50'55.79"W (of Greenwich)
     * Hawaiian Islands were never on NAD27 but rather on Old Hawaiian Datum. NADCON conversion program provides
     * transformation from Old Hawaiian Datum to NAD83 (original 1986 realization) but making the transformation appear
     * to user as if from NAD27.
     */
    public const EPSG_OLD_HAWAIIAN = 'urn:ogc:def:datum:EPSG::6135';

    /**
     * Oman National Geodetic Datum 2014
     * Type: Geodetic
     * Extent: Oman
     * 20 stations of the Oman primary network tied to ITRF2008 at epoch 2013.15.
     * Replaces WGS 84 (G873). Replaced by ONGD17.
     */
    public const EPSG_OMAN_NATIONAL_GEODETIC_DATUM_2014 = 'urn:ogc:def:datum:EPSG::1147';

    /**
     * Oman National Geodetic Datum 2017
     * Type: Geodetic
     * Extent: Oman
     * Oman primary network of 39 stations tied to ITRF2014 at epoch 2017.24.
     * Replaces ONGD14 from March 2019.
     */
    public const EPSG_OMAN_NATIONAL_GEODETIC_DATUM_2017 = 'urn:ogc:def:datum:EPSG::1263';

    /**
     * One Tree Point 1964
     * Type: Vertical
     * Extent: New Zealand - North Island - One Tree Point vertical CRS area
     * MSL at Whangarei harbour 1960-1963.
     */
    public const EPSG_ONE_TREE_POINT_1964 = 'urn:ogc:def:datum:EPSG::5165';

    /**
     * Ordnance Datum Newlyn
     * Type: Vertical
     * Extent: UK - Great Britain onshore - England and Wales - mainland; Scotland - mainland and Inner Hebrides
     * Mean Sea Level at Newlyn between 1915 and 1921. Initially realised through 1921 and then 1956 levelling network
     * adjustments. From 2002 redefined to be realised through OSGM geoid models.
     * Orthometric heights.
     */
    public const EPSG_ORDNANCE_DATUM_NEWLYN = 'urn:ogc:def:datum:EPSG::5101';

    /**
     * Ordnance Datum Newlyn (Offshore)
     * Type: Vertical
     * Extent: UK - offshore between 2km from shore and boundary of UKCS within 49°45'N to 61°N and 9°W to 2°E
     * Defined by OSGM geoid model.
     * Extension of Ordnance Datum Newlyn offshore through geoid model. Orthometric heights.
     */
    public const EPSG_ORDNANCE_DATUM_NEWLYN_OFFSHORE = 'urn:ogc:def:datum:EPSG::1164';

    /**
     * Ordnance Datum Newlyn (Orkney Isles)
     * Type: Vertical
     * Extent: UK - Great Britain - Scotland - Orkney Islands onshore
     * Connected to Newlyn datum by triangulation from the British mainland. Initially realised through levelling
     * network adjustment, from 2002 redefined to be realised through OSGM geoid model.
     * Considered as separate from Newlyn because the accuracy of the trigonometric connection across the Pentland
     * Firth does not meet geodetic levelling specifications. Orthometric heights.
     */
    public const EPSG_ORDNANCE_DATUM_NEWLYN_ORKNEY_ISLES = 'urn:ogc:def:datum:EPSG::5138';

    /**
     * Ordnance Survey of Great Britain 1936
     * Type: Geodetic
     * Extent: UK - offshore to boundary of UKCS within 49°45'N to 61°N and 9°W to 2°E; onshore Great Britain
     * (England, Wales and Scotland). Isle of Man onshore
     * Prior to 2002 fundamental point: Herstmonceux, Latitude: 50°51'55.271"N, longitude: 0°20'45.882"E,
     * triangulation adjustment started 1936, completed 1962. From April 2002 the datum is defined through the
     * application of the OSTN transformation from ETRS89.
     * The average accuracy of OSTN compared to the old triangulation network (down to 3rd order) is 0.1m. With the
     * introduction of OSTN15, the area for OGSB36 has effectively been extended from Britain to cover the adjacent UK
     * Continental Shelf.
     */
    public const EPSG_ORDNANCE_SURVEY_OF_GREAT_BRITAIN_1936 = 'urn:ogc:def:datum:EPSG::6277';

    /**
     * Ostend
     * Type: Vertical
     * Extent: Belgium - onshore
     * Mean low water at Ostend 1855-78 transferred to benchmark GIKMN at Uccle.
     * Realized through the second general levelling (DNG or TAW) 1981-1999.
     */
    public const EPSG_OSTEND = 'urn:ogc:def:datum:EPSG::5110';

    /**
     * Ostenfeld  Intermediate Datum
     * Type: Geodetic
     * Extent: Denmark - onshore northern Schleswig and surrounding islands (i.e. Jutland south of the pre-1920 border
     * near the Kongea river)
     * Origin of historic system is near the German village Ostenfeld.  This Danish reconstruction defined/derived
     * through inversion of an older transformation.
     * Created in 2022 to support intermediate CRS OS-IRF in the transformation of coordinates between the historic
     * Ostenfeld system of Prussia and ETRS89. The data are reconstructions based on information synthesized in
     * historical empirical transformations.
     */
    public const EPSG_OSTENFELD_INTERMEDIATE_DATUM = 'urn:ogc:def:datum:EPSG::1350';

    /**
     * OxWo08 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Oxford to Worcester
     * Defined through the application of the OxWo08 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS OxWo08-IRF in the emulation of the OxWo08 Snake map projection.
     */
    public const EPSG_OXWO08_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1344';

    /**
     * PDO Height Datum 1993
     * Type: Vertical
     * Extent: Oman - onshore. Includes Musandam and the Kuria Muria (Al Hallaniyah) islands
     * Misclosure between Muscat and Salalah less than .5 meters with differences from of up to 5 meters from old Fahud
     * Datum. The PHD93 adjustment was initially known as the Spine. Replaces Fahud Vertical Datum (code 5124) from
     * 1993.
     */
    public const EPSG_PDO_HEIGHT_DATUM_1993 = 'urn:ogc:def:datum:EPSG::5123';

    /**
     * PDO Survey Datum 1993
     * Type: Geodetic
     * Extent: Oman - onshore. Includes Musandam and the Kuria Muria (Al Hallaniyah) islands
     * Adjustment best fitted to Fahud network.
     * Replaces Fahud datum (code 6232). Maximum differences to Fahud adjustment are 20 metres.
     */
    public const EPSG_PDO_SURVEY_DATUM_1993 = 'urn:ogc:def:datum:EPSG::6134';

    /**
     * PNG08
     * Type: Vertical
     * Extent: Papua New Guinea - between 0°N and 12°S and 140°E and 158°E
     * Mean sea level at 8 tide gauges around PNG, defined through application of PNG08 geoid model (transformation
     * code 7655) to PNG94 (CRS code 5545).
     */
    public const EPSG_PNG08 = 'urn:ogc:def:datum:EPSG::1149';

    /**
     * Palestine 1923
     * Type: Geodetic
     * Extent: Israel - onshore; Jordan; Palestine Territory - onshore
     * Fundamental point: Point 82'M  Jerusalem. Latitude: 31°44' 2.749"N, longitude: 35°12'43.490"E (of Greenwich).
     */
    public const EPSG_PALESTINE_1923 = 'urn:ogc:def:datum:EPSG::6281';

    /**
     * Pampa del Castillo
     * Type: Geodetic
     * Extent: Argentina - Chibut province south of approximately 42°30'S and Santa Cruz province north of
     * approximately 50°20'S
     * Replaced by Campo Inchauspe (code 6221) for topographic mapping, use for oil exploration and production in Golfo
     * San Jorge basin (44°S to 47.5°S) continues.
     */
    public const EPSG_PAMPA_DEL_CASTILLO = 'urn:ogc:def:datum:EPSG::6161';

    /**
     * Panama-Colon 1911
     * Type: Geodetic
     * Extent: Panama - onshore
     * Fundamental point: Balboa Hill. Latitude: 09°04'57.637"N, longtitude: 79°43'50.313"W.
     * Reports of the existence of an Ancon datum are probably erroneous, considering that the origin of the
     * Panamá-Colón Datum of 1911 is at Balboa Hill and the access road up the hill is from the town of Ancon, Canal
     * Zone.
     */
    public const EPSG_PANAMA_COLON_1911 = 'urn:ogc:def:datum:EPSG::1072';

    /**
     * Papua New Guinea Geodetic Datum 1994
     * Type: Geodetic
     * Extent: Papua New Guinea. Includes Bismark archipelago, Louisade archipelago, Admiralty Islands, d'Entrecasteaux
     * Islands, northern Solomon Islands, Trobriand Islands, New Britain, New Ireland, Woodlark, and associated islands
     * ITRF92 at epoch 1994.0.
     * Adopted 1996. Coincident with WGS 84 in 1994 but rapidly divergent due to significant tectonic motion in PNG.
     */
    public const EPSG_PAPUA_NEW_GUINEA_GEODETIC_DATUM_1994 = 'urn:ogc:def:datum:EPSG::1076';

    /**
     * Parametry Zemli 1990
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of stations of the satellite geodetic network (SGN) in Russia at epoch 1990.0.
     * Replaced by PZ-90.02 from 2007-09-20.
     */
    public const EPSG_PARAMETRY_ZEMLI_1990 = 'urn:ogc:def:datum:EPSG::6740';

    /**
     * Parametry Zemli 1990.02
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of 33 stations of the satellite geodetic network (SGN) in Russia and Antarctica
     * adjusted to a subset of 14 IGS stations in Russia at epoch 2002.0. The IGS station coordinates are considered to
     * be equivalent to ITRF2000.
     * Replaces PZ-90 from 2007-09-20. Replaced by PZ-90.11 from 2014-01-15.
     */
    public const EPSG_PARAMETRY_ZEMLI_1990_02 = 'urn:ogc:def:datum:EPSG::1157';

    /**
     * Parametry Zemli 1990.11
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of 33 stations of the satellite geodetic network (SGN) in Russia and Antarctica
     * adjusted to a subset of 14 IGS stations in Russia at epoch 2010.0. The IGS station coordinates are considered to
     * be equivalent to ITRF2008.
     * Replaces PZ-90.02 from 2014-01-15.
     */
    public const EPSG_PARAMETRY_ZEMLI_1990_11 = 'urn:ogc:def:datum:EPSG::1158';

    /**
     * Peru96
     * Type: Geodetic
     * Extent: Peru
     * Densification of SIRGAS95 network (ITRF94 at epoch 1995.4) in Peru, consisting of 47 passive geodetic stations
     * and 3 continuous recording GPS stations.
     * Densification of SIRGAS 1995 within Peru. Replaces PSAD56 (datum code 6248) in Peru.
     */
    public const EPSG_PERU96 = 'urn:ogc:def:datum:EPSG::1067';

    /**
     * Petrels 1972
     * Type: Geodetic
     * Extent: Antarctica - Adelie Land - Petrels island
     * Fundamental point: Astro station DZ on Ile de Petrels. Latitude: 66°40'00"S, longitude: 140°00'46"E (of
     * Greenwich).
     */
    public const EPSG_PETRELS_1972 = 'urn:ogc:def:datum:EPSG::6636';

    /**
     * Philippine Reference System 1992
     * Type: Geodetic
     * Extent: Philippines
     * Fundamental point: Balacan. Latitude: 13°33'41.000"N, longitude: 121°52'03.000"E (of Greenwich),
     * geoid-ellipsoid separation 0.34m.
     * Replaces Luzon 1911 datum (code 6253).
     */
    public const EPSG_PHILIPPINE_REFERENCE_SYSTEM_1992 = 'urn:ogc:def:datum:EPSG::6683';

    /**
     * Phoenix Islands 1966
     * Type: Geodetic
     * Extent: Kiribati - Phoenix Islands: Kanton, Orona, McKean Atoll, Birnie Atoll, Phoenix Seamounts.
     */
    public const EPSG_PHOENIX_ISLANDS_1966 = 'urn:ogc:def:datum:EPSG::6716';

    /**
     * Pico de las Nieves 1968
     * Type: Geodetic
     * Extent: Spain - Canary Islands onshore
     * Pico de las Nieves mountain, Gran Canaria. The fundamental point is a different station to that for PN84.
     * Replaced by PN84 only on western islands (El Hierro, La Gomera, La Palma and Tenerife). Both PN68 and PN84
     * replaced by REGCAN95.
     */
    public const EPSG_PICO_DE_LAS_NIEVES_1968 = 'urn:ogc:def:datum:EPSG::1286';

    /**
     * Pico de las Nieves 1984
     * Type: Geodetic
     * Extent: Spain - Canary Islands - El Hierro, La Gomera, La Palma and Tenerife - onshore
     * Pico de las Nieves mountain, Gran Canaria. The fundamental point is a different station to that for PN68.
     * Replaces Pico de las Nieves 1968 (PN68) only on western islands (El Hierro, La Gomera, La Palma and Tenerife).
     * Replaced by REGCAN95.
     */
    public const EPSG_PICO_DE_LAS_NIEVES_1984 = 'urn:ogc:def:datum:EPSG::6728';

    /**
     * Piraeus Harbour 1986
     * Type: Vertical
     * Extent: Greece - onshore
     * MSL determined during 1986.
     */
    public const EPSG_PIRAEUS_HARBOUR_1986 = 'urn:ogc:def:datum:EPSG::5115';

    /**
     * Pitcairn 1967
     * Type: Geodetic
     * Extent: Pitcairn - Pitcairn Island
     * Fundamental point: Pitcairn Astro. Latitude: 25°04'06.87"S, longitude: 130°06'47.83"W (of Greenwich).
     * Replaced by Pitcairn 2006.
     */
    public const EPSG_PITCAIRN_1967 = 'urn:ogc:def:datum:EPSG::6729';

    /**
     * Pitcairn 2006
     * Type: Geodetic
     * Extent: Pitcairn - Pitcairn Island
     * Fundamental point: Pitcairn Astro. Latitude: 25°04'06.7894"S, longitude: 130°06'46.6816"W (of Greenwich),
     * derived by single point GPS oberservations.
     * Replaces Pitcairn 1967.
     */
    public const EPSG_PITCAIRN_2006 = 'urn:ogc:def:datum:EPSG::6763';

    /**
     * Point 58
     * Type: Geodetic
     * Extent: Senegal - central, Mali - southwest, Burkina Faso - central, Niger - southwest, Nigeria - north, Chad -
     * central. All in proximity to the parallel of latitude of 12°N
     * Fundamental point: Point 58. Latitude: 12°52'44.045"N, longitude: 3°58'37.040"E (of Greenwich).
     * Used as the basis for computation of the 12th Parallel traverse conducted 1966-70 from Senegal to Chad and
     * connecting to the Blue Nile 1958 (Adindan) triangulation in Sudan.
     */
    public const EPSG_POINT_58 = 'urn:ogc:def:datum:EPSG::6620';

    /**
     * Pointe Geologie Perroud 1950
     * Type: Geodetic
     * Extent: Antarctica - Adelie Land - coastal area between 136°E and 142°E
     * Fundamental point: Astro station G.0 on Pointe Geologie. Latitude: 66°39'30"S, longitude: 140°01'00"E (of
     * Greenwich).
     */
    public const EPSG_POINTE_GEOLOGIE_PERROUD_1950 = 'urn:ogc:def:datum:EPSG::6637';

    /**
     * Ponta Delgada
     * Type: Vertical
     * Extent: Portugal - eastern Azores - Sao Miguel island onshore
     * Mean Sea Level during 1991 at Ponta Delgada.
     * Orthometric heights.
     */
    public const EPSG_PONTA_DELGADA = 'urn:ogc:def:datum:EPSG::1110';

    /**
     * Poolbeg
     * Type: Vertical
     * Extent: Ireland - onshore. UK - Northern Ireland (Ulster) - onshore
     * Low water mark of the spring tide on the 8 April 1837 at Poolbeg Lighthouse, Dublin.
     * Topographic mapping before 1956 in Northern Ireland and 1970 in the Republic of Ireland. Replaced by Belfast
     * Lough and Malin Head (datum codes 5130-31).
     */
    public const EPSG_POOLBEG = 'urn:ogc:def:datum:EPSG::5152';

    /**
     * Port Moresby 1996
     * Type: Vertical
     * Extent: Papua New Guinea - onshore - Gulf province east of 144°24'E, Central province and National Capital
     * District
     * BM198 (adjacent to the Port Moresby tide gauge) height of 3.02 above MSL as determined by CSIRO in 1990.
     * Propagated through bilinear interpolation of EGM96 geoid model (transformation code 10084) reduced by offset of
     * -1.58m.
     * Offset has been determined by static GNSS estimation of ellipsoid height of BM198.
     */
    public const EPSG_PORT_MORESBY_1996 = 'urn:ogc:def:datum:EPSG::1171';

    /**
     * Port Moresby 2008
     * Type: Vertical
     * Extent: Papua New Guinea - onshore - Gulf province east of 144°24'E, Central province and National Capital
     * District
     * BM198 (adjacent to the Port Moresby tide gauge) height of 3.02 above MSL as determined by CSIRO in 1990.
     * Propagated through bilinear interpolation of EGM2008 geoid model (transformation code 3858 or 3859) reduced by
     * offset of -0.93m.
     * Offset has been determined by static GNSS estimation of ellipsoid height of BM198 validated to a precision of 10
     * cm by short period tidal observations at Kerema wharf in 2010.
     */
    public const EPSG_PORT_MORESBY_2008 = 'urn:ogc:def:datum:EPSG::1172';

    /**
     * Porto Santo 1936
     * Type: Geodetic
     * Extent: Portugal - Madeira, Porto Santo and Desertas islands - onshore
     * SE Base on Porto Santo island.
     * Replaced by 1995 adjustment (datum code 6663). For Selvagens see Selvagem Grande (code 6616).
     */
    public const EPSG_PORTO_SANTO_1936 = 'urn:ogc:def:datum:EPSG::6615';

    /**
     * Porto Santo 1995
     * Type: Geodetic
     * Extent: Portugal - Madeira, Porto Santo and Desertas islands - onshore
     * SE Base on Porto Santo island. Origin and orientation constrained to those of the 1936 adjustment.
     * Classical and GPS observations. Replaces 1936 adjustment (datum code 6615). For Selvagens see Selvagem Grande
     * (datum code 6616).
     */
    public const EPSG_PORTO_SANTO_1995 = 'urn:ogc:def:datum:EPSG::6663';

    /**
     * Posiciones Geodesicas Argentinas 1994
     * Type: Geodetic
     * Extent: Argentina
     * WGS 84 coordinates at time of survey of a geodetic network of 127 points defining the National Geodetic System
     * (Sistema Geodésico Nacional). Surveyed between February and April 1993 and between March and May 1994.
     * Adopted as defining the National Geodetic Reference Network from 9th May 1997. Technically, but not legally,
     * replaced by POSGAR 98 (datum code 6190) until 15th May 2009 when legally replaced by POSGAR 2007 (datum code
     * 1062).
     */
    public const EPSG_POSICIONES_GEODESICAS_ARGENTINAS_1994 = 'urn:ogc:def:datum:EPSG::6694';

    /**
     * Posiciones Geodesicas Argentinas 1998
     * Type: Geodetic
     * Extent: Argentina
     * A geodetic network of 136 high accuracy surveyed points. Densification of SIRGAS 1995; ITRF94 at epoch 1995.4.
     * Replaced POSGAR 1994 (datum code 6694) for technical, but not legal, purposes. Replaced by POSGAR 2007 (datum
     * code 1062) from May 2009.
     */
    public const EPSG_POSICIONES_GEODESICAS_ARGENTINAS_1998 = 'urn:ogc:def:datum:EPSG::6190';

    /**
     * Posiciones Geodesicas Argentinas 2007
     * Type: Geodetic
     * Extent: Argentina
     * Coordinates of the geodetic network of 211 high accuracy surveyed points (178 passive and 33 continuously
     * operating) defining the National Geodetic System (Sistema Geodésico Nacional) based on ITRF2005 at epoch
     * 2006.632.
     * Adopted by order of the Director of the National Geographic Institute on 15th May 2009 as the new National
     * Geodetic Reference Frame. Replaces POSGAR 94.
     */
    public const EPSG_POSICIONES_GEODESICAS_ARGENTINAS_2007 = 'urn:ogc:def:datum:EPSG::1062';

    /**
     * Potsdam Datum/83
     * Type: Geodetic
     * Extent: Germany - Thuringen
     * Fundamental point: Rauenberg. Latitude: 52°27'12.021"N, longitude: 13°22'04.928"E (of Greenwich). This station
     * was destroyed in 1910 and the station at Potsdam substituted as the fundamental point.
     * PD/83 is the realization of DHDN in Thuringen. It is the resultant of applying a transformation derived at 13
     * points on the border between East and West Germany to Pulkovo 1942/83 points in Thuringen.
     */
    public const EPSG_POTSDAM_DATUM_83 = 'urn:ogc:def:datum:EPSG::6746';

    /**
     * Principe
     * Type: Geodetic
     * Extent: Sao Tome and Principe - onshore - Principe
     * Fundamental point: Morro do Papagaio. Latitude: 1°36'46.87"N, longitude: 7°23'39.65"E (of Greenwich).
     */
    public const EPSG_PRINCIPE = 'urn:ogc:def:datum:EPSG::1046';

    /**
     * Provisional South American Datum 1956
     * Type: Geodetic
     * Extent: Aruba - onshore; Bolivia; Bonaire - onshore; Brazil - offshore - Amazon Cone shelf; Chile - onshore
     * north of 43°30'S; Curacao - onshore; Ecuador - mainland onshore; Guyana - onshore; Peru - onshore; Venezuela -
     * onshore
     * Fundamental point: La Canoa. Latitude: 8°34'17.170"N, longitude: 63°51'34.880"W (of Greenwich).
     * Same origin as La Canoa datum.
     */
    public const EPSG_PROVISIONAL_SOUTH_AMERICAN_DATUM_1956 = 'urn:ogc:def:datum:EPSG::6248';

    /**
     * Puerto Rico
     * Type: Geodetic
     * Extent: Puerto Rico, US Virgin Islands and British Virgin Islands - onshore
     * Fundamental point: Cardona Island Lighthouse. Latitude:17°57'31.40"N, longitude: 66°38'07.53"W (of Greenwich).
     * NADCON conversion program provides transformation from Puerto Rico Datum to NAD83 (original 1986 realization)
     * but making the transformation appear to user as if from NAD27.
     */
    public const EPSG_PUERTO_RICO = 'urn:ogc:def:datum:EPSG::6139';

    /**
     * Puerto Rico Vertical Datum of 2002
     * Type: Vertical
     * Extent: Puerto Rico - onshore
     * Mean sea level at San Juan. Benchmark 9756371 A TIDAL = 1.334m relative to National Tidal Datum Epoch 1960-1978.
     * Replaces all earlier vertical datums for Puerto Rico.
     */
    public const EPSG_PUERTO_RICO_VERTICAL_DATUM_OF_2002 = 'urn:ogc:def:datum:EPSG::1123';

    /**
     * Pulkovo 1942
     * Type: Geodetic
     * Extent: Armenia; Azerbaijan; Belarus; Estonia - onshore; Georgia - onshore; Kazakhstan; Kyrgyzstan; Latvia -
     * onshore; Lithuania - onshore; Moldova; Russia - onshore; Tajikistan; Turkmenistan; Ukraine - onshore; Uzbekistan
     * Fundamental point: Pulkovo observatory. Latitude: 59°46'18.550"N, longitude: 30°19'42.090"E (of Greenwich).
     */
    public const EPSG_PULKOVO_1942 = 'urn:ogc:def:datum:EPSG::6284';

    /**
     * Pulkovo 1942(58)
     * Type: Geodetic
     * Extent: Onshore: Bulgaria, Czechia, Germany (former DDR), Hungary, Poland and Slovakia. Onshore and offshore:
     * Albania and Romania
     * Fundamental point: Pulkovo observatory. Latitude: 59°46'18.550"N, longitude: 30°19'42.090"E (of Greenwich).
     * 1956 international adjustment of Uniform Astro-Geodetic Network of countries of central and eastern Europe.
     * Locally densified during 1957 and 1958.
     */
    public const EPSG_PULKOVO_1942_58 = 'urn:ogc:def:datum:EPSG::6179';

    /**
     * Pulkovo 1942(83)
     * Type: Geodetic
     * Extent: Onshore Bulgaria, Czechia, Germany (former DDR), Hungary and Slovakia
     * Fundamental point: Pulkovo observatory. Latitude: 59°46'18.550"N, longitude: 30°19'42.090"E (of Greenwich).
     * 1983 international adjustment of Uniform Astro-Geodetic Network of countries of central and eastern Europe.
     */
    public const EPSG_PULKOVO_1942_83 = 'urn:ogc:def:datum:EPSG::6178';

    /**
     * Pulkovo 1995
     * Type: Geodetic
     * Extent: Russia
     * Fundamental point: Pulkovo observatory. Latitude: 59°46'15.359"N, longitude: 30°19'28.318"E (of Greenwich).
     */
    public const EPSG_PULKOVO_1995 = 'urn:ogc:def:datum:EPSG::6200';

    /**
     * Qatar 1948
     * Type: Geodetic
     * Extent: Qatar - onshore
     * Fundamental point: Sokey 0 M. Latitude: 25°22'56.500"N, longitude: 50°45'41.000"E (of Greenwich).
     */
    public const EPSG_QATAR_1948 = 'urn:ogc:def:datum:EPSG::6286';

    /**
     * Qatar 1974
     * Type: Geodetic
     * Extent: Qatar
     * Fundamental point: Station G3.
     */
    public const EPSG_QATAR_1974 = 'urn:ogc:def:datum:EPSG::6285';

    /**
     * Qatar National Datum 1995
     * Type: Geodetic
     * Extent: Qatar - onshore
     * Defined by transformation from WGS 84 - see coordinate operation code 1840.
     */
    public const EPSG_QATAR_NATIONAL_DATUM_1995 = 'urn:ogc:def:datum:EPSG::6614';

    /**
     * Qornoq 1927
     * Type: Geodetic
     * Extent: Greenland - west coast onshore
     * Fundamental point: Station 7008. Latitude: 64°31'06.27"N, longitude: 51°12'24.86"W (of Greenwich).
     */
    public const EPSG_QORNOQ_1927 = 'urn:ogc:def:datum:EPSG::6194';

    /**
     * RBEPP12 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Reading via Newbury to Penzance
     * Defined through the application of the RBEPP12 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS RBEPP12-IRF in the emulation of the RBEPP12 Snake map projection.
     */
    public const EPSG_RBEPP12_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1352';

    /**
     * Raiatea SAU 2001
     * Type: Vertical
     * Extent: French Polynesia - Society Islands - Raiatea
     * Fundamental benchmark: RN1
     * Included as part of NGPF - see datum code 5195.
     */
    public const EPSG_RAIATEA_SAU_2001 = 'urn:ogc:def:datum:EPSG::5198';

    /**
     * Ras Ghumays
     * Type: Vertical
     * Extent: UAE - Abu Dhabi onshore
     * Mean Sea Level at Ras Ghumays 1978 and 1979.
     * Orthometric heights.
     */
    public const EPSG_RAS_GHUMAYS = 'urn:ogc:def:datum:EPSG::1146';

    /**
     * Rassadiran
     * Type: Geodetic
     * Extent: Iran - Taheri refinery site
     * Fundamental point: Total1. Latitude: 27°31'07.784"N, longitude: 52°36'12.741"E (of Greenwich).
     */
    public const EPSG_RASSADIRAN = 'urn:ogc:def:datum:EPSG::6153';

    /**
     * Rauenberg Datum/83
     * Type: Geodetic
     * Extent: Germany - Sachsen
     * Fundamental point: Rauenberg. Latitude: 52°27'12.021"N, longitude: 13°22'04.928"E (of Greenwich). This station
     * was destroyed in 1910 and the station at Potsdam substituted as the fundamental point.
     * RD/83 is the realization of DHDN in Saxony. It is the resultant of applying a transformation derived at 106
     * points throughout former East Germany to Pulkovo 1942/83 points in Saxony.
     */
    public const EPSG_RAUENBERG_DATUM_83 = 'urn:ogc:def:datum:EPSG::6745';

    /**
     * Red Geodesica Para Mineria en Chile
     * Type: Dynamic geodetic
     * Extent: Chile. Includes Easter Island, Juan Fernandez Islands, San Felix, and Sala y Gomez
     * Realized through 26 stations in the IGS (SIRGAS-CON) active reference station network in Chile.
     */
    public const EPSG_RED_GEODESICA_PARA_MINERIA_EN_CHILE = 'urn:ogc:def:datum:EPSG::1304';

    /**
     * Red Geodesica Venezolana
     * Type: Geodetic
     * Extent: Venezuela
     * Realised by a frame of 67 stations observed in 1995 as a densification of the SIRGAS campaign and adjusted in
     * the ITRF94 at epoch 1995.4.
     */
    public const EPSG_RED_GEODESICA_VENEZOLANA = 'urn:ogc:def:datum:EPSG::6189';

    /**
     * Red Geodesica de Canarias 1995
     * Type: Geodetic
     * Extent: Spain - Canary Islands
     * ITRF93 at epoch 1994.9 at VLBI station INTA at the Canary Spatial Centre (CEC) at Maspalomas on Grand Canary.
     * Replaces Pico de las Nieves 1968 (PN68) and Pico de las Nieves 1984 (PN84).
     */
    public const EPSG_RED_GEODESICA_DE_CANARIAS_1995 = 'urn:ogc:def:datum:EPSG::1035';

    /**
     * Reference System de Angola 2013
     * Type: Geodetic
     * Extent: Angola
     * Network of 18 stations throughout Angola referenced to ITRF2008 @ 2010.90.
     * Established through daily PPP solutions in GPS week G1610.
     */
    public const EPSG_REFERENCE_SYSTEM_DE_ANGOLA_2013 = 'urn:ogc:def:datum:EPSG::1220';

    /**
     * Reseau Geodesique Francais 1993 v1
     * Type: Geodetic
     * Extent: France, mainland and Corsica (France métropolitaine including Corsica)
     * Coincident with ETRS89 at epoch 1993.0. Derived from long-term GNSS observations at 23 points aligned to ETRF93.
     * @ 1993.0 through fundamental points at Grasse, Toulouse and Brest. Network supplemented in 1994 and 1995 by
     * approx. 1000 additional stations.
     * RGF93 v1 is a realization of ETRS89. Replaced by RGF93 v2 (datum code 1312) from 2010-06-18.
     */
    public const EPSG_RESEAU_GEODESIQUE_FRANCAIS_1993_V1 = 'urn:ogc:def:datum:EPSG::6171';

    /**
     * Reseau Geodesique Francais 1993 v2
     * Type: Geodetic
     * Extent: France, mainland and Corsica (France métropolitaine including Corsica)
     * Aligned with ETRF2000 at epoch 2009.0. Based on the French GNSS permanent network (RGP) from 1998 to 2009, and
     * the re-observation of the geodetic points of the French Reference Network (RRF) and French Base Network
     * (RBF) from 2000 to 2011.
     * RGF93 v2 is a realization of ETRS89. Replaces RGF93 v1 (datum code 6171) from 2010-06-18. Replaced by RGF93 v2b
     * (datum code 1313) from 2021-01-05.
     */
    public const EPSG_RESEAU_GEODESIQUE_FRANCAIS_1993_V2 = 'urn:ogc:def:datum:EPSG::1312';

    /**
     * Reseau Geodesique Francais 1993 v2b
     * Type: Geodetic
     * Extent: France, mainland and Corsica (France métropolitaine including Corsica)
     * Aligned with ETRF2000 at epoch 2019.0. Derived through reprocessing of the French GNSS permanent network (RGP)
     * in IGS14.
     * RGF93 v2b is a realization of ETRS89. Third realization of RGF93. Replaces RGF93 v2 (datum code 1312) from
     * 2021-01-05.
     */
    public const EPSG_RESEAU_GEODESIQUE_FRANCAIS_1993_V2B = 'urn:ogc:def:datum:EPSG::1313';

    /**
     * Reseau Geodesique Francais Guyane 1995
     * Type: Geodetic
     * Extent: French Guiana
     * ITRF93 at epoch 1995.0
     * Replaces CSG67 (datum code 6623).
     */
    public const EPSG_RESEAU_GEODESIQUE_FRANCAIS_GUYANE_1995 = 'urn:ogc:def:datum:EPSG::6624';

    /**
     * Reseau Geodesique de Mayotte 2004
     * Type: Geodetic
     * Extent: Mayotte
     * ITRF2000 at epoch 2004.0
     * Replaces Combani 1950 (datum code 6632) except for cadastral purposes. (Cadastre 1997 (datum code 1037) used for
     * cadastral purposes).
     */
    public const EPSG_RESEAU_GEODESIQUE_DE_MAYOTTE_2004 = 'urn:ogc:def:datum:EPSG::1036';

    /**
     * Reseau Geodesique de Nouvelle Caledonie 2015
     * Type: Geodetic
     * Extent: New Caledonia. Isle de Pins, Loyalty Islands, Huon Islands, Belep archipelago, Chesterfield Islands, and
     * Walpole
     * Aligned with ITRF2008 at epoch 2015.0.
     * Replaces RGNC91-93.
     */
    public const EPSG_RESEAU_GEODESIQUE_DE_NOUVELLE_CALEDONIE_2015 = 'urn:ogc:def:datum:EPSG::1357';

    /**
     * Reseau Geodesique de Nouvelle Caledonie 91-93
     * Type: Geodetic
     * Extent: New Caledonia. Isle de Pins, Loyalty Islands, Huon Islands, Belep archipelago, Chesterfield Islands, and
     * Walpole
     * ITRF90 at epoch 1989.0.
     * Replaced by RGNC15 (datum code 1357).
     */
    public const EPSG_RESEAU_GEODESIQUE_DE_NOUVELLE_CALEDONIE_91_93 = 'urn:ogc:def:datum:EPSG::6749';

    /**
     * Reseau Geodesique de Saint Pierre et Miquelon 2006
     * Type: Geodetic
     * Extent: St Pierre and Miquelon
     * ITRF2000 at epoch 2006.0
     * Replaces Saint Pierre et Miquelon 1950 (datum code 6638).
     */
    public const EPSG_RESEAU_GEODESIQUE_DE_SAINT_PIERRE_ET_MIQUELON_2006 = 'urn:ogc:def:datum:EPSG::1038';

    /**
     * Reseau Geodesique de Wallis et Futuna 1996
     * Type: Geodetic
     * Extent: Wallis and Futuna - Uvea, Futuna, and Alofi
     * Coincident with ITRF94 at epoch 1993.00.
     */
    public const EPSG_RESEAU_GEODESIQUE_DE_WALLIS_ET_FUTUNA_1996 = 'urn:ogc:def:datum:EPSG::1223';

    /**
     * Reseau Geodesique de la Polynesie Francaise
     * Type: Geodetic
     * Extent: French Polynesia. Includes Society archipelago, Tuamotu archipelago, Marquesas Islands, Gambier Islands
     * and Austral Islands
     * ITRF92 at epoch 1993.0. Densification by GPS of the Reference Network of French Polynesia, a coordinate set of
     * 13 stations determined through DORIS observations.
     * Replaces Tahaa 54 (datum code 6629), IGN 63 Hiva Oa (6689), IGN 72 Nuku Hiva (6630), Maupiti 83 (6692), MHEFO 55
     * (6688), Moorea 87 (6691) and Tahiti 79 (6690).
     */
    public const EPSG_RESEAU_GEODESIQUE_DE_LA_POLYNESIE_FRANCAISE = 'urn:ogc:def:datum:EPSG::6687';

    /**
     * Reseau Geodesique de la RDC 2005
     * Type: Geodetic
     * Extent: The Democratic Republic of the Congo (Zaire) - south of a line through Bandundu, Seke and Pweto
     * ITRF2000 at epoch 2005.4.
     */
    public const EPSG_RESEAU_GEODESIQUE_DE_LA_RDC_2005 = 'urn:ogc:def:datum:EPSG::1033';

    /**
     * Reseau Geodesique de la Reunion 1992
     * Type: Geodetic
     * Extent: Reunion
     * ITRF91 at epoch 1993.0
     * Replaces Piton des Neiges (code 6626).
     */
    public const EPSG_RESEAU_GEODESIQUE_DE_LA_REUNION_1992 = 'urn:ogc:def:datum:EPSG::6627';

    /**
     * Reseau Geodesique des Antilles Francaises 2009
     * Type: Geodetic
     * Extent: French Antilles - Guadeloupe (including Grande Terre, Basse Terre, Marie Galante, Les Saintes, Iles de
     * la Petite Terre, La Desirade); Martinique; St Barthélemy; St Martin
     * ITRF2005 at epoch 2009.0
     * Replaces RRAF91 in Martinique and Guadeloupe.
     */
    public const EPSG_RESEAU_GEODESIQUE_DES_ANTILLES_FRANCAISES_2009 = 'urn:ogc:def:datum:EPSG::1073';

    /**
     * Reseau Geodesique des Terres Australes et Antarctiques Francaises 2007
     * Type: Geodetic
     * Extent: French Southern Territories: Amsterdam and St Paul, Crozet, Europa and Kerguelen. Antarctica - Adelie
     * Land coastal area
     * ITRF2005 at epoch 2007.274
     * Replaces IGN 1963-64 on Amsterdam, Saint-Paul 1969 on St Paul, IGN64 on Crozet, MHM 1954 on Europa, IGN 1962 on
     * Kerguelen, and Petrels 1972 and Perroud 1950 in Adelie Land.
     */
    public const EPSG_RESEAU_GEODESIQUE_DES_TERRES_AUSTRALES_ET_ANTARCTIQUES_FRANCAISES_2007 = 'urn:ogc:def:datum:EPSG::1113';

    /**
     * Reseau National Belge 1950
     * Type: Geodetic
     * Extent: Belgium - onshore
     * Fundamental point: Lommel (tower). Latitude: 51°13'47.334"N, longitude: 5°18'49.483"E (of Greenwich).
     */
    public const EPSG_RESEAU_NATIONAL_BELGE_1950 = 'urn:ogc:def:datum:EPSG::6215';

    /**
     * Reseau National Belge 1950 (Brussels)
     * Type: Geodetic
     * Extent: Belgium - onshore
     * Fundamental point: Lommel (tower). Latitude: 51°13'47.334"N, longitude: 0°56'44.773"E (of Brussels).
     */
    public const EPSG_RESEAU_NATIONAL_BELGE_1950_BRUSSELS = 'urn:ogc:def:datum:EPSG::6809';

    /**
     * Reseau National Belge 1972
     * Type: Geodetic
     * Extent: Belgium - onshore
     * Fundamental point: Uccle observatory. Latitude: 50°47'57.704"N, longitude: 4°21'24.983"E (of Greenwich).
     */
    public const EPSG_RESEAU_NATIONAL_BELGE_1972 = 'urn:ogc:def:datum:EPSG::6313';

    /**
     * Reseau de Reference des Antilles Francaises 1991
     * Type: Geodetic
     * Extent: French Antilles - Guadeloupe (including Grande Terre, Basse Terre, Marie Galante, Les Saintes, Iles de
     * la Petite Terre, La Desirade); Martinique; St Barthélemy; St Martin
     * WGS 84 coordinates of a single station determined during the 1988 Tango mission.
     * Replaces Fort Marigot and Sainte Anne (datum codes 6621-22) in Guadeloupe and Fort Desaix (datum code 6625) in
     * Martinique. Replaced by Reseau Geodesique des Antilles Francaises 2009 (datum code 1073).
     */
    public const EPSG_RESEAU_DE_REFERENCE_DES_ANTILLES_FRANCAISES_1991 = 'urn:ogc:def:datum:EPSG::1047';

    /**
     * Rete Dinamica Nazionale 2008
     * Type: Geodetic
     * Extent: Italy; San Marino, Vatican City State
     * Italian densification of ETRS89 realised through network of 99 permanent reference stations in [email protected].
     * Adopted as official Italian reference datum 10/11/2011. Replaces IGM95 (datum code 6670).
     */
    public const EPSG_RETE_DINAMICA_NAZIONALE_2008 = 'urn:ogc:def:datum:EPSG::1132';

    /**
     * Reunion 1947
     * Type: Geodetic
     * Extent: Reunion - onshore
     * Fundamental point: Piton des Neiges (Borne). Latitude: 21°05'13.119"S, longitude: 55°29'09.193"E (of
     * Greenwich).
     * Replaced by RGR92 (datum code 6627).
     */
    public const EPSG_REUNION_1947 = 'urn:ogc:def:datum:EPSG::6626';

    /**
     * Reunion 1989
     * Type: Vertical
     * Extent: Reunion - onshore
     * Mean sea level during part of November 1949 at port of Saint-Pierre. Origin = marker AB-100 with defined
     * elevation of 13.808m above msl.
     * Orthometric heights. Replaces Reunion IGN58. Value of marker AB-100 retains height from 1958 adjustment.
     */
    public const EPSG_REUNION_1989 = 'urn:ogc:def:datum:EPSG::5156';

    /**
     * Reykjavik 1900
     * Type: Geodetic
     * Extent: Iceland - mainland
     * Fundamental point:  Latitude: 64°08'31.88"N, longitude: 21°55'51.15"W (of Greenwich).
     */
    public const EPSG_REYKJAVIK_1900 = 'urn:ogc:def:datum:EPSG::6657';

    /**
     * Rikets hojdsystem 1900
     * Type: Vertical
     * Extent: Sweden - onshore
     * Adjustment is referenced to mean sea level at Slussen, Stockholm.
     * Realized through the first precise levelling network of 1886-1905. Replaced by RH70.
     */
    public const EPSG_RIKETS_HOJDSYSTEM_1900 = 'urn:ogc:def:datum:EPSG::5209';

    /**
     * Rikets hojdsystem 1970
     * Type: Vertical
     * Extent: Sweden - onshore
     * Adjustment is referenced to mean high tide at Amsterdams Peil in 1684. To account for land level movements
     * caused by isostatic rebound, heights are reduced to epoch 1970.0 using uplift values computed from repeated
     * levelling observations.
     * Realized through the second precise levelling network of 1951-1967. Uses Normal heights. Replaces RH00. Replaced
     * in 2005 by RH2000.
     */
    public const EPSG_RIKETS_HOJDSYSTEM_1970 = 'urn:ogc:def:datum:EPSG::5117';

    /**
     * Rikets hojdsystem 2000
     * Type: Vertical
     * Extent: Sweden - onshore
     * Adjustment is referenced to mean high tide at Amsterdams Peil in 1684. To account for land level movements
     * caused by isostatic rebound, heights are reduced to epoch 2000.0 using values computed from the RH 2000 LU
     * (=NKG2005LU) uplift model.
     * Realized through the third precise levelling network of 1979-2003. Adopted in 2005, replacing RH70. Uses Normal
     * heights.
     */
    public const EPSG_RIKETS_HOJDSYSTEM_2000 = 'urn:ogc:def:datum:EPSG::5208';

    /**
     * Rikets koordinatsystem 1990
     * Type: Geodetic
     * Extent: Sweden
     * Replaces RT38 adjustment (datum code 6308).
     */
    public const EPSG_RIKETS_KOORDINATSYSTEM_1990 = 'urn:ogc:def:datum:EPSG::6124';

    /**
     * Ross Sea Region Geodetic Datum 2000
     * Type: Geodetic
     * Extent: Antarctica - Ross Sea Region - nominally between 160°E and 150°W but includes buffer on eastern
     * hemisphere margin to include Transantarctic Mountains
     * Based on ITRF96 at epoch 2000.0.
     */
    public const EPSG_ROSS_SEA_REGION_GEODETIC_DATUM_2000 = 'urn:ogc:def:datum:EPSG::6764';

    /**
     * SCM22 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the Scottish central mainline rail route from Motherwell through Perth and
     * Pitlochry to Inverness
     * Defined through the application of the SCM22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
     * Created in 2022 to support intermediate CRS "SCM22-IRF" in the emulation of the SCM22 Snake map projection.
     */
    public const EPSG_SCM22_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1320';

    /**
     * SIRGAS Continuously Operating Network DGF00P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to ITRF97 at epoch 2000.40. Realized by a frame of 31 continuously operating stations using GPS
     * observations from June 1996 to February 2000. Velocity model VEMOS2003 used to propagate coordinates to the
     * frame reference epoch.
     * DGF00P01 is included in ITRF2000 as a regional densification for South America. Replaced by DGF01P01 (datum code
     * 1228).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_DGF00P01 = 'urn:ogc:def:datum:EPSG::1227';

    /**
     * SIRGAS Continuously Operating Network DGF01P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to ITRF2000 at epoch 2000.00. Realized by a frame of 48 continuously operating stations using GPS
     * observations from June 1996 to April 2001. Velocity model VEMOS2003 used to propagate coordinates to the frame
     * reference epoch.
     * Replaces DGF00P01 (datum code 1227). Replaced by DGF01P02 (datum code 1229).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_DGF01P01 = 'urn:ogc:def:datum:EPSG::1228';

    /**
     * SIRGAS Continuously Operating Network DGF01P02
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to ITRF2000 at epoch 1998.40. Realized by a frame of 49 continuously operating stations using GPS
     * observations from June 1996 to October 2001. Velocity model VEMOS2003 used to propagate coordinates to the frame
     * reference epoch.
     * Replaces DGF01P01 (datum code 1228). Replaced by DGF02P01 (datum code 1230).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_DGF01P02 = 'urn:ogc:def:datum:EPSG::1229';

    /**
     * SIRGAS Continuously Operating Network DGF02P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to ITRF2000 at epoch 2000.00. Realized by a frame of 53 continuously operating stations using GPS
     * observations from June 1996 to July 2002. Velocity model VEMOS2003 used to propagate coordinates to the frame
     * reference epoch.
     * Replaces DGF01P02 (datum code 1229). Replaced by DGF04P01 (datum code 1331).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_DGF02P01 = 'urn:ogc:def:datum:EPSG::1230';

    /**
     * SIRGAS Continuously Operating Network DGF04P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to ITRF2000 at epoch 2003.00. Realized by a frame of 69 continuously operating stations using GPS
     * observations from June 1996 to July 2004. Velocity model VEMOS2003 used to propagate coordinates to the frame
     * reference epoch.
     * Replaces DGF02P01 (datum code 1230). Replaced by DGF05P01 (datum code 1232).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_DGF04P01 = 'urn:ogc:def:datum:EPSG::1231';

    /**
     * SIRGAS Continuously Operating Network DGF05P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to ITRF2000 at epoch 2004.00. Realized by a frame of 95 continuously operating stations using GPS
     * observations from June 1996 to September 2005. Velocity model VEMOS2003 used to propagate coordinates to the
     * frame reference epoch.
     * Replaces DGF04P01 (datum code 1231). Replaced by DGF06P01 (datum code 1233).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_DGF05P01 = 'urn:ogc:def:datum:EPSG::1232';

    /**
     * SIRGAS Continuously Operating Network DGF06P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to ITRF2000 at epoch 2004.00. Realized by a frame of 94 continuously operating stations using GPS
     * observations from June 1996 to June 2006. Velocity model VEMOS2003 used to propagate coordinates to the frame
     * reference epoch.
     * Replaces DGF05P01 (datum code 1232). Replaced by DGF07P01 (datum code 1234).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_DGF06P01 = 'urn:ogc:def:datum:EPSG::1233';

    /**
     * SIRGAS Continuously Operating Network DGF07P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to IGS05 at epoch 2004.50. Realized by a frame of 106 continuously operating stations using GPS
     * observations in 3 periods between December 2001 and October 2007. Velocity model VEMOS2003 used to propagate
     * coordinates to the frame reference epoch.
     * Replaces DGF06P01 (datum code 1233). Replaced by DGF08P01 (datum code 1235).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_DGF07P01 = 'urn:ogc:def:datum:EPSG::1234';

    /**
     * SIRGAS Continuously Operating Network DGF08P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to IGS05 at epoch 2004.50. Realized by a frame of 126 continuously operating stations using GPS
     * observations from December 2002 to March 2008. Velocity model VEMOS2003 used to propagate coordinates to the
     * frame reference epoch.
     * Replaces DGF07P01 (datum code 1234). Replaced by SIR09P01 (datum code 1236).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_DGF08P01 = 'urn:ogc:def:datum:EPSG::1235';

    /**
     * SIRGAS Continuously Operating Network SIR09P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to IGS05 at epoch 2005.00. Realized by a frame of 128 continuously operating stations using GPS
     * observations from January 2000 to January 2009. Velocity model VEMOS2009 used to propagate coordinates to the
     * frame reference epoch.
     * Replaces DGF08P01 (datum code 1235). Replaced by SIR10P01 (datum code 1237).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_SIR09P01 = 'urn:ogc:def:datum:EPSG::1236';

    /**
     * SIRGAS Continuously Operating Network SIR10P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to ITRF08 at epoch 2005.00. Realized by a frame of 183 continuously operating stations using GPS
     * observations from January 2000 to June 2010. Velocity model VEMOS2009 used to propagate coordinates to the frame
     * reference epoch.
     * Replaces SIR09P01 (datum code 1236). Replaced by SIR11P01 (datum code 1238).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_SIR10P01 = 'urn:ogc:def:datum:EPSG::1237';

    /**
     * SIRGAS Continuously Operating Network SIR11P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to ITRF08 at epoch 2005.00. Realized by a frame of 230 continuously operating stations using GPS
     * observations from January 2000 to April 2011. Velocity model VEMOS2009 used to propagate coordinates to the
     * frame reference epoch.
     * Replaces SIR10P01 (datum code 1237). Replaced by SIR13P01 (datum code 1239). Last multi-year solution without
     * the effects of the El Maule earthquake in February 2010.
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_SIR11P01 = 'urn:ogc:def:datum:EPSG::1238';

    /**
     * SIRGAS Continuously Operating Network SIR13P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to IGb08 at epoch 2012.00. Realized by a frame of 108 continuously operating stations using GPS
     * observations from April 2010 to June 2013. Velocity model VEMOS2009 used to propagate coordinates to the frame
     * reference epoch.
     * Replaces SIR11P01 (datum code 1238). Replaced by SIR14P01 (datum code 1240). First multi-year solution after the
     * El Maule earthquake of February 2010.
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_SIR13P01 = 'urn:ogc:def:datum:EPSG::1239';

    /**
     * SIRGAS Continuously Operating Network SIR14P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to IGb08 at epoch 2013.00. Realized by a frame of 242 continuously operating stations using GNSS
     * observations from April 2010 to July 2014. Velocity model VEMOS2009 used to propagate coordinates to the frame
     * reference epoch.
     * Replaces SIR13P01 (datum code 1239). Replaced by SIR15P01 (datum code 1241).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_SIR14P01 = 'urn:ogc:def:datum:EPSG::1240';

    /**
     * SIRGAS Continuously Operating Network SIR15P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to IGb08 at epoch 2013.00. Realized by a frame of 303 continuously operating stations using GNSS
     * observations from March 2010 to April 2015. Velocity model VEMOS2015 used to propagate coordinates to the frame
     * reference epoch.
     * Replaces SIR14P01 (datum code 1240). Replaced by SIR17P01 (datum code 1242).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_SIR15P01 = 'urn:ogc:def:datum:EPSG::1241';

    /**
     * SIRGAS Continuously Operating Network SIR17P01
     * Type: Dynamic geodetic
     * Extent: Latin America - Central America and South America
     * Aligned to IGS14 at epoch 2015.00. Realized by a frame of 345 continuously operating stations using GNSS
     * observations from April 2011 to January 2017. Velocity model VEMOS2017 used to propagate coordinates to the
     * frame reference epoch.
     * Replaces SIR15P01 (datum code 1241).
     */
    public const EPSG_SIRGAS_CONTINUOUSLY_OPERATING_NETWORK_SIR17P01 = 'urn:ogc:def:datum:EPSG::1242';

    /**
     * SIRGAS-Chile realization 1 epoch 2002
     * Type: Geodetic
     * Extent: Chile. Includes Easter Island, Juan Fernandez Islands, San Felix, and Sala y Gomez
     * ITRF2000 at epoch 2002.0.  Densification of SIRGAS 2000 network in Chile, consisting of 650 monumented stations.
     * Densification of SIRGAS 2000 within Chile. Replaces PSAD56 (datum code 6248) in Chile, HITO XVIII (datum code
     * 6254) in Chilean Tierra del Fuego and Easter Island 1967 (datum code 6719) in Easter Island. Replaced by
     * SIRGAS-Chile 2010 (datum code 1243).
     */
    public const EPSG_SIRGAS_CHILE_REALIZATION_1_EPOCH_2002 = 'urn:ogc:def:datum:EPSG::1064';

    /**
     * SIRGAS-Chile realization 2 epoch 2010
     * Type: Geodetic
     * Extent: Chile. Includes Easter Island, Juan Fernandez Islands, San Felix, and Sala y Gomez
     * IGS08 at epoch 2010.00. Densification of SIRGAS-CON network in Chile, consisting of 120 monumented stations.
     * Replaces SIRGAS-Chile realization 1 epoch 2002, following significant tectonic deformation. Replaced by
     * SIRGAS-Chile realization 3 epoch 2013.
     */
    public const EPSG_SIRGAS_CHILE_REALIZATION_2_EPOCH_2010 = 'urn:ogc:def:datum:EPSG::1243';

    /**
     * SIRGAS-Chile realization 3 epoch 2013
     * Type: Geodetic
     * Extent: Chile. Includes Easter Island, Juan Fernandez Islands, San Felix, and Sala y Gomez
     * IGb08 at epoch 2013.00. Densification of SIRGAS-CON network in Chile, consisting of 130 monumented stations.
     * Replaces SIRGAS-Chile realization 2 epoch 2010, following significant tectonic deformation. Replaced by
     * SIRGAS-Chile realization 4 epoch 2016.
     */
    public const EPSG_SIRGAS_CHILE_REALIZATION_3_EPOCH_2013 = 'urn:ogc:def:datum:EPSG::1252';

    /**
     * SIRGAS-Chile realization 4 epoch 2016
     * Type: Geodetic
     * Extent: Chile. Includes Easter Island, Juan Fernandez Islands, San Felix, and Sala y Gomez
     * IGb08 at epoch 2016.00. Densification of SIRGAS-CON network in Chile, consisting of 200 monumented stations.
     * Replaces SIRGAS-Chile realization 3 epoch 2013. Replaced by SIRGAS-Chile realization 5 epoch 2021 due to
     * significant tectonic deformation.
     */
    public const EPSG_SIRGAS_CHILE_REALIZATION_4_EPOCH_2016 = 'urn:ogc:def:datum:EPSG::1253';

    /**
     * SIRGAS-Chile realization 5 epoch 2021
     * Type: Geodetic
     * Extent: Chile. Includes Easter Island, Juan Fernandez Islands, San Felix, and Sala y Gomez
     * Densification of SIRGAS-CON network in Chile, consisting of 97 stations forming the active CORS network (RGN)
     * referenced to IGb2014 (ITRF2014) at epoch 2021.00. Passive stations used in previous realizations have been
     * removed from this solution.
     * Replaces SIRGAS-Chile realization 4 epoch 2016 from August 2021 due to significant tectonic deformation. 24
     * additional active CORS used in this realization compared to that of 2016.
     */
    public const EPSG_SIRGAS_CHILE_REALIZATION_5_EPOCH_2021 = 'urn:ogc:def:datum:EPSG::1327';

    /**
     * SIRGAS-ROU98
     * Type: Geodetic
     * Extent: Uruguay
     * Densification of SIRGAS95 network in Uruguay, consisting of 17 passive geodetic stations and 3 continuous
     * recording GPS stations. ITRF94 at epoch 1995.4.
     * Densification of SIRGAS 1995 within Uruguay. Replaces Yacare (datum code 6309) in Uruguay. Uruguay documentation
     * clearly states use of WGS 84 reference ellipsoid.
     */
    public const EPSG_SIRGAS_ROU98 = 'urn:ogc:def:datum:EPSG::1068';

    /**
     * SIRGAS_ES2007.8
     * Type: Geodetic
     * Extent: El Salvador
     * ITRF2005 at epoch 2007.85.  Densification of SIRGAS-CON network in El Salvador, consisting of 38 monumented
     * stations.
     * SIRGAS-ES2007.8 is the national SIRGAS densification.
     */
    public const EPSG_SIRGAS_ES2007_8 = 'urn:ogc:def:datum:EPSG::1069';

    /**
     * SMITB20 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Okehampton to Penstone
     * Defined through the application of the SMITB20 NTv2 transformation to ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2022 to support intermediate CRS SMITB20-IRF in the emulation of the SMITB20 Snake map projection.
     */
    public const EPSG_SMITB20_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1351';

    /**
     * ST71 Belep
     * Type: Geodetic
     * Extent: New Caledonia - Belep.
     */
    public const EPSG_ST71_BELEP = 'urn:ogc:def:datum:EPSG::6643';

    /**
     * ST84 Ile des Pins
     * Type: Geodetic
     * Extent: New Caledonia - Ile des Pins
     * Fundamental point: Pic Nga.
     */
    public const EPSG_ST84_ILE_DES_PINS = 'urn:ogc:def:datum:EPSG::6642';

    /**
     * ST87 Ouvea
     * Type: Geodetic
     * Extent: New Caledonia - Loyalty Islands - Ouvea
     * Ouloup.
     */
    public const EPSG_ST87_OUVEA = 'urn:ogc:def:datum:EPSG::6750';

    /**
     * SVY21
     * Type: Geodetic
     * Extent: Singapore
     * Fundamental point: Base 7 at Pierce Reservoir. Latitude: 1°22'02.9154"N, longitude: 103°49'31.9752"E (of
     * Greenwich).
     * Replaces Kertau 1968 for cadastral purposes from August 2004.
     */
    public const EPSG_SVY21 = 'urn:ogc:def:datum:EPSG::6757';

    /**
     * SWEREF99
     * Type: Geodetic
     * Extent: Sweden
     * Densification of ETRS89.
     * The solution was calculated in ITRF97 epoch 1999.5, and has subsequently been corrected to ETRS89 in accordance
     * with guidelines given by EUREF.
     */
    public const EPSG_SWEREF99 = 'urn:ogc:def:datum:EPSG::6619';

    /**
     * SYC20 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Shrewsbury to Crewe
     * Defined through the application of the SYC20 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
     * Created in 2022 to support intermediate CRS SYC20-IRF in the emulation of the SYC20 Snake map projection.
     */
    public const EPSG_SYC20_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1345';

    /**
     * Saint Pierre et Miquelon 1950
     * Type: Geodetic
     * Extent: St Pierre and Miquelon - onshore
     * Replaced by RGSPM06 (datum code 1038).
     */
    public const EPSG_SAINT_PIERRE_ET_MIQUELON_1950 = 'urn:ogc:def:datum:EPSG::6638';

    /**
     * Santa Cruz da Graciosa
     * Type: Vertical
     * Extent: Portugal - central Azores - Graciosa island onshore
     * Mean Sea Level during 1938 at Santa Cruz da Graciosa.
     * Orthometric heights.
     */
    public const EPSG_SANTA_CRUZ_DA_GRACIOSA = 'urn:ogc:def:datum:EPSG::1106';

    /**
     * Santa Cruz das Flores
     * Type: Vertical
     * Extent: Portugal - western Azores onshore - Flores, Corvo
     * Mean Sea Level during 1965 at Santa Cruz das Flores.
     * Orthometric heights.
     */
    public const EPSG_SANTA_CRUZ_DAS_FLORES = 'urn:ogc:def:datum:EPSG::1108';

    /**
     * Santo 1965
     * Type: Geodetic
     * Extent: Vanuatu - northern islands - Aese, Ambrym, Aoba, Epi, Espiritu Santo, Maewo, Malo, Malkula, Paama,
     * Pentecost, Shepherd and Tutuba
     * Datum covers all the major islands of Vanuatu in two different adjustment blocks, but practical usage is as
     * given in the area of use.
     */
    public const EPSG_SANTO_1965 = 'urn:ogc:def:datum:EPSG::6730';

    /**
     * Sao Tome
     * Type: Geodetic
     * Extent: Sao Tome and Principe - onshore - Sao Tome
     * Fundamental point: Fortaleza. Latitude: 0°20'49.02"N, longitude: 6°44'41.85"E (of Greenwich).
     */
    public const EPSG_SAO_TOME = 'urn:ogc:def:datum:EPSG::1044';

    /**
     * Sapper Hill 1943
     * Type: Geodetic
     * Extent: Falkland Islands (Malvinas) - onshore.
     */
    public const EPSG_SAPPER_HILL_1943 = 'urn:ogc:def:datum:EPSG::6292';

    /**
     * Schwarzeck
     * Type: Geodetic
     * Extent: Namibia
     * Fundamental point: Schwarzeck. Latitude: 22°45'35.820"S, longitude: 18°40'34.549"E (of Greenwich). Fixed
     * during German South West Africa-British Bechuanaland boundary survey of 1898-1903.
     */
    public const EPSG_SCHWARZECK = 'urn:ogc:def:datum:EPSG::6293';

    /**
     * Scoresbysund 1952
     * Type: Geodetic
     * Extent: Greenland - Scoresbysund area onshore.
     */
    public const EPSG_SCORESBYSUND_1952 = 'urn:ogc:def:datum:EPSG::6195';

    /**
     * Selvagem Grande
     * Type: Geodetic
     * Extent: Portugal - Selvagens islands (Madeira province) - onshore.
     */
    public const EPSG_SELVAGEM_GRANDE = 'urn:ogc:def:datum:EPSG::6616';

    /**
     * Serbian Reference Network 1998
     * Type: Geodetic
     * Extent: Serbia including Vojvodina
     * Densification of ETRS89 in Serbia at epoch 1998.7 based on coordinates of 6 stations in Serbia of Yugoslav
     * Reference Frame (YUREF) 1998 campaign.
     * Observed 1998-2003.
     */
    public const EPSG_SERBIAN_REFERENCE_NETWORK_1998 = 'urn:ogc:def:datum:EPSG::1034';

    /**
     * Serbian Spatial Reference System 2000
     * Type: Geodetic
     * Extent: Serbia including Vojvodina
     * Densification of ETRF2000 in Serbia at epoch 2010.63.
     * Replaces SREF98.
     */
    public const EPSG_SERBIAN_SPATIAL_REFERENCE_SYSTEM_2000 = 'urn:ogc:def:datum:EPSG::1214';

    /**
     * Serbian Vertical Reference System 2012
     * Type: Vertical
     * Extent: Serbia including Vojvodina
     * Mean sea level of Adriatic Sea in 1971.
     * Normal heights above quasi-geoid. In Serbia replaces Trieste (datum code 1050).
     */
    public const EPSG_SERBIAN_VERTICAL_REFERENCE_SYSTEM_2012 = 'urn:ogc:def:datum:EPSG::1216';

    /**
     * Serindung
     * Type: Geodetic
     * Extent: Indonesia - west Kalimantan - onshore coastal area
     * Fundamental point: Ep A. Latitude: 1°06'10.60"N, longitude: 105°00'59.82"E (of Greenwich).
     */
    public const EPSG_SERINDUNG = 'urn:ogc:def:datum:EPSG::6295';

    /**
     * ShAb07 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the rail route from Shrewsbury to Aberystwyth
     * Defined through the application of the ShAb07 NTv2 transformation (code 10186) to ETRS89 as realized through
     * OSNet v2009 CORS.
     * Created in 2022 to support intermediate CRS ShAb07-IRF in the emulation of the ShAb07 Snake map projection.
     */
    public const EPSG_SHAB07_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1335';

    /**
     * Sibun Gorge 1922
     * Type: Geodetic
     * Extent: Belize - onshore
     * Latitude: 17º03'40.471"N, longitude: 88º37'54.687"W.
     */
    public const EPSG_SIBUN_GORGE_1922 = 'urn:ogc:def:datum:EPSG::1071';

    /**
     * Sierra Leone 1968
     * Type: Geodetic
     * Extent: Sierra Leone - onshore
     * Fundamental point: SLX2 Astro. Latitude: 8°27'17.567"N, longitude: 12°49'40.186"W (of Greenwich).
     * Extension and readjustment with additional observations of 1960 network. Coordinates of 1960 stations change by
     * less than 3 metres.
     */
    public const EPSG_SIERRA_LEONE_1968 = 'urn:ogc:def:datum:EPSG::6175';

    /**
     * Sierra Leone Colony 1924
     * Type: Geodetic
     * Extent: Sierra Leone - Freetown Peninsula
     * Fundamental point: Kortright. Latitude: 8°28'44.4"N, longitude: 13°13'03.81"W (of Greenwich).
     */
    public const EPSG_SIERRA_LEONE_COLONY_1924 = 'urn:ogc:def:datum:EPSG::6174';

    /**
     * Singapore Height Datum
     * Type: Vertical
     * Extent: Singapore
     * Mean sea level determined at Victoria Dock tide gauge 1935-1937.
     * Orthometric heights. Network readjusted in 2009.
     */
    public const EPSG_SINGAPORE_HEIGHT_DATUM = 'urn:ogc:def:datum:EPSG::1140';

    /**
     * Sistem Referensi Geospasial Indonesia 2013
     * Type: Dynamic geodetic
     * Extent: Indonesia
     * ITRF2008 at epoch 2012.0.
     * Semi-dynamic datum. Geometric element of geodetic control network (JKG). Replaces DGN95 and all older datums.
     */
    public const EPSG_SISTEM_REFERENSI_GEOSPASIAL_INDONESIA_2013 = 'urn:ogc:def:datum:EPSG::1293';

    /**
     * Sistema Geodesico Nacional de Panama MACARIO SOLIS
     * Type: Geodetic
     * Extent: Panama
     * ITRF2000 at epoch 2000.0. Densification of SIRGAS 2000 network in Panama, consisting of 20 GPS stations
     * throughout the country.
     */
    public const EPSG_SISTEMA_GEODESICO_NACIONAL_DE_PANAMA_MACARIO_SOLIS = 'urn:ogc:def:datum:EPSG::1066';

    /**
     * Sistema de Referencia Geocentrico para America del Sur 1995
     * Type: Geodetic
     * Extent: South America. Ecuador (mainland and Galapagos)
     * ITRF94 at epoch 1995.4.
     * Realized by a frame of 58 stations observed in 1995 and adjusted in ITRF94. Provisional NIMA adjustment
     * reference epoch was 1995.42 but final report accepted value is 1995.40. Replaced by SIRGAS 2000.
     */
    public const EPSG_SISTEMA_DE_REFERENCIA_GEOCENTRICO_PARA_AMERICA_DEL_SUR_1995 = 'urn:ogc:def:datum:EPSG::6170';

    /**
     * Sistema de Referencia Geocentrico para las AmericaS 2000
     * Type: Geodetic
     * Extent: Latin America - Central America and South America. Brazil
     * ITRF2000 at epoch 2000.40.
     * Realized by a frame of 184 stations observed in 2000 and adjusted in the ITRF2000. Includes ties to tide gauges.
     * Replaces SIRGAS 1995 system for South America; expands SIRGAS to Central America. Name changed in 2001 for use
     * in all of Latin America.
     */
    public const EPSG_SISTEMA_DE_REFERENCIA_GEOCENTRICO_PARA_LAS_AMERICAS_2000 = 'urn:ogc:def:datum:EPSG::6674';

    /**
     * Sistema de Referencia Vertical Nacional 2016
     * Type: Vertical
     * Extent: Argentina - onshore
     * Mean Sea Level 1923 at Mar del Plata defined at station 71 (C = 121.64978 m^2s^-2) = 12.43m for mainland,
     * Ushuaia station PF1N(383) (C = 38.427 m^2s^-2) =  3.915m for Tierra del Fuego. These geopotential numbers
     * correspond with historic values.
     * Replaces SRVN71.
     */
    public const EPSG_SISTEMA_DE_REFERENCIA_VERTICAL_NACIONAL_2016 = 'urn:ogc:def:datum:EPSG::1260';

    /**
     * Sister Islands Geodetic Datum 1961
     * Type: Geodetic
     * Extent: Cayman Islands - Little Cayman and Cayman Brac
     * Fundamental point: LC5. Latitude: 19°39'46.324"N, longitude: 80°03'47.910"W (of Greenwich).
     * Replaced by CIGD11 (datum code 1100).
     */
    public const EPSG_SISTER_ISLANDS_GEODETIC_DATUM_1961 = 'urn:ogc:def:datum:EPSG::6726';

    /**
     * Slovenia Geodetic Datum 1996
     * Type: Geodetic
     * Extent: Slovenia
     * Densification of ETRS89, based on ITRS89 at epoch 1995.55.
     */
    public const EPSG_SLOVENIA_GEODETIC_DATUM_1996 = 'urn:ogc:def:datum:EPSG::6765';

    /**
     * Slovenian Vertical System 2000
     * Type: Vertical
     * Extent: Slovenia - onshore
     * Reference point Ruse defined relative to mean sea level at Trieste in 1875.
     * Normal-orthometric heights. Promulgated through the National Vertical Network adjustment of 1999.
     */
    public const EPSG_SLOVENIAN_VERTICAL_SYSTEM_2000 = 'urn:ogc:def:datum:EPSG::5177';

    /**
     * Slovenian Vertical System 2010
     * Type: Vertical
     * Extent: Slovenia - onshore
     * Mean sea level at Koper over 18.6 years, selected epoch is 2010-10-10.
     * Normal heights. Replaces SVS2000 from 2019-01.
     */
    public const EPSG_SLOVENIAN_VERTICAL_SYSTEM_2010 = 'urn:ogc:def:datum:EPSG::1215';

    /**
     * Solomon 1968
     * Type: Geodetic
     * Extent: Solomon Islands - onshore southern Solomon Islands, primarily Guadalcanal, Malaita, San Cristobel, Santa
     * Isobel, Choiseul, Makira-Ulawa
     * Fundamental point: GUX 1.
     */
    public const EPSG_SOLOMON_1968 = 'urn:ogc:def:datum:EPSG::6718';

    /**
     * Sonatrach Reference Frame 2020
     * Type: Geodetic
     * Extent: Algeria
     * Aligned with IGS14 at epoch 2020.15.  RGSH2020 primary network of 22 stations throughout Algeria connected to 15
     * IGS stations.
     * Internal accuracy of network is 6-8mm.
     */
    public const EPSG_SONATRACH_REFERENCE_FRAME_2020 = 'urn:ogc:def:datum:EPSG::1355';

    /**
     * South Africa Land Levelling Datum
     * Type: Vertical
     * Extent: South Africa - mainland onshore
     * Mean Sea Level at Cape Town harbour 1900 and 1907, referred to Datum Benchmark BM1.
     * Orthometric heights.
     */
    public const EPSG_SOUTH_AFRICA_LAND_LEVELLING_DATUM = 'urn:ogc:def:datum:EPSG::1262';

    /**
     * South American Datum 1969
     * Type: Geodetic
     * Extent: Brazil. In rest of South America - onshore north of approximately 45°S and Tierra del Fuego
     * Fundamental point: Chua. Geodetic latitude: 19°45'41.6527"S; geodetic longitude: 48°06'04.0639"W (of
     * Greenwich). (Astronomic coordinates: Latitude 19°45'41.34"S +/- 0.05", longitude 48°06'07.80"W +/- 0.08").
     * SAD69 uses GRS 1967 ellipsoid but with 1/f to exactly 2 decimal places. In Brazil only, replaced by SAD69(96)
     * (datum code 1075).
     */
    public const EPSG_SOUTH_AMERICAN_DATUM_1969 = 'urn:ogc:def:datum:EPSG::6618';

    /**
     * South American Datum 1969(96)
     * Type: Geodetic
     * Extent: Brazil. Includes Rocas, Fernando de Noronha archipelago, Trindade, Ihlas Martim Vaz and Sao Pedro e Sao
     * Paulo
     * Fundamental point: Chua. Geodetic latitude: 19°45'41.6527"S; geodetic longitude: 48°06'04.0639"W (of
     * Greenwich). (Astronomic coordinates: Latitude 19°45'41.34"S +/- 0.05", longitude 48°06'07.80"W +/- 0.08").
     * SAD69 uses GRS 1967 ellipsoid but with 1/f to exactly 2 decimal places. Replaces original 1969 adjustment (datum
     * code 6618) in Brazil.
     */
    public const EPSG_SOUTH_AMERICAN_DATUM_1969_96 = 'urn:ogc:def:datum:EPSG::1075';

    /**
     * South East Island 1943
     * Type: Geodetic
     * Extent: Seychelles - Mahe, Silhouette, North, Aride Island, Praslin, La Digue and Frigate islands including
     * adjacent smaller granitic islands on the Seychelles Bank, Bird Island and Denis Island
     * Fundamental point: Challenger Astro near Port Victoria lighthouse. Latitude: 4°40'39.460"S, longitude:
     * 55°32'00.166"E (of Greenwich).
     * Network readjusted in 1958-59 and extended to Bird and Denis islands in 1975.
     */
    public const EPSG_SOUTH_EAST_ISLAND_1943 = 'urn:ogc:def:datum:EPSG::1138';

    /**
     * South Georgia 1968
     * Type: Geodetic
     * Extent: South Georgia and the South Sandwich Islands - South Georgia onshore
     * Fundamental point: ISTS 061.
     */
    public const EPSG_SOUTH_GEORGIA_1968 = 'urn:ogc:def:datum:EPSG::6722';

    /**
     * South Yemen
     * Type: Geodetic
     * Extent: Yemen - South Yemen onshore mainland.
     */
    public const EPSG_SOUTH_YEMEN = 'urn:ogc:def:datum:EPSG::6164';

    /**
     * Sri Lanka Datum 1999
     * Type: Geodetic
     * Extent: Sri Lanka - onshore
     * Fundamental point: ISM Diyatalawa. Latitude: 6°49'02.687"N, longitude: 80°57'40.880"E.
     * Introduced in 2000.
     */
    public const EPSG_SRI_LANKA_DATUM_1999 = 'urn:ogc:def:datum:EPSG::1053';

    /**
     * Sri Lanka Vertical Datum
     * Type: Vertical
     * Extent: Sri Lanka - onshore
     * MSL at Colombo 1884-1889.
     * Normal-orthometric heights, but often referred to as "orthometric".
     */
    public const EPSG_SRI_LANKA_VERTICAL_DATUM = 'urn:ogc:def:datum:EPSG::1054';

    /**
     * St. George Island
     * Type: Geodetic
     * Extent: USA - Alaska - Pribilof Islands - St George Island
     * Fundamental point latitude: 56°36'11.31"N, longitude: 169°32'36.00"W (of Greenwich).
     * Many Alaskan islands were never on NAD27 but rather on independent datums. NADCON conversion program provides
     * transformation from St. George Island Datum to NAD83 (original 1986 realization) - making the transformation
     * appear to user as if from NAD27.
     */
    public const EPSG_ST_GEORGE_ISLAND = 'urn:ogc:def:datum:EPSG::6138';

    /**
     * St. Helena Geodetic Datum 2015
     * Type: Geodetic
     * Extent: St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore
     * ITRF2008 at epoch 2015.0. ITRF2008 coordinates (15°56'33.1198"S, 5°40'02.4412"W, 453.183m ellipsoid height) of
     * Longwood IGS CORS station STHL on 1st January 2015.
     * Developed by Richard Stanaway, Quickclose Pty Ltd, superseding Astro DOS 71 from 1st January 2016.
     */
    public const EPSG_ST_HELENA_GEODETIC_DATUM_2015 = 'urn:ogc:def:datum:EPSG::1174';

    /**
     * St. Helena Tritan
     * Type: Geodetic
     * Extent: St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore
     * WGS 84(G1150) at epoch 2011.773. WGS 84 coordinates (15°56'33.1217"S, 5°40'02.4436"W, 453.288m ellipsoid
     * height) of Longwood IGS CORS station STHL on 9th October 2011.
     */
    public const EPSG_ST_HELENA_TRITAN = 'urn:ogc:def:datum:EPSG::1173';

    /**
     * St. Helena Tritan Vertical Datum 2011
     * Type: Vertical
     * Extent: St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore
     * MSL defined by Longwood IGS station STHL reference level of 436.215m.
     * Defined by offset of -17.073m applied to St. Helena Tritan ellipsiodal height (CRS code 7880).
     */
    public const EPSG_ST_HELENA_TRITAN_VERTICAL_DATUM_2011 = 'urn:ogc:def:datum:EPSG::1176';

    /**
     * St. Helena Vertical Datum 2015
     * Type: Vertical
     * Extent: St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore
     * Longwood IGS station STHL reference level of 436.312m.
     * Defined by SHGEOID15 geoid model (transformation code 7891) applied to SHGD2015 (CRS code 7885).
     */
    public const EPSG_ST_HELENA_VERTICAL_DATUM_2015 = 'urn:ogc:def:datum:EPSG::1177';

    /**
     * St. Kilda
     * Type: Vertical
     * Extent: UK - Great Britain - Scotland - St Kilda onshore
     * Orthometric heights.
     */
    public const EPSG_ST_KILDA = 'urn:ogc:def:datum:EPSG::5145';

    /**
     * St. Kitts 1955
     * Type: Geodetic
     * Extent: St Kitts and Nevis - onshore
     * Fundamental point: station K12.
     */
    public const EPSG_ST_KITTS_1955 = 'urn:ogc:def:datum:EPSG::6605';

    /**
     * St. Lawrence Island
     * Type: Geodetic
     * Extent: USA - Alaska - St Lawrence Island
     * Many Alaskan islands were never on NAD27 but rather on independent datums. NADCON conversion program provides
     * transformation from St. Lawrence Island Datum to NAD83 (original 1986 realization) - making the transformation
     * appear to user as if from NAD27.
     */
    public const EPSG_ST_LAWRENCE_ISLAND = 'urn:ogc:def:datum:EPSG::6136';

    /**
     * St. Lucia 1955
     * Type: Geodetic
     * Extent: St Lucia - onshore
     * Fundamental point: station DCS3.
     */
    public const EPSG_ST_LUCIA_1955 = 'urn:ogc:def:datum:EPSG::6606';

    /**
     * St. Marys
     * Type: Vertical
     * Extent: UK - Great Britain - England - Isles of Scilly onshore
     * Mean Sea Level at St. Marys 1887. Initially realised through levelling network adjustment, from 2002 redefined
     * to be realised through OSGM geoid model.
     * Orthometric heights.
     */
    public const EPSG_ST_MARYS = 'urn:ogc:def:datum:EPSG::5147';

    /**
     * St. Paul Island
     * Type: Geodetic
     * Extent: USA - Alaska - Pribilof Islands - St Paul Island
     * Fundamental point latitude: 57°07'16.86"N, longitude: 170°16'24.00"W (of Greenwich).
     * Many Alaskan islands were never on NAD27 but rather on independent datums. NADCON conversion program provides
     * transformation from St. Paul Island Datum to NAD83 (original 1986 realization) - making the transformation
     * appear to user as if from NAD27.
     */
    public const EPSG_ST_PAUL_ISLAND = 'urn:ogc:def:datum:EPSG::6137';

    /**
     * St. Stephen (Ferro)
     * Type: Geodetic
     * Extent: Austria - Lower Austria. Czechia - Moravia and Czech Silesia
     * Fundamental point: St. Stephen's cathedral, Vienna. Latitude: 48°12'31.54"N, longitude: 34°02'27.32"E (of
     * Ferro).
     */
    public const EPSG_ST_STEPHEN_FERRO = 'urn:ogc:def:datum:EPSG::1189';

    /**
     * St. Vincent 1945
     * Type: Geodetic
     * Extent: St Vincent and the northern Grenadine Islands - onshore
     * Fundamental point: station V1, Fort Charlotte.
     */
    public const EPSG_ST_VINCENT_1945 = 'urn:ogc:def:datum:EPSG::6607';

    /**
     * Staatlichen Nivellementnetzes 1976
     * Type: Vertical
     * Extent: Germany - states of former East Germany - Berlin, Brandenburg; Mecklenburg-Vorpommern; Sachsen;
     * Sachsen-Anhalt; Thuringen
     * Network adjusted in 1976. Height at reference point Hoppegarten defined as 1957 value from the UPLN adjustment.
     * Datum at Kronstadt is mean sea level of Baltic in 1833.
     * Introduced in 1979. Uses Normal heights. Replaced by DHHN92.
     */
    public const EPSG_STAATLICHEN_NIVELLEMENTNETZES_1976 = 'urn:ogc:def:datum:EPSG::5183';

    /**
     * Stewart Island 1977
     * Type: Vertical
     * Extent: New Zealand - Stewart Island
     * MSL at 3-5 high and low tides at two different locations.
     */
    public const EPSG_STEWART_ISLAND_1977 = 'urn:ogc:def:datum:EPSG::5170';

    /**
     * Stockholm 1938
     * Type: Geodetic
     * Extent: Sweden - onshore
     * Fundamental point: Stockholm observatory.
     * Replaced by RT90 adjustment (datum code 6124).
     */
    public const EPSG_STOCKHOLM_1938 = 'urn:ogc:def:datum:EPSG::6308';

    /**
     * Stockholm 1938 (Stockholm)
     * Type: Geodetic
     * Extent: Sweden - onshore
     * Fundamental point: Stockholm observatory
     * Replaced by RT90 adjustment (datum code 6124).
     */
    public const EPSG_STOCKHOLM_1938_STOCKHOLM = 'urn:ogc:def:datum:EPSG::6814';

    /**
     * Stornoway
     * Type: Vertical
     * Extent: UK - Great Britain - Scotland - Outer Hebrides onshore
     * Mean Sea Level at Stornoway 1977 correlated to pre-1900. Initially realised through levelling network
     * adjustment, from 2002 redefined to be realised through OSGM geoid model.
     * Orthometric heights.
     */
    public const EPSG_STORNOWAY = 'urn:ogc:def:datum:EPSG::5144';

    /**
     * Sule Skerry
     * Type: Vertical
     * Extent: UK - Great Britain - Scotland - Sule Skerry onshore
     * Orthometric heights.
     */
    public const EPSG_SULE_SKERRY = 'urn:ogc:def:datum:EPSG::5142';

    /**
     * Svalbard vertical datum 2006
     * Type: Vertical
     * Extent: Arctic (Norway (Svalbard)) - between 81°10'N and 76°10'N
     * Mean Sea Level (MSL) at Ny-Ålesund. The SVD2006 surface (arcgp-2006-sk) is the Arctic Gravity Project 2006
     * (arcgp-2006) surface adjusted to two benchmarks tied to the Ny-Ålesund tide gauge. arcgp-2006-sk=arcgp-2006 -
     * 0.8986m.
     */
    public const EPSG_SVALBARD_VERTICAL_DATUM_2006 = 'urn:ogc:def:datum:EPSG::1323';

    /**
     * Swiss Terrestrial Reference System 1995
     * Type: Geodetic
     * Extent: Liechtenstein; Switzerland
     * ETRF89 at epoch 1993.0.
     * First realized through CHTRF95 and subsequently CHTRF98, 2004, 2010 and 2016 with an aim to re-measure every 6
     * years.
     */
    public const EPSG_SWISS_TERRESTRIAL_REFERENCE_SYSTEM_1995 = 'urn:ogc:def:datum:EPSG::6151';

    /**
     * System 34 Jylland Intermediate Datum
     * Type: Geodetic
     * Extent: Denmark - Jutland and Funen - onshore
     * S34 fundamental point: Agri Bavnehøj, latitude 56°13'48.217"N, longitude 2°02'22.629"W of Copenhagen meridian
     * where FE=FN=200000m. This reconstruction's origin in central Zealand was obtained from inversion of an older
     * polynomial transformation to ED50.
     * Created in 2022 to support artificial CRS S34J-IRF in the transformation of coordinates between the historic CRS
     * S34J and ETRS89. The data is a reconstruction based on information synthesized in historical empirical
     * transformations to ED50.
     */
    public const EPSG_SYSTEM_34_JYLLAND_INTERMEDIATE_DATUM = 'urn:ogc:def:datum:EPSG::1332';

    /**
     * System 34 Sjaelland Intermediate Datum
     * Type: Geodetic
     * Extent: Denmark - Zealand and Lolland (onshore)
     * S34 fundamental point: Agri Bavnehøj, latitude 56°13'48.217"N, longitude 2°02'22.629"W of Copenhagen meridian
     * where FE=FN=200000m. This reconstruction's origin in central Zealand was obtained from inversion of an older
     * polynomial transformation to ED50.
     * Created in 2022 to support intermediate CRS S34S-IRF in the transformation of coordinates between the historic
     * CRS S34S and ETRS89. The data is a reconstruction based on information synthesized in historical empirical
     * transformations to ED50.
     */
    public const EPSG_SYSTEM_34_SJAELLAND_INTERMEDIATE_DATUM = 'urn:ogc:def:datum:EPSG::1337';

    /**
     * System 45 Bornholm Intermediate Datum
     * Type: Geodetic
     * Extent: Denmark - Bornholm onshore
     * Pseudo origin south of Bornholm, obtained from inversion of an older transformation. The historical Danish
     * System 45 was ad-hoc and not based on any formal datum and projection definitions.
     * Created in 2022 to support intermediate CRS S45B-IRF in the transformation of coordinates between the historic
     * CRS S45 and ETRS89. The data are reconstructions based on information synthesized in historical empirical
     * transformations to ED50.
     */
    public const EPSG_SYSTEM_45_BORNHOLM_INTERMEDIATE_DATUM = 'urn:ogc:def:datum:EPSG::1346';

    /**
     * System of the Unified Trigonometrical Cadastral Network
     * Type: Geodetic
     * Extent: Czechia; Slovakia
     * Modification of Austrian MGI datum, code 6312.
     */
    public const EPSG_SYSTEM_OF_THE_UNIFIED_TRIGONOMETRICAL_CADASTRAL_NETWORK = 'urn:ogc:def:datum:EPSG::6156';

    /**
     * System of the Unified Trigonometrical Cadastral Network (Ferro)
     * Type: Geodetic
     * Extent: Czechia; Slovakia
     * Modification of Austrian MGI (Ferro) datum.
     */
    public const EPSG_SYSTEM_OF_THE_UNIFIED_TRIGONOMETRICAL_CADASTRAL_NETWORK_FERRO = 'urn:ogc:def:datum:EPSG::6818';

    /**
     * System of the Unified Trigonometrical Cadastral Network [JTSK03]
     * Type: Geodetic
     * Extent: Slovakia.
     */
    public const EPSG_SYSTEM_OF_THE_UNIFIED_TRIGONOMETRICAL_CADASTRAL_NETWORK_JTSK03 = 'urn:ogc:def:datum:EPSG::1201';

    /**
     * System of the Unified Trigonometrical Cadastral Network/05
     * Type: Geodetic
     * Extent: Czechia
     * Constrained to S-JTSK but realised through readjustment in projected CRS domain. Related to ETRS89 R05
     * realisation through transformation code 5226.
     */
    public const EPSG_SYSTEM_OF_THE_UNIFIED_TRIGONOMETRICAL_CADASTRAL_NETWORK_05 = 'urn:ogc:def:datum:EPSG::1052';

    /**
     * System of the Unified Trigonometrical Cadastral Network/05 (Ferro)
     * Type: Geodetic
     * Extent: Czechia
     * Constrained to S-JTSK but realised through readjustment in projected CRS domain.
     */
    public const EPSG_SYSTEM_OF_THE_UNIFIED_TRIGONOMETRICAL_CADASTRAL_NETWORK_05_FERRO = 'urn:ogc:def:datum:EPSG::1055';

    /**
     * TM65
     * Type: Geodetic
     * Extent: Ireland - onshore. UK - Northern Ireland (Ulster) - onshore
     * Adjusted to best mean fit 12 stations of the OSNI 1952 primary adjustment.
     * Differences between OSNI 1952 and TM65 at these stations are RMS 0.25m east, 0.23m north, maximum vector 0.57m.
     * TM65 replaced by and not to be confused with Geodetic Datum of 1965 alias 1975 Mapping Adjustment or TM75 (datum
     * code 6300).
     */
    public const EPSG_TM65 = 'urn:ogc:def:datum:EPSG::6299';

    /**
     * TPEN11 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the Trans-Pennine rail route from Liverpool via Manchester to Bradford and Leeds
     * Defined through the application of the TPEN11 NTv2 transformation (code 9365) to ETRS89 as realized through
     * OSNet v2009 CORS.
     * Created in 2020 to support intermediate CRS "TPEN11-IRF" in the emulation of the combined TPEN11 Snake and
     * TPEN11ext Snake map projections.
     */
    public const EPSG_TPEN11_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1266';

    /**
     * Tahaa 54
     * Type: Geodetic
     * Extent: French Polynesia - Society Islands - Bora Bora, Huahine, Raiatea and Tahaa
     * Fundamental point: Tahaa East Base. Latitude: 16°33'20.97"S, longitude: 151°29'06.25"W (of Greenwich).
     * Replaced by RGPF (datum code 6687).
     */
    public const EPSG_TAHAA_54 = 'urn:ogc:def:datum:EPSG::6629';

    /**
     * Tahaa SAU 2001
     * Type: Vertical
     * Extent: French Polynesia - Society Islands - Tahaa
     * Fundamental benchmark: RN16
     * Included as part of NGPF - see datum code 5195.
     */
    public const EPSG_TAHAA_SAU_2001 = 'urn:ogc:def:datum:EPSG::5201';

    /**
     * Tahiti 52
     * Type: Geodetic
     * Extent: French Polynesia - Society Islands - Moorea and Tahiti
     * Fundamental point: Tahiti North Base. Latitude: 17°38'10.0"S, longitude: 149°36'57.8"W (of Greenwich).
     * Replaced by Tahiti 79 (datum code 6690) in Tahiti and Moorea 87 (code 6691) in Moorea.
     */
    public const EPSG_TAHITI_52 = 'urn:ogc:def:datum:EPSG::6628';

    /**
     * Tahiti 79
     * Type: Geodetic
     * Extent: French Polynesia - Society Islands - Tahiti
     * Fundamental point: Tahiti North Base. Latitude: 17°38'10.0"S, longitude: 149°36'57.8"W (of Greenwich).
     * Replaces Tahiti 52 (datum code 6628) in Tahiti. Replaced by RGPF (datum code 6687).
     */
    public const EPSG_TAHITI_79 = 'urn:ogc:def:datum:EPSG::6690';

    /**
     * Taiwan Datum 1967
     * Type: Geodetic
     * Extent: Taiwan, Republic of China - onshore - Taiwan Island, Penghu (Pescadores) Islands
     * Fundamental point: Hu Tzu Shan. Latitude: 23°58'32.34"N, longitude: 120°58'25.975"E (of Greenwich).
     * Adopted in 1980. TWD67 uses the GRS 1967 ellipsoid but with 1/f to exactly 2 decimal places.
     */
    public const EPSG_TAIWAN_DATUM_1967 = 'urn:ogc:def:datum:EPSG::1025';

    /**
     * Taiwan Datum 1997
     * Type: Geodetic
     * Extent: Taiwan, Republic of China - Taiwan Island, Penghu (Pescadores) Islands
     * ITRF94 at epoch 1997.0
     * Adopted in 1998.
     */
    public const EPSG_TAIWAN_DATUM_1997 = 'urn:ogc:def:datum:EPSG::1026';

    /**
     * Taiwan Vertical Datum 2001
     * Type: Vertical
     * Extent: Taiwan, Republic of China - onshore - Taiwan Island
     * Mean Sea Level at Keelung between 1957 and 1991.
     * Orthometric heights.
     */
    public const EPSG_TAIWAN_VERTICAL_DATUM_2001 = 'urn:ogc:def:datum:EPSG::1224';

    /**
     * Tananarive 1925
     * Type: Geodetic
     * Extent: Madagascar - onshore and nearshore
     * Fundamental point: Tananarive observatory. Latitude: 18°55'02.10"S, longitude: 47°33'06.75"E (of Greenwich).
     */
    public const EPSG_TANANARIVE_1925 = 'urn:ogc:def:datum:EPSG::6297';

    /**
     * Tananarive 1925 (Paris)
     * Type: Geodetic
     * Extent: Madagascar - onshore
     * Fundamental point: Tananarive observatory. Latitude: 21.0191667g S, longitude: 50.23849537g E (of Paris).
     */
    public const EPSG_TANANARIVE_1925_PARIS = 'urn:ogc:def:datum:EPSG::6810';

    /**
     * Tapi Aike
     * Type: Geodetic
     * Extent: Argentina - Santa Cruz province south of approximately 50°20'S
     * Replaced by Campo Inchauspe (code 6221) for topographic mapping, use for oil exploration and production
     * continues.
     */
    public const EPSG_TAPI_AIKE = 'urn:ogc:def:datum:EPSG::1257';

    /**
     * Taranaki 1970
     * Type: Vertical
     * Extent: New Zealand - North Island - Taranaki vertical CRS area
     * MSL at Taranaki harbour 1918-1921.
     */
    public const EPSG_TARANAKI_1970 = 'urn:ogc:def:datum:EPSG::5167';

    /**
     * Tararu 1952
     * Type: Vertical
     * Extent: New Zealand - North Island - Tararu vertical CRS area
     * MSL at Tararu Point 1922-1923.
     */
    public const EPSG_TARARU_1952 = 'urn:ogc:def:datum:EPSG::5166';

    /**
     * Tenerife
     * Type: Vertical
     * Extent: Spain - Canary Islands - Tenerife onshore
     * Mean Sea Level at Santa Cruz de Tenerife harbour between 1960 and 1970.
     * Orthometric heights.
     */
    public const EPSG_TENERIFE = 'urn:ogc:def:datum:EPSG::1281';

    /**
     * Tern Island 1961
     * Type: Geodetic
     * Extent: USA - Hawaii - Tern Island and Sorel Atoll
     * Fundamental point: station FRIG on tern island, station B4 on Sorol Atoll.
     * Two independent astronomic determinations considered to be consistent through adoption of common transformation
     * to WGS 84 (see tfm code 15795).
     */
    public const EPSG_TERN_ISLAND_1961 = 'urn:ogc:def:datum:EPSG::6707';

    /**
     * Tete
     * Type: Geodetic
     * Extent: Mozambique - onshore
     * Fundamental point: Tete.
     */
    public const EPSG_TETE = 'urn:ogc:def:datum:EPSG::6127';

    /**
     * Timbalai 1948
     * Type: Geodetic
     * Extent: Brunei; Malaysia - East Malaysia (Sabah; Sarawak)
     * Fundamental point: Station P85 at Timbalai. Latitude: 5°17' 3.548"N, longitude: 115°10'56.409"E (of
     * Greenwich).
     * In 1968, the original adjustment was densified in Sarawak and extended to Sabah.
     */
    public const EPSG_TIMBALAI_1948 = 'urn:ogc:def:datum:EPSG::6298';

    /**
     * Tokyo
     * Type: Geodetic
     * Extent: Japan - onshore; North Korea - onshore; South Korea - onshore
     * Fundamental point: Nikon-Keido-Genten. Latitude: 35°39'17.5148"N, longitude: 139°44'40.5020"E (of Greenwich).
     * Longitude derived in 1918.
     * In Japan, replaces Tokyo 1892 (code 1048) and replaced by Japanese Geodetic Datum 2000 (code 6611). In Korea
     * used only for geodetic applications before being replaced by Korean 1985 (code 6162).
     */
    public const EPSG_TOKYO = 'urn:ogc:def:datum:EPSG::6301';

    /**
     * Tokyo 1892
     * Type: Geodetic
     * Extent: Japan - onshore; North Korea - onshore; South Korea - onshore
     * Fundamental point: Nikon-Keido-Genten. Latitude: 35°39'17.5148"N, longitude: 139°44'30.0970"E (of Greenwich).
     * Longitude derived in 1892.
     * Extended from Japan to Korea in 1898. In Japan replaced by Tokyo 1918 (datum code 6301). In South Korea replaced
     * by Tokyo 1918 (code 6301) only for geodetic purposes; for all other purposes replaced by Korean 1985 (code
     * 6162).
     */
    public const EPSG_TOKYO_1892 = 'urn:ogc:def:datum:EPSG::1048';

    /**
     * Tonga Geodetic Datum 2005
     * Type: Geodetic
     * Extent: Tonga
     * Based on ITRF2000 at epoch 2005.0.
     */
    public const EPSG_TONGA_GEODETIC_DATUM_2005 = 'urn:ogc:def:datum:EPSG::1095';

    /**
     * Trieste
     * Type: Vertical
     * Extent: Bosnia and Herzegovina; Croatia - onshore; Kosovo; Montenegro - onshore; North Macedonia; Serbia;
     * Slovenia - onshore
     * Reference point HM1(BV1)-Trieste defined relative to mean sea level at Trieste in 1875.
     * Normal-orthometric heights. In Croatia replaced by HVRS71 (datum code 5207).
     */
    public const EPSG_TRIESTE = 'urn:ogc:def:datum:EPSG::1050';

    /**
     * Trinidad 1903
     * Type: Geodetic
     * Extent: Trinidad and Tobago - Trinidad
     * Station 00, Harbour Master's Flagstaff, Port of Spain.
     * Trinidad 1903 / Trinidad Grid coordinates (Clarke's links): 333604.30 E, 436366.91 N (Latitude: 10°38'39.01"N,
     * Longitude: 61°30'38.00"W of Greenwich).
     */
    public const EPSG_TRINIDAD_1903 = 'urn:ogc:def:datum:EPSG::6302';

    /**
     * Tristan 1968
     * Type: Geodetic
     * Extent: St Helena, Ascension and Tristan da Cunha - Tristan da Cunha island group including Tristan,
     * Inaccessible, Nightingale, Middle and Stoltenhoff Islands.
     */
    public const EPSG_TRISTAN_1968 = 'urn:ogc:def:datum:EPSG::6734';

    /**
     * Trucial Coast 1948
     * Type: Geodetic
     * Extent: UAE - Abu Dhabi onshore and Dubai onshore
     * Fundamental point: TC1. Latitude: 25°23'50.190"N, longitude: 55°26'43.950"E (of Greenwich).
     */
    public const EPSG_TRUCIAL_COAST_1948 = 'urn:ogc:def:datum:EPSG::6303';

    /**
     * Turkish National Reference Frame
     * Type: Geodetic
     * Extent: Turkey
     * ITRF96 at epoch 2005.0.
     */
    public const EPSG_TURKISH_NATIONAL_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1057';

    /**
     * Tutuila Vertical Datum of 1962
     * Type: Vertical
     * Extent: American Samoa - Tutuila island
     * Mean sea level at Pago Pago harbor, Tutuila, over 10 years 1949-1955 and 1957-1959. Benchmark NO 2 1948 =
     * 7.67ftUS.
     * Replaced by American Samoa Vertical Datum of 2002 (datum code 1125).
     */
    public const EPSG_TUTUILA_VERTICAL_DATUM_OF_1962 = 'urn:ogc:def:datum:EPSG::1121';

    /**
     * Ukraine 2000
     * Type: Geodetic
     * Extent: Ukraine
     * Orientation and scale constrained to be same as ITRF2000 at epoch 2005.0. Position is minimised deviation
     * between reference ellipsoid and quasigeoid in territory of Ukraine.
     */
    public const EPSG_UKRAINE_2000 = 'urn:ogc:def:datum:EPSG::1077';

    /**
     * Vanua Levu 1915
     * Type: Geodetic
     * Extent: Fiji - Vanua Levu and Taveuni
     * Latitude origin was obtained astronomically at station Numuiloa = 16°23'38.36"S, longitude origin was obtained
     * astronomically at station Suva = 178°25'35.835"E.
     * For topographic mapping, replaced by Fiji 1956. For other purposes, replaced by Fiji 1986.
     */
    public const EPSG_VANUA_LEVU_1915 = 'urn:ogc:def:datum:EPSG::6748';

    /**
     * Vientiane 1982
     * Type: Geodetic
     * Extent: Laos
     * Fundamental point: Vientiane (Nongteng) Astro Pillar. Latitude: 18°01'31.6301"N, longitude: 102°30'56.6999"E
     * (of Greenwich).
     * Replaced by Lao 1993.
     */
    public const EPSG_VIENTIANE_1982 = 'urn:ogc:def:datum:EPSG::6676';

    /**
     * Vietnam 2000
     * Type: Geodetic
     * Extent: Vietnam - onshore
     * Point N00, located in the premises of the Land Administration Research Institute, Hoang Quoc Viet Street, Hanoi.
     * Replaces Hanoi 1972.
     */
    public const EPSG_VIETNAM_2000 = 'urn:ogc:def:datum:EPSG::6756';

    /**
     * Virgin Islands Vertical Datum of 2009
     * Type: Vertical
     * Extent: US Virgin Islands - onshore - St Croix, St John, and St Thomas
     * Mean sea level for National Tidal Datum Epoch 1983–2001 at (i) Lime Tree Bay, St. Croix (BM 9751401 M =
     * 3.111m) , (ii) Lameshur Bay, St. John (BM 9751381 TIDAL A = 1.077m) , and (iii) Charlotte Amalie, St. Thomas (BM
     * 9751639 F = 1.552m).
     * Replaces all earlier vertical datums on these islands.
     */
    public const EPSG_VIRGIN_ISLANDS_VERTICAL_DATUM_OF_2009 = 'urn:ogc:def:datum:EPSG::1124';

    /**
     * Viti Levu 1912
     * Type: Geodetic
     * Extent: Fiji - Viti Levu island
     * Latitude origin was obtained astronomically at station Monavatu = 17°53'28.285"S, longitude origin was obtained
     * astronomically at station Suva = 178°25'35.835"E.
     * For topographic mapping, replaced by Fiji 1956. For other purposes, replaced by Fiji 1986.
     */
    public const EPSG_VITI_LEVU_1912 = 'urn:ogc:def:datum:EPSG::6752';

    /**
     * Voirol 1875
     * Type: Geodetic
     * Extent: Algeria - onshore north of 32°N
     * Fundamental point: Voirol. Latitude: 36°45'07.927"N, longitude: 3°02'49.435"E of Greenwich. Uses RGS (and old
     * IGN) value of 2°20'13.95"for Greenwich-Paris meridian difference.
     * Replaced by Voirol 1879 (code 6671).
     */
    public const EPSG_VOIROL_1875 = 'urn:ogc:def:datum:EPSG::6304';

    /**
     * Voirol 1875 (Paris)
     * Type: Geodetic
     * Extent: Algeria - onshore north of 32°N
     * Fundamental point: Voirol. Latitude: 40.83578 grads N, longitude: 0.78873 grads E (of Paris).
     */
    public const EPSG_VOIROL_1875_PARIS = 'urn:ogc:def:datum:EPSG::6811';

    /**
     * Voirol 1879
     * Type: Geodetic
     * Extent: Algeria - onshore north of 32°N
     * Fundamental point: Voirol. Latitude: 36°45'08.199"N, longitude: 3°02'49.435"E (of Greenwich). Uses RGS (and
     * old IGN) value of 2°20'13.95"for Greenwich-Paris meridian difference.
     * Replaces Voirol 1875 (code 6304).
     */
    public const EPSG_VOIROL_1879 = 'urn:ogc:def:datum:EPSG::6671';

    /**
     * Voirol 1879 (Paris)
     * Type: Geodetic
     * Extent: Algeria - onshore north of 32°N
     * Fundamental point: Voirol. Latitude: 40.835864 grads N, longitude: 0.788735 grads E (of Paris).
     * Replaces Voirol 1875 (Paris) (code 6811).
     */
    public const EPSG_VOIROL_1879_PARIS = 'urn:ogc:def:datum:EPSG::6821';

    /**
     * WC05 Intermediate Reference Frame
     * Type: Geodetic
     * Extent: UK - on or related to the west coast mainline rail route from London (Euston) via Carlisle to Glasgow
     * Defined through the application of the WC05 NTv2 transformation from ETRS89 as realized through OSNet v2009
     * CORS.
     * Created in 2024 to support intermediate CRS "WC05-IRF" in the emulation of the WC05 Snake map projection.
     */
    public const EPSG_WC05_INTERMEDIATE_REFERENCE_FRAME = 'urn:ogc:def:datum:EPSG::1386';

    /**
     * WGS 72 Transit Broadcast Ephemeris
     * Type: Dynamic geodetic
     * Extent: World
     * Alleged datum for use with Transit broadcast ephemeris prior to 1989. Relationship to WGS 72 has changed over
     * time.
     */
    public const EPSG_WGS_72_TRANSIT_BROADCAST_EPHEMERIS = 'urn:ogc:def:datum:EPSG::6324';

    /**
     * Waitangi (Chatham Island) 1959
     * Type: Vertical
     * Extent: New Zealand - Chatham Island - onshore
     * MSL at Waitangi harbour collected in 1959.
     */
    public const EPSG_WAITANGI_CHATHAM_ISLAND_1959 = 'urn:ogc:def:datum:EPSG::5169';

    /**
     * Wake Island 1952
     * Type: Geodetic
     * Extent: Wake atoll - onshore.
     */
    public const EPSG_WAKE_ISLAND_1952 = 'urn:ogc:def:datum:EPSG::6733';

    /**
     * Wellington 1953
     * Type: Vertical
     * Extent: New Zealand - North Island - Wellington vertical CRS area
     * MSL at Wellington harbour 1909-1946.
     */
    public const EPSG_WELLINGTON_1953 = 'urn:ogc:def:datum:EPSG::5168';

    /**
     * Wiener Null
     * Type: Vertical
     * Extent: Austria - Vienna city state
     * Historic benchmark on the Schwedenbrücke over an artificial channel of River Danube (Donaukanal) with GHA
     * height of 156.680m.
     */
    public const EPSG_WIENER_NULL = 'urn:ogc:def:datum:EPSG::1267';

    /**
     * World Geodetic System 1966
     * Type: Dynamic geodetic
     * Extent: World
     * Developed from a worldwide distribution of terrestrial and geodetic satellite observations and defined through a
     * set of station coordinates.
     * A worldwide 5° × 5° mean free air gravity anomaly field provided the basic data for producing the WGS 66
     * gravimetric geoid. Replaced by WGS 72.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1966 = 'urn:ogc:def:datum:EPSG::6760';

    /**
     * World Geodetic System 1972
     * Type: Dynamic geodetic
     * Extent: World
     * Developed from a worldwide distribution of terrestrial and geodetic satellite observations and defined through a
     * set of station coordinates.
     * Used by GPS before 1987. For Transit satellite positioning see also WGS 72BE.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1972 = 'urn:ogc:def:datum:EPSG::6322';

    /**
     * World Geodetic System 1984 (G1150)
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of 17 GPS tracking stations adjusted to a subset of 49 IGS stations. Observations
     * made in February 2001. The reference epoch for ITRF2000 is 1997.0; station coordinates were transformed to
     * 2001.0 using IERS station velocities.
     * Replaces World Geodetic System 1984 (G873) from 2002-01-20. Replaced by World Geodetic System 1984 (G1674) from
     * 2012-02-08.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1984_G1150 = 'urn:ogc:def:datum:EPSG::1154';

    /**
     * World Geodetic System 1984 (G1674)
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of 15 GPS tracking stations adjusted to a subset of IGS stations at epoch 2005.0.
     * The IGS station coordinates are considered to be equivalent to ITRF2008.
     * Replaces World Geodetic System 1984 (G1150) from 2012-02-08. Replaced by World Geodetic System 1984 (G1762) from
     * 2013-10-16.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1984_G1674 = 'urn:ogc:def:datum:EPSG::1155';

    /**
     * World Geodetic System 1984 (G1762)
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of 19 GPS tracking stations adjusted to a subset of IGb08 stations at epoch 2005.0
     * using observations made in May 2013. The IGb08 coordinates are considered to be equivalent to ITRF2008.
     * Replaces WGS 84 (G1674) from 2013-10-16. Frame was redesignated WGS 84 (G1762') after coordinates of 7 NGA
     * tracking stations were changed following station moves and antenna updates 2014-08 to 2015-06. Replaced by WGS
     * 84 (G2139) from 2021-01-03.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1984_G1762 = 'urn:ogc:def:datum:EPSG::1156';

    /**
     * World Geodetic System 1984 (G2139)
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of 19 GPS tracking stations aligned with a subset of IGb14 stations at epoch 2016.0.
     * The IGb14 station coordinates are considered to be equivalent to ITRF2014.
     * Replaces World Geodetic System 1984 (G1762) from 2021-01-03. Tracking station coordinate changes on 2021-03-28
     * when NGA implemented IGS definition of antenna phase centre offset. Replaced by  World Geodetic System 1984
     * (G2296) from 2024-01-07.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1984_G2139 = 'urn:ogc:def:datum:EPSG::1309';

    /**
     * World Geodetic System 1984 (G2296)
     * Type: Dynamic geodetic
     * Extent: World
     * Aligned to IGS20 through a 7.4 year (2016-01 to 2023-05) time series of daily positions and derived velocities
     * of the 17 WGS 84 tracking stations, determined by Precise Point Positioning (PPP) using IGS precise orbits,
     * clocks and antenna calibrations.
     * WGS 84 (G2296) is considered to be aligned to IGS20 and  ITRF2020 at all epochs. Replaces World Geodetic System
     * 1984 (G2139) from 2024-01-07.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1984_G2296 = 'urn:ogc:def:datum:EPSG::1383';

    /**
     * World Geodetic System 1984 (G730)
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of 10 GPS tracking stations adjusted to a subset of ITRF92 stations at epoch 1994.0.
     * The reference epoch for ITRF92 is 1988.0; the ITRF92 station coordinates were transformed to 1994.0 using the
     * NNR-NUVEL1 plate motion model.
     * Replaces the original Transit-derived World Geodetic System 1984 from 1994-06-29. Replaced by World Geodetic
     * System 1984 (G873) from 1997-01-29.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1984_G730 = 'urn:ogc:def:datum:EPSG::1152';

    /**
     * World Geodetic System 1984 (G873)
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of 13 GPS tracking stations adjusted to a subset of ITRF94 stations at epoch 1997.0.
     * The reference epoch for the adjustment was 1994.0 and the coordinates were propagated to 1997.0 using the
     * NNR-NUVEL-1A plate motion model.
     * Replaces World Geodetic System 1984 (G730) from 1997-01-29. Replaced by World Geodetic System 1984 (G1150) from
     * 2002-01-20.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1984_G873 = 'urn:ogc:def:datum:EPSG::1153';

    /**
     * World Geodetic System 1984 (Transit)
     * Type: Dynamic geodetic
     * Extent: World
     * Defined through coordinates of 5 GPS tracking stations in the Transit doppler positioning NSWC 9Z-2 reference
     * frame transformed to be aligned to the BIH Conventional Terrestrial Reference Frame (BTS) at epoch 1984.0.
     * The NSWC 9Z-2 origin shifted by -4.5 m along the Z-axis, scale changed by -0.6 x 10E-6 and the reference
     * meridian rotated westward by 0.814" to be aligned to the BTS at epoch 1984.0. Replaced by World Geodetic System
     * 1984 (G730) from 1994-06-29.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1984_TRANSIT = 'urn:ogc:def:datum:EPSG::1166';

    /**
     * World Geodetic System 1984 ensemble
     * Type: Ensemble
     * Extent: World
     * EPSG::6326 has been the then current realization. No distinction is made between the original and subsequent
     * (G730, G873, G1150, G1674, G1762, G2139 and G2296) WGS 84 frames. Since 1997, WGS 84 has been maintained within
     * 10cm of the then current ITRF.
     */
    public const EPSG_WORLD_GEODETIC_SYSTEM_1984_ENSEMBLE = 'urn:ogc:def:datum:EPSG::6326';

    /**
     * Xian 1980
     * Type: Geodetic
     * Extent: China - onshore
     * Xian observatory.
     */
    public const EPSG_XIAN_1980 = 'urn:ogc:def:datum:EPSG::6610';

    /**
     * Yacare
     * Type: Geodetic
     * Extent: Uruguay - onshore
     * Fundamental point: Yacare. Latitude: 30°35'53.68"S, longitude: 57°25'01.30"W (of Greenwich).
     */
    public const EPSG_YACARE = 'urn:ogc:def:datum:EPSG::6309';

    /**
     * Yellow Sea 1956
     * Type: Vertical
     * Extent: China - onshore
     * 2 years tide readings at Qingdao.
     * Replaced by Yellow Sea 1985 datum.
     */
    public const EPSG_YELLOW_SEA_1956 = 'urn:ogc:def:datum:EPSG::5104';

    /**
     * Yellow Sea 1985
     * Type: Vertical
     * Extent: China - onshore
     * 20 years tide readings at Qingdao.
     * Replaces Yellow Sea 1956 datum.
     */
    public const EPSG_YELLOW_SEA_1985 = 'urn:ogc:def:datum:EPSG::5137';

    /**
     * Yemen National Geodetic Network 1996
     * Type: Geodetic
     * Extent: Yemen
     * Sana'a IGN reference marker.
     */
    public const EPSG_YEMEN_NATIONAL_GEODETIC_NETWORK_1996 = 'urn:ogc:def:datum:EPSG::6163';

    /**
     * Yoff
     * Type: Geodetic
     * Extent: Senegal
     * Fundamental point: Yoff. Latitude: 14°44'41.62"N, longitude: 17°29'07.02"W (of Greenwich).
     */
    public const EPSG_YOFF = 'urn:ogc:def:datum:EPSG::6310';

    /**
     * Zanderij
     * Type: Geodetic
     * Extent: Suriname.
     */
    public const EPSG_ZANDERIJ = 'urn:ogc:def:datum:EPSG::6311';

    /**
     * Fk89
     * Type: Geodetic
     * Extent: Faroe Islands - onshore
     * Replaces FD54 for cadastre.
     */
    public const EPSG_FK89 = 'urn:ogc:def:datum:EPSG::6753';

    /**
     * @deprecated use EPSG_LUXEMBOURG_REFERENCE_FRAME instead
     */
    public const EPSG_LUXEMBOURG_1930 = 'urn:ogc:def:datum:EPSG::6181';

    /**
     * @deprecated use EPSG_NIVELLEMENT_GENERAL_DU_LUXEMBOURG_1995 instead
     */
    public const EPSG_NIVELLEMENT_GENERAL_DU_LUXEMBOURG = 'urn:ogc:def:datum:EPSG::5172';

    /**
     * @deprecated use EPSG_CANADIAN_GEODETIC_VERTICAL_DATUM_OF_2013_CGG2013A_EPOCH_2010 instead
     */
    public const EPSG_CANADIAN_GEODETIC_VERTICAL_DATUM_OF_2013_CGG2013A = 'urn:ogc:def:datum:EPSG::1256';

    /**
     * @deprecated use EPSG_INDONESIAN_GEOID_2020_VERSION_1 instead
     */
    public const EPSG_INDONESIAN_GEOID_2020 = 'urn:ogc:def:datum:EPSG::1294';

    /**
     * @deprecated use EPSG_LATVIAN_GEODETIC_COORDINATE_SYSTEM_1992 instead
     */
    public const EPSG_LATVIA_1992 = 'urn:ogc:def:datum:EPSG::6661';

    /**
     * @deprecated use EPSG_KOREAN_VERTICAL_DATUM_1964 instead
     */
    public const EPSG_INCHEON = 'urn:ogc:def:datum:EPSG::1049';

    /**
     * @deprecated use EPSG_KOREAN_GEODETIC_DATUM_2002 instead
     */
    public const EPSG_GEOCENTRIC_DATUM_OF_KOREA = 'urn:ogc:def:datum:EPSG::6737';

    /**
     * @deprecated use EPSG_CAIS_DA_FIGUEIRINHA instead
     */
    public const EPSG_CAIS_DA_FIGUEIRINHA_ANGRA_DO_HEROISMO = 'urn:ogc:def:datum:EPSG::1107';

    /**
     * @deprecated use EPSG_CAIS_DA_PONTINHA instead
     */
    public const EPSG_CAIS_DA_PONTINHA_FUNCHAL = 'urn:ogc:def:datum:EPSG::1101';

    /**
     * @deprecated use EPSG_CAIS_DA_VILA instead
     */
    public const EPSG_CAIS_DA_VILA_PORTO_SANTO = 'urn:ogc:def:datum:EPSG::1102';

    /**
     * @deprecated use EPSG_DANSK_VERTIKAL_REFERENCE_1990_2000 instead
     */
    public const EPSG_DANSK_VERTIKAL_REFERENCE_1990 = 'urn:ogc:def:datum:EPSG::5206';

    /**
     * @var array<string, array{name: string, type: string, ellipsoid: ?string, prime_meridian: ?string, frame_reference_epoch: float|DateTimeInterface|null, ensemble?: array<string>, help: string}>
     */
    protected static array $sridData = [
        'urn:ogc:def:datum:EPSG::1024' => [
            'name' => 'Hungarian Datum 1909',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Hungary',
            'help' => 'Fundamental point not given in information source, but presumably Szolohegy which is origin of later HD72.
Replaced earlier HD1863 adjustment also on Bessel ellipsoid. Both HD1863 and HD1909 were originally on Ferro Prime Meridian but subsequently converted to Greenwich. Replaced by HD72 (datum code 6237).',
        ],
        'urn:ogc:def:datum:EPSG::1025' => [
            'name' => 'Taiwan Datum 1967',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7050',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Taiwan - onshore - mainland and Penghu',
            'help' => 'Fundamental point: Hu Tzu Shan. Latitude: 23°58\'32.34"N, longitude: 120°58\'25.975"E (of Greenwich).
Adopted in 1980. TWD67 uses the GRS 1967 ellipsoid but with 1/f to exactly 2 decimal places.',
        ],
        'urn:ogc:def:datum:EPSG::1026' => [
            'name' => 'Taiwan Datum 1997',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Taiwan',
            'help' => 'ITRF94 at epoch 1997.0
Adopted in 1998.',
        ],
        'urn:ogc:def:datum:EPSG::1027' => [
            'name' => 'EGM2008 geoid',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived through EGM2008 geoid undulation model consisting of spherical harmonic coefficients to degree 2190 and order 2159 applied to the WGS 84 ellipsoid.
Replaces EGM96 geoid (datum code 5171). See transformation codes 3858 and 3859 for 2.5x2.5 and 1x1 arc minute geoid undulation grid files derived from the spherical harmonic coefficients.',
        ],
        'urn:ogc:def:datum:EPSG::1028' => [
            'name' => 'Fao 1979',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iraq - onshore',
            'help' => 'Average sea level at Fao during two-year period in mid/late 1970s.
Levelling network established by Polservice consortium. Replaces Fao (datum code 5149) in Iraq.',
        ],
        'urn:ogc:def:datum:EPSG::1029' => [
            'name' => 'Iraqi Geospatial Reference System',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iraq',
            'help' => 'ITRF2000 at epoch 1997.0
',
        ],
        'urn:ogc:def:datum:EPSG::1030' => [
            'name' => 'N2000',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Finland - onshore',
            'help' => 'Height at Metsaahovi (latitude 60.21762°N, longitude 24.39517°E) of 54.4233m related to EVRF2000 origin through Baltic Levelling Ring adjustment at epoch 2000.0.
Realized through the third precise levelling network. Uses normal heights. Replaces N43 and N60 (datum codes 1213 and 5116). To account for isostatic land uplift use NKG2005 model.',
        ],
        'urn:ogc:def:datum:EPSG::1031' => [
            'name' => 'MGI 1901',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - former Yugoslavia onshore',
            'help' => 'Fundamental point: Hermannskogel. Latitude: 48°16\'15.29"N, longitude: 16°17\'55.04"E (of Greenwich).
The longitude of the datum origin equates to the Albrecht 1902 value for the Ferro meridian of 17°39\'46.02" west of Greenwich. Densified in 1948.',
        ],
        'urn:ogc:def:datum:EPSG::1032' => [
            'name' => 'MOLDREF99',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Moldova',
            'help' => 'Densification of ETRS89.
',
        ],
        'urn:ogc:def:datum:EPSG::1033' => [
            'name' => 'Reseau Geodesique de la RDC 2005',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Congo DR (Zaire) - south',
            'help' => 'ITRF2000 at epoch 2005.4.
',
        ],
        'urn:ogc:def:datum:EPSG::1034' => [
            'name' => 'Serbian Reference Network 1998',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Serbia',
            'help' => 'Densification of ETRS89 in Serbia at epoch 1998.7 based on coordinates of 6 stations in Serbia of Yugoslav Reference Frame (YUREF) 1998 campaign.
Observed 1998-2003.',
        ],
        'urn:ogc:def:datum:EPSG::1035' => [
            'name' => 'Red Geodesica de Canarias 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands',
            'help' => 'ITRF93 at epoch 1994.9 at VLBI station INTA at the Canary Spatial Centre (CEC) at Maspalomas on Grand Canary.
Replaces Pico de las Nieves 1968 (PN68) and Pico de las Nieves 1984 (PN84).',
        ],
        'urn:ogc:def:datum:EPSG::1036' => [
            'name' => 'Reseau Geodesique de Mayotte 2004',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mayotte',
            'help' => 'ITRF2000 at epoch 2004.0
Replaces Combani 1950 (datum code 6632) except for cadastral purposes. (Cadastre 1997 (datum code 1037) used for cadastral purposes).',
        ],
        'urn:ogc:def:datum:EPSG::1037' => [
            'name' => 'Cadastre 1997',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mayotte - onshore',
            'help' => 'Coordinates of 1 station of Combani 1950 adjustment held fixed.
Derived by adjustment of GPS-observed network which was constrained to Combani 1950 coordinates of one station.',
        ],
        'urn:ogc:def:datum:EPSG::1038' => [
            'name' => 'Reseau Geodesique de Saint Pierre et Miquelon 2006',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Pierre and Miquelon',
            'help' => 'ITRF2000 at epoch 2006.0
Replaces Saint Pierre et Miquelon 1950 (datum code 6638).',
        ],
        'urn:ogc:def:datum:EPSG::1039' => [
            'name' => 'New Zealand Vertical Datum 2009',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand',
            'help' => 'New Zealand Quasigeoid 2009 which is defined by the application of the NZ geoid 2009 grid to NZGD2000 ellipsoidal heights. See transformation code 4459.
',
        ],
        'urn:ogc:def:datum:EPSG::1040' => [
            'name' => 'Dunedin-Bluff 1960',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - South Island - Dunedin-Bluff vcrs',
            'help' => 'Common adjustment of Dunedin 1958 and Bluff 1955 networks.
',
        ],
        'urn:ogc:def:datum:EPSG::1041' => [
            'name' => 'Autonomous Regions of Portugal 2008',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores and Madeira',
            'help' => 'ITRF93 as derived from the 1994 TransAtlantic Network for Geodynamics and Oceanography (TANGO) project.
Replaces older classical datums for Azores and Madeira archipelagos.',
        ],
        'urn:ogc:def:datum:EPSG::1042' => [
            'name' => 'Mexico ITRF92',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mexico',
            'help' => 'ITRF1992 at epoch 1988.00.
Realized by a frame of 15 active GPS stations observed and adjusted in the ITRF1992. Includes ties to tide gauges. Replaces NAD27 (datum code 6267). Replaced by Mexico ITRF2008 (datum code 1120) from December 2010.',
        ],
        'urn:ogc:def:datum:EPSG::1043' => [
            'name' => 'China 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::1024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China',
            'help' => 'ITRF97 at epoch 2000.0
Combined adjustment of astro-geodetic observations as used for Xian 1980 and GPS control network observed 2000-2003. Adopted July 2008.',
        ],
        'urn:ogc:def:datum:EPSG::1044' => [
            'name' => 'Sao Tome',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sao Tome and Principe - onshore - Sao Tome',
            'help' => 'Fundamental point: Fortaleza. Latitude: 0°20\'49.02"N, longitude: 6°44\'41.85"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::1045' => [
            'name' => 'New Beijing',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - onshore',
            'help' => 'Derived by conformal transformation of Xian 1980 adjustment onto Krassowsky ellipsoid.
From 1982 replaces Beijing 1954.',
        ],
        'urn:ogc:def:datum:EPSG::1046' => [
            'name' => 'Principe',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sao Tome and Principe - onshore - Principe',
            'help' => 'Fundamental point: Morro do Papagaio. Latitude: 1°36\'46.87"N, longitude: 7°23\'39.65"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::1047' => [
            'name' => 'Reseau de Reference des Antilles Francaises 1991',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Caribbean - French Antilles',
            'help' => 'WGS 84 coordinates of a single station determined during the 1988 Tango mission.
Replaces Fort Marigot and Sainte Anne (datum codes 6621-22) in Guadeloupe and Fort Desaix (datum code 6625) in Martinique. Replaced by Reseau Geodesique des Antilles Francaises 2009 (datum code 1073).',
        ],
        'urn:ogc:def:datum:EPSG::1048' => [
            'name' => 'Tokyo 1892',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Japan and Korea',
            'help' => 'Fundamental point: Nikon-Keido-Genten. Latitude: 35°39\'17.5148"N, longitude: 139°44\'30.0970"E (of Greenwich). Longitude derived in 1892.
Extended from Japan to Korea in 1898. In Japan replaced by Tokyo 1918 (datum code 6301). In South Korea replaced by Tokyo 1918 (code 6301) only for geodetic purposes; for all other purposes replaced by Korean 1985 (code 6162).',
        ],
        'urn:ogc:def:datum:EPSG::1049' => [
            'name' => 'Korean Vertical Datum 1964',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Korea, Republic of (South Korea) - onshore',
            'help' => 'MSL 1913-1916 at Incheon Bay for mainland. For far offshore islands the MSL is determined through a local tide gauge.
',
        ],
        'urn:ogc:def:datum:EPSG::1050' => [
            'name' => 'Trieste',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - former Yugoslavia onshore',
            'help' => 'Reference point HM1(BV1)-Trieste defined relative to mean sea level at Trieste in 1875.
Normal-orthometric heights. In Croatia replaced by HVRS71 (datum code 5207).',
        ],
        'urn:ogc:def:datum:EPSG::1051' => [
            'name' => 'Genoa 1942',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Italy - mainland and Sicily',
            'help' => 'Mean Sea Level at Genoa (Ponte Morosini) 1937-1946.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1052' => [
            'name' => 'System of the Unified Trigonometrical Cadastral Network/05',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Czechia',
            'help' => 'Constrained to S-JTSK but realised through readjustment in projected CRS domain. Related to ETRS89 R05 realisation through transformation code 5226.
',
        ],
        'urn:ogc:def:datum:EPSG::1053' => [
            'name' => 'Sri Lanka Datum 1999',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7015',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sri Lanka - onshore',
            'help' => 'Fundamental point: ISM Diyatalawa. Latitude: 6°49\'02.687"N, longitude: 80°57\'40.880"E.
Introduced in 2000.',
        ],
        'urn:ogc:def:datum:EPSG::1054' => [
            'name' => 'Sri Lanka Vertical Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sri Lanka - onshore',
            'help' => 'MSL at Colombo 1884-1889.
Normal-orthometric heights, but often referred to as "orthometric".',
        ],
        'urn:ogc:def:datum:EPSG::1055' => [
            'name' => 'System of the Unified Trigonometrical Cadastral Network/05 (Ferro)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8909',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Czechia',
            'help' => 'Constrained to S-JTSK but realised through readjustment in projected CRS domain.
',
        ],
        'urn:ogc:def:datum:EPSG::1056' => [
            'name' => 'Geocentric Datum Brunei Darussalam 2009',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Brunei',
            'help' => 'ITRF2005 at epoch 2009.45
Replaces use of Timbalai from July 2009.',
        ],
        'urn:ogc:def:datum:EPSG::1057' => [
            'name' => 'Turkish National Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Turkey',
            'help' => 'ITRF96 at epoch 2005.0
',
        ],
        'urn:ogc:def:datum:EPSG::1058' => [
            'name' => 'Bhutan National Geodetic Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bhutan',
            'help' => 'ITRF2000 at epoch 2003.87
',
        ],
        'urn:ogc:def:datum:EPSG::1059' => [
            'name' => 'Faroe Islands Vertical Reference 2009',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Faroe Islands - onshore',
            'help' => '
Mean Tidal Height System.',
        ],
        'urn:ogc:def:datum:EPSG::1060' => [
            'name' => 'Islands Net 2004',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iceland',
            'help' => 'ITRF2000 at epoch 2004.6.
Replaces ISN93 (datum code 6659). Replaced by ISN2016 (datum code 1087).',
        ],
        'urn:ogc:def:datum:EPSG::1061' => [
            'name' => 'International Terrestrial Reference Frame 2008',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2005.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre. The ITRF2008 origin is defined in such a way that there are null translation parameters at epoch 2005.0 and null translation rates between the ITRF2008 and the ILRS SLR time series.
Realization of the IERS Terrestrial Reference System (ITRS) from 2012. Replaces ITRF2005 (code 6896).',
        ],
        'urn:ogc:def:datum:EPSG::1062' => [
            'name' => 'Posiciones Geodesicas Argentinas 2007',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina',
            'help' => 'Coordinates of the geodetic network of 211 high accuracy surveyed points (178 passive and 33 continuously operating) defining the National Geodetic System (Sistema Geodésico Nacional) based on ITRF2005 at epoch 2006.632.
Adopted by order of the Director of the National Geographic Institute on 15th May 2009 as the new National Geodetic Reference Frame. Replaces POSGAR 94.',
        ],
        'urn:ogc:def:datum:EPSG::1063' => [
            'name' => 'Marco Geodesico Nacional de Bolivia',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bolivia',
            'help' => 'IGS05 (ITRF2005) at epoch 2010.2.  Densification of SIRGAS95 network in Bolivia, consisting of 125 passive geodetic stations and 8 continuous recording GPS stations.
Densification of SIRGAS 1995 within Bolivia. Replaces PSAD56 (datum code 6248) in Bolivia.',
        ],
        'urn:ogc:def:datum:EPSG::1064' => [
            'name' => 'SIRGAS-Chile realization 1 epoch 2002',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Chile',
            'help' => 'ITRF2000 at epoch 2002.0.  Densification of SIRGAS 2000 network in Chile, consisting of 650 monumented stations.
Densification of SIRGAS 2000 within Chile. Replaces PSAD56 (datum code 6248) in Chile, HITO XVIII (datum code 6254) in Chilean Tierra del Fuego and Easter Island 1967 (datum code 6719) in Easter Island. Replaced by SIRGAS-Chile 2010 (datum code 1243).',
        ],
        'urn:ogc:def:datum:EPSG::1065' => [
            'name' => 'Costa Rica 2005',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Costa Rica',
            'help' => 'ITRF2000 at epoch 2005.83.  Network of 34 GPS stations throughout the country, five of which were connected to four Caribbean area ITRF stations.
Replaces Ocotepeque (datum code 1070) in Costa Rica from March 2007.',
        ],
        'urn:ogc:def:datum:EPSG::1066' => [
            'name' => 'Sistema Geodesico Nacional de Panama MACARIO SOLIS',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Panama',
            'help' => 'ITRF2000 at epoch 2000.0. Densification of SIRGAS 2000 network in Panama, consisting of 20 GPS stations throughout the country.
',
        ],
        'urn:ogc:def:datum:EPSG::1067' => [
            'name' => 'Peru96',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Peru',
            'help' => 'Densification of SIRGAS95 network (ITRF94 at epoch 1995.4) in Peru, consisting of 47 passive geodetic stations and 3 continuous recording GPS stations.
Densification of SIRGAS 1995 within Peru. Replaces PSAD56 (datum code 6248) in Peru.',
        ],
        'urn:ogc:def:datum:EPSG::1068' => [
            'name' => 'SIRGAS-ROU98',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Uruguay',
            'help' => 'Densification of SIRGAS95 network in Uruguay, consisting of 17 passive geodetic stations and 3 continuous recording GPS stations. ITRF94 at epoch 1995.4.
Densification of SIRGAS 1995 within Uruguay. Replaces Yacare (datum code 6309) in Uruguay. Uruguay documentation clearly states use of WGS 84 reference ellipsoid.',
        ],
        'urn:ogc:def:datum:EPSG::1069' => [
            'name' => 'SIRGAS_ES2007.8',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'El Salvador',
            'help' => 'ITRF2005 at epoch 2007.85.  Densification of SIRGAS-CON network in El Salvador, consisting of 38 monumented stations.
SIRGAS-ES2007.8 is the national SIRGAS densification.',
        ],
        'urn:ogc:def:datum:EPSG::1070' => [
            'name' => 'Ocotepeque 1935',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Central America - Guatemala to Costa Rica',
            'help' => 'Fundamental point: Base Norte. Latitude: 14°26\'20.168"N, longitude: 89°11\'33.964"W.
Replaced in Costa Rica by Costa Rica 2005 (CR05) from March 2007 and replaced in El Salvador by SIRGAS_ES2007 from August 2007.',
        ],
        'urn:ogc:def:datum:EPSG::1071' => [
            'name' => 'Sibun Gorge 1922',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7007',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Belize - onshore',
            'help' => 'Latitude: 17º03\'40.471"N, longitude: 88º37\'54.687"W.
',
        ],
        'urn:ogc:def:datum:EPSG::1072' => [
            'name' => 'Panama-Colon 1911',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Panama - onshore',
            'help' => 'Fundamental point: Balboa Hill. Latitude: 09°04\'57.637"N, longtitude: 79°43\'50.313"W.
Reports of the existence of an Ancon datum are probably erroneous, considering that the origin of the Panamá-Colón Datum of 1911 is at Balboa Hill and the access road up the hill is from the town of Ancon, Canal Zone.',
        ],
        'urn:ogc:def:datum:EPSG::1073' => [
            'name' => 'Reseau Geodesique des Antilles Francaises 2009',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Caribbean - French Antilles',
            'help' => 'ITRF2005 at epoch 2009.0
Replaces RRAF91 in Martinique and Guadeloupe.',
        ],
        'urn:ogc:def:datum:EPSG::1074' => [
            'name' => 'Corrego Alegre 1961',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Brazil - Corrego Alegre 1961',
            'help' => 'Fundamental point: Corrego Alegre. Latitude: 19°50\'14.91"S, longitude: 48°57\'41.98"W (of Greenwich).
Replaced by Corrego Alegre 1970-72 (datum code 6225). NIMA gives coordinates of origin as latitude: 19°50\'15.14"S, longitude: 48°57\'42.75"W.',
        ],
        'urn:ogc:def:datum:EPSG::1075' => [
            'name' => 'South American Datum 1969(96)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7050',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Brazil',
            'help' => 'Fundamental point: Chua. Geodetic latitude: 19°45\'41.6527"S; geodetic longitude: 48°06\'04.0639"W (of Greenwich). (Astronomic coordinates: Latitude 19°45\'41.34"S +/- 0.05", longitude 48°06\'07.80"W +/- 0.08").
SAD69 uses GRS 1967 ellipsoid but with 1/f to exactly 2 decimal places. Replaces original 1969 adjustment (datum code 6618) in Brazil.',
        ],
        'urn:ogc:def:datum:EPSG::1076' => [
            'name' => 'Papua New Guinea Geodetic Datum 1994',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Papua New Guinea',
            'help' => 'ITRF92 at epoch 1994.0.
Adopted 1996. Coincident with WGS 84 in 1994 but rapidly divergent due to significant tectonic motion in PNG.',
        ],
        'urn:ogc:def:datum:EPSG::1077' => [
            'name' => 'Ukraine 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Ukraine',
            'help' => 'Orientation and scale constrained to be same as ITRF2000 at epoch 2005.0. Position is minimised deviation between reference ellipsoid and quasigeoid in territory of Ukraine.
',
        ],
        'urn:ogc:def:datum:EPSG::1078' => [
            'name' => 'Fehmarnbelt Datum 2010',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Fehmarnbelt outer',
            'help' => 'ITRF2005 at epoch 2010.14.
Defined through coordinates of four permanant GNSS stations.',
        ],
        'urn:ogc:def:datum:EPSG::1079' => [
            'name' => 'Fehmarnbelt Vertical Reference 2010',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Fehmarnbelt inner',
            'help' => 'Realised by precise levelling between tide gauges at Marienleuchte (Germany), Rodbyhavn (Denmark) and four Fehmarnbelt project GNSS stations.
',
        ],
        'urn:ogc:def:datum:EPSG::1080' => [
            'name' => 'Lowest Astronomical Tide',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The lowest tide level which can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions.',
        ],
        'urn:ogc:def:datum:EPSG::1081' => [
            'name' => 'Deutsche Bahn Reference System',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - onshore',
            'help' => 'Defined by transformation from ETRS89 (transformation code 5826) to be an average of DHDN realizations across all German states.
In DB_REF2016 only the vertical CRS component is updated, the geodetic CRS component of DB_REF is unchanged.',
        ],
        'urn:ogc:def:datum:EPSG::1082' => [
            'name' => 'Highest Astronomical Tide',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The highest tide level which can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions.',
        ],
        'urn:ogc:def:datum:EPSG::1083' => [
            'name' => 'Lower Low Water Large Tide',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average of the lowest low waters, one from each of 19 years of observations.',
        ],
        'urn:ogc:def:datum:EPSG::1084' => [
            'name' => 'Higher High Water Large Tide',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average of the highest high waters, one from each of 19 years of observations.',
        ],
        'urn:ogc:def:datum:EPSG::1085' => [
            'name' => 'Indian Spring Low Water',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The level below MSL equal to the sum of the amplitudes of the harmonic constituents M2, S2, K1 and O1. It approximates mean lower low water spring tides (MLLWS).',
        ],
        'urn:ogc:def:datum:EPSG::1086' => [
            'name' => 'Mean Lower Low Water Spring Tides',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average height of the lower low water spring tides.',
        ],
        'urn:ogc:def:datum:EPSG::1087' => [
            'name' => 'Mean Low Water Spring Tides',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average height of the low waters of spring tides.',
        ],
        'urn:ogc:def:datum:EPSG::1088' => [
            'name' => 'Mean High Water Spring Tides',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average height of the high waters of spring tides.',
        ],
        'urn:ogc:def:datum:EPSG::1089' => [
            'name' => 'Mean Lower Low Water',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average height of the lower low waters over a 19-year period.',
        ],
        'urn:ogc:def:datum:EPSG::1090' => [
            'name' => 'Mean Higher High Water',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average height of the higher high waters over a 19-year period.',
        ],
        'urn:ogc:def:datum:EPSG::1091' => [
            'name' => 'Mean Low Water',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average height of all low waters over a 19-year period.',
        ],
        'urn:ogc:def:datum:EPSG::1092' => [
            'name' => 'Mean High Water',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average height of the high waters over a 19-year period.',
        ],
        'urn:ogc:def:datum:EPSG::1093' => [
            'name' => 'Low Water',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The lowest level reached by the water surface in one tidal cycle. When used in inland (non-tidal) waters it is generally defined as a level which the daily mean water level would fall below less than 5% of the time. On a river it is a sloping surface.',
        ],
        'urn:ogc:def:datum:EPSG::1094' => [
            'name' => 'High Water',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The highest water level reached at a place in one tidal cycle. When used on inland (non-tidal) waters it is generally defined as a level which the daily mean water level exceeds less than 5% of the time.',
        ],
        'urn:ogc:def:datum:EPSG::1095' => [
            'name' => 'Tonga Geodetic Datum 2005',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Tonga',
            'help' => 'Based on ITRF2000 at epoch 2005.0
',
        ],
        'urn:ogc:def:datum:EPSG::1096' => [
            'name' => 'Norway Normal Null 2000',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => 2000.0,
            'anchor_epoch' => null,
            'extent_name' => 'Norway - onshore',
            'help' => 'Adjustment is referenced to mean high tide at Amsterdams Peil in 1684. To account for land level movements caused by isostatic rebound, heights are reduced to epoch 2000.0 using values computed from the NKG2005LU uplift model.
Replaces NN54. Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::1097' => [
            'name' => 'Grand Cayman Vertical Datum 1954',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cayman Islands - Grand Cayman',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::1098' => [
            'name' => 'Little Cayman Vertical Datum 1961',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cayman Islands - Little Cayman',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::1099' => [
            'name' => 'Cayman Brac Vertical Datum 1961',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cayman Islands - Cayman Brac',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::1100' => [
            'name' => 'Cayman Islands Geodetic Datum 2011',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cayman Islands',
            'help' => 'ITRF2005 at epoch 2011.0
Replaces GCGD59 (datum code 6723) and SIGD61 (datum code 6726).',
        ],
        'urn:ogc:def:datum:EPSG::1101' => [
            'name' => 'Cais da Pontinha',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Madeira and Desertas islands onshore',
            'help' => 'Mean Sea Level during 1913 at Cais da Pontinha, Funchal.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1102' => [
            'name' => 'Cais da Vila',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Porto Santo island onshore',
            'help' => 'Mean Sea Level during 1936 at Cais da Vila, Porto Santo.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1103' => [
            'name' => 'Cais das Velas',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores C - S Jorge onshore',
            'help' => 'Mean Sea Level during 1937 at Cais das Velas.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1104' => [
            'name' => 'Horta',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores C - Faial onshore',
            'help' => 'Mean Sea Level during 1935 at Horta.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1105' => [
            'name' => 'Cais da Madalena',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores C - Pico onshore',
            'help' => 'Mean Sea Level during 1937 at Cais da Madalena.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1106' => [
            'name' => 'Santa Cruz da Graciosa',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores C - Graciosa onshore',
            'help' => 'Mean Sea Level during 1938 at Santa Cruz da Graciosa.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1107' => [
            'name' => 'Cais da Figueirinha',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores C - Terceira onshore',
            'help' => 'Mean Sea Level during 1951 at Cais da Figueirinha, Angra do Heroísmo.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1108' => [
            'name' => 'Santa Cruz das Flores',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores W - onshore',
            'help' => 'Mean Sea Level during 1965 at Santa Cruz das Flores.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1109' => [
            'name' => 'Cais da Vila do Porto',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores E onshore - Santa Maria and Formigas',
            'help' => 'Mean Sea Level during 1965 at Cais da Vila, Porto.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1110' => [
            'name' => 'Ponta Delgada',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores E - S Miguel onshore',
            'help' => 'Mean Sea Level during 1991 at Ponta Delgada.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1111' => [
            'name' => 'Nepal 1981',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7015',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Nepal',
            'help' => 'Fundamental point: Station 12/157 Nagarkot. Latitude: 27°41\'31.04"N, longitude: 85°31\'20.23"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::1112' => [
            'name' => 'Cyprus Geodetic Reference System 1993',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cyprus - onshore',
            'help' => 'Station Chionistra (Mount Troodos). Network scale and orientation determined by connection of six stations to ITRF91 in Europe at epoch 1993.1.
Survey plans and maps produced by DLS after 1993.',
        ],
        'urn:ogc:def:datum:EPSG::1113' => [
            'name' => 'Reseau Geodesique des Terres Australes et Antarctiques Francaises 2007',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Southern and Antarctic Territories',
            'help' => 'ITRF2005 at epoch 2007.274
Replaces IGN 1963-64 on Amsterdam, Saint-Paul 1969 on St Paul, IGN64 on Crozet, MHM 1954 on Europa, IGN 1962 on Kerguelen, and Petrels 1972 and Perroud 1950 in Adelie Land.',
        ],
        'urn:ogc:def:datum:EPSG::1114' => [
            'name' => 'Israeli Geodetic Datum 2005',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Israel',
            'help' => 'Defined by coordinates of 13 Active Positioning Network (APN) stations in ITRF2000 at epoch 2004.75. A further five APN stations were added in 2006.
Replaces Israel 1993 (datum code 6141). Replaced by IGD05/12 (datum code 1115).',
        ],
        'urn:ogc:def:datum:EPSG::1115' => [
            'name' => 'Israeli Geodetic Datum 2005(2012)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Israel',
            'help' => 'Datum updated in 2012 with four APN stations removed from definition. Coordinate epoch remains ITRF2000 at epoch 2004.75.
Replaces IGD05 (datum code 1114).',
        ],
        'urn:ogc:def:datum:EPSG::1116' => [
            'name' => 'NAD83 (National Spatial Reference System 2011)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - CONUS and Alaska; PRVI',
            'help' => 'Coordinates of a nationwide adjustment of 79,546 NGS "passive" control stations in CONUS and Alaska, constrained to 1,171 current CORS station coordinates at epoch 2010.0.
Replaces NAD83(NSRS2007). Transformaton code 7807 from ITRF2008 is understood to underlay the CORS station coordinates.',
        ],
        'urn:ogc:def:datum:EPSG::1117' => [
            'name' => 'NAD83 (National Spatial Reference System PA11)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Pacific - US interests Pacific plate',
            'help' => 'Coordinates of a nationwide adjustment including 345 NGS "passive" control stations constrained to 24 current Pacific CORS station coordinates at epoch 2010.0.
Replaces NAD83(HARN) and NAD83(FBN) in Hawaii and American Samoa. ITRF2008 is understood to underlay the latest CORS station coordinates.',
        ],
        'urn:ogc:def:datum:EPSG::1118' => [
            'name' => 'NAD83 (National Spatial Reference System MA11)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Pacific - US interests Mariana plate',
            'help' => 'Coordinates of a nationwide adjustment including 171 NGS "passive" control stations constrained to 24 current Pacific CORS station coordinates at epoch 2010.0.
Replaces NAD83(HARN) (GGN93) and NAD83(FBN) in Guam. ITRF2008 is understood to underlay the latest CORS station coordinates.',
        ],
        'urn:ogc:def:datum:EPSG::1119' => [
            'name' => 'Northern Marianas Vertical Datum of 2003',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Northern Mariana Islands - Rota, Saipan and Tinian',
            'help' => 'Mean sea level at Tanapag harbor, Saipan. Benchmark 1633227 TIDAL UH-2C = 1.657m relative to National Tidal Datum Epoch 1983-2001. Transferred to Rota (East Harbor, BM TIDAL 3 = 1.482m) and Tinian (Harbor BM TIDAL 1 = 2.361m).
Replaces all earlier vertical datums on these islands.',
        ],
        'urn:ogc:def:datum:EPSG::1120' => [
            'name' => 'Mexico ITRF2008',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mexico',
            'help' => 'ITRF2008 at epoch 2010.00.
Realised by a frame of 15 active GPS stations observed and adjusted in the ITRF2008. Includes ties to tide gauges. Replaces Mexico ITRF92 (datum code 1042).',
        ],
        'urn:ogc:def:datum:EPSG::1121' => [
            'name' => 'Tutuila Vertical Datum of 1962',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'American Samoa - Tutuila island',
            'help' => 'Mean sea level at Pago Pago harbor, Tutuila, over 10 years 1949-1955 and 1957-1959. Benchmark NO 2 1948 = 7.67ftUS.
Replaced by American Samoa Vertical Datum of 2002 (datum code 1125).',
        ],
        'urn:ogc:def:datum:EPSG::1122' => [
            'name' => 'Guam Vertical Datum of 1963',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guam - onshore',
            'help' => 'Mean sea level at Apra harbor, Guam, 1949-1962. Benchmark NO 5 1949 = 0.599m.
Replaced by Guam vertical datum of 2004 (datum code 1126).',
        ],
        'urn:ogc:def:datum:EPSG::1123' => [
            'name' => 'Puerto Rico Vertical Datum of 2002',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Puerto Rico - onshore',
            'help' => 'Mean sea level at San Juan. Benchmark 9756371 A TIDAL = 1.334m relative to National Tidal Datum Epoch 1960-1978.
Replaces all earlier vertical datums for Puerto Rico.',
        ],
        'urn:ogc:def:datum:EPSG::1124' => [
            'name' => 'Virgin Islands Vertical Datum of 2009',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Virgin Islands, US - onshore',
            'help' => 'Mean sea level for National Tidal Datum Epoch 1983–2001 at (i) Lime Tree Bay, St. Croix (BM 9751401 M = 3.111m) , (ii) Lameshur Bay, St. John (BM 9751381 TIDAL A = 1.077m) , and (iii) Charlotte Amalie, St. Thomas (BM 9751639 F = 1.552m).
Replaces all earlier vertical datums on these islands.',
        ],
        'urn:ogc:def:datum:EPSG::1125' => [
            'name' => 'American Samoa Vertical Datum of 2002',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'American Samoa - Tutuila island',
            'help' => 'Mean sea level at Pago Pago harbor, Tutuila. Benchmark 1770000 S TIDAL = 1.364m relative to National Tidal Datum Epoch 1983-2001.
Replaces Tutuila vertical datum of 1962 (datum code 1121). Replaced by Pago Pago local tidal datum (datum code 1302) in March 2020 after ASVD02 benchmarks destroyed by earthquake activity.',
        ],
        'urn:ogc:def:datum:EPSG::1126' => [
            'name' => 'Guam Vertical Datum of 2004',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guam - onshore',
            'help' => 'Mean sea level at Apra harbor, Guam. Benchmark 1630000 TIDAL 4 = 2.170m relative to US National Tidal Datum Epoch 1983-2001. MSL is 0.419m above MLLW and the BM is 2.589m above MLLW.
Replaces Guam Vertical Datum of 1963 (datum code 1122).',
        ],
        'urn:ogc:def:datum:EPSG::1127' => [
            'name' => 'Canadian Geodetic Vertical Datum of 2013 (CGG2013)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Canada',
            'help' => 'Defined by the equipotential surface W0 = 62,636,856.0 m^2s^-2, which by convention represents the coastal mean sea level for North America, realized through the Canadian gravimetric geoid (CGG) 2013 at epoch 2010.0.
Replaces CGVD28 from November 2013. Replaced by CGVD2013(CGG2013a) epoch 2010 from December 2015, supplemented from February 2021 by snapshots of CGVD2013(CGG2013a) at epochs 1997.0 and 2002.0 (aligned with NAD83(CSRS) realization epochs).',
        ],
        'urn:ogc:def:datum:EPSG::1128' => [
            'name' => 'Japanese Geodetic Datum 2011',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Japan',
            'help' => 'ITRF94 at epoch 1997.0 except for northern Honshu area impacted by 2011 Tohoku earthquake which is ITRF2008 at epoch 2011.395. Fundamental point: Tokyo-Taisho, latitude: 35°39\'29.1572"N, longitude: 139°44\'28.8869"E (of Greenwich).
Instigated under amendment to the Japanese Surveying Law with effect from 21st October 2011. Replaces JGD2000 (datum code 6612).',
        ],
        'urn:ogc:def:datum:EPSG::1129' => [
            'name' => 'Japanese Standard Levelling Datum 1972',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Japan - onshore - Hokkaido',
            'help' => 'Mean sea level Oshoro 1963-72.
Normal-orthometric heights. Replaced by JGD2000 (vertical) (datum code 1130) with effect from April 2002.',
        ],
        'urn:ogc:def:datum:EPSG::1130' => [
            'name' => 'Japanese Geodetic Datum 2000 (vertical)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Japan - onshore mainland',
            'help' => '24.4140 metres above mean sea level Tokyo Bay.
Orthometric heights. Replaces JSLD69 and JSLD72 with effect from April 2002. Replaced by JGD2011 (vertical) (datum code 1131) with effect from 21st October 2011.',
        ],
        'urn:ogc:def:datum:EPSG::1131' => [
            'name' => 'Japanese Geodetic Datum 2011 (vertical)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Japan - onshore mainland',
            'help' => '24.3900 metres above mean sea level Tokyo Bay.
Orthometric heights. Replaces JGD2000 (vertical) (datum code 1130) with effect from 21st October 2011.',
        ],
        'urn:ogc:def:datum:EPSG::1132' => [
            'name' => 'Rete Dinamica Nazionale 2008',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Italy - including San Marino and Vatican',
            'help' => 'Italian densification of ETRS89 realised through network of 99 permanent reference stations in [email protected].
Adopted as official Italian reference datum 10/11/2011. Replaces IGM95 (datum code 6670).',
        ],
        'urn:ogc:def:datum:EPSG::1133' => [
            'name' => 'NAD83 (Continuously Operating Reference Station 1996)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - CONUS and Alaska; PRVI',
            'help' => 'Defined by time-dependent transformations from ITRF (see CT codes 6864-6866). The ITRF realization used has been changed periodically; ITRF96 in years 1997 through 1999, ITRF97 in 2000 and 2001 and ITRF2000 from 2002.
Replaced by NAD83(2011) from 2011-09-06.',
        ],
        'urn:ogc:def:datum:EPSG::1135' => [
            'name' => 'Aden 1925',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Yemen - South Yemen - mainland',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::1136' => [
            'name' => 'Bioko',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Equatorial Guinea - Bioko',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::1137' => [
            'name' => 'Bekaa Valley 1920',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Lebanon - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::1138' => [
            'name' => 'South East Island 1943',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Seychelles - Seychelles Bank',
            'help' => 'Fundamental point: Challenger Astro near Port Victoria lighthouse. Latitude: 4°40\'39.460"S, longitude: 55°32\'00.166"E (of Greenwich).
Network readjusted in 1958-59 and extended to Bird and Denis islands in 1975.',
        ],
        'urn:ogc:def:datum:EPSG::1139' => [
            'name' => 'Gambia',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Gambia - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::1140' => [
            'name' => 'Singapore Height Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Singapore',
            'help' => 'Mean sea level determined at Victoria Dock tide gauge 1935-1937.
Orthometric heights. Network readjusted in 2009.',
        ],
        'urn:ogc:def:datum:EPSG::1141' => [
            'name' => 'IGS08',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2005.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived from ITRF2008 at epoch 2005.00 through a subset of 232 stable IGS station coordinates. Preserves the ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
Used for IGS products from GPS week 1632 through GPS week 1708 (2011-04-17 through 2012-10-06). Replaces IGS05. Replaced by IGb08. For all practical purposes coincident with ITRF2008.',
        ],
        'urn:ogc:def:datum:EPSG::1142' => [
            'name' => 'IG05 Intermediate Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East - Israel and Palestine Territory onshore',
            'help' => 'Defined by transformation from IGD05 at epoch 2004.75.
',
        ],
        'urn:ogc:def:datum:EPSG::1144' => [
            'name' => 'IG05/12 Intermediate Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East - Israel and Palestine Territory onshore',
            'help' => 'Defined by transformation from IGD05/12 at epoch 2012.00.
',
        ],
        'urn:ogc:def:datum:EPSG::1146' => [
            'name' => 'Ras Ghumays',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UAE - Abu Dhabi - onshore',
            'help' => 'Mean Sea Level at Ras Ghumays 1978 and 1979.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1147' => [
            'name' => 'Oman National Geodetic Datum 2014',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Oman',
            'help' => '20 stations of the Oman primary network tied to ITRF2008 at epoch 2013.15.
Replaces WGS 84 (G873). Replaced by ONGD17.',
        ],
        'urn:ogc:def:datum:EPSG::1148' => [
            'name' => 'Famagusta 1960',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cyprus - onshore',
            'help' => 'Mean sea level at Famagusta Harbour.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1149' => [
            'name' => 'PNG08',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Papua New Guinea - 0°N to 12°S and 140°E to 158°E',
            'help' => 'Mean sea level at 8 tide gauges around PNG, defined through application of PNG08 geoid model (transformation code 7655) to PNG94 (CRS code 5545).
',
        ],
        'urn:ogc:def:datum:EPSG::1150' => [
            'name' => 'Kumul 34',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Papua New Guinea - PFTB',
            'help' => 'Kumul Platform Station 34. Propagated through bilinear interpolation of EGM96 geoid model (transformation code 10084) reduced to Kumul 34 by offset of -0.87m.
',
        ],
        'urn:ogc:def:datum:EPSG::1151' => [
            'name' => 'Kiunga',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Papua New Guinea - onshore south of 5°S and west of 144°E',
            'help' => 'PSM 9465 at Kiunga Airport. Propagated through bilinear interpolation of EGM2008 geoid model (transformation code 3858) reduced to PSM 9465 by offset of -3.0m.
',
        ],
        'urn:ogc:def:datum:EPSG::1152' => [
            'name' => 'World Geodetic System 1984 (G730)',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1024,
            'frame_reference_epoch' => 1994.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of 10 GPS tracking stations adjusted to a subset of ITRF92 stations at epoch 1994.0. The reference epoch for ITRF92 is 1988.0; the ITRF92 station coordinates were transformed to 1994.0 using the NNR-NUVEL1 plate motion model.
Replaces the original Transit-derived World Geodetic System 1984 from 1994-06-29. Replaced by World Geodetic System 1984 (G873) from 1997-01-29.',
        ],
        'urn:ogc:def:datum:EPSG::1153' => [
            'name' => 'World Geodetic System 1984 (G873)',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1024,
            'frame_reference_epoch' => 1997.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of 13 GPS tracking stations adjusted to a subset of ITRF94 stations at epoch 1997.0. The reference epoch for the adjustment was 1994.0 and the coordinates were propagated to 1997.0 using the NNR-NUVEL-1A plate motion model.
Replaces World Geodetic System 1984 (G730) from 1997-01-29. Replaced by World Geodetic System 1984 (G1150) from 2002-01-20.',
        ],
        'urn:ogc:def:datum:EPSG::1154' => [
            'name' => 'World Geodetic System 1984 (G1150)',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1024,
            'frame_reference_epoch' => 2001.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of 17 GPS tracking stations adjusted to a subset of 49 IGS stations. Observations made in February 2001. The reference epoch for ITRF2000 is 1997.0; station coordinates were transformed to 2001.0 using IERS station velocities.
Replaces World Geodetic System 1984 (G873) from 2002-01-20. Replaced by World Geodetic System 1984 (G1674) from 2012-02-08.',
        ],
        'urn:ogc:def:datum:EPSG::1155' => [
            'name' => 'World Geodetic System 1984 (G1674)',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1024,
            'frame_reference_epoch' => 2005.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of 15 GPS tracking stations adjusted to a subset of IGS stations at epoch 2005.0. The IGS station coordinates are considered to be equivalent to ITRF2008.
Replaces World Geodetic System 1984 (G1150) from 2012-02-08. Replaced by World Geodetic System 1984 (G1762) from 2013-10-16.',
        ],
        'urn:ogc:def:datum:EPSG::1156' => [
            'name' => 'World Geodetic System 1984 (G1762)',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1024,
            'frame_reference_epoch' => 2005.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of 19 GPS tracking stations adjusted to a subset of IGb08 stations at epoch 2005.0 using observations made in May 2013. The IGb08 coordinates are considered to be equivalent to ITRF2008.
Replaces WGS 84 (G1674) from 2013-10-16. Frame was redesignated WGS 84 (G1762\') after coordinates of 7 NGA tracking stations were changed following station moves and antenna updates 2014-08 to 2015-06. Replaced by WGS 84 (G2139) from 2021-01-03.',
        ],
        'urn:ogc:def:datum:EPSG::1157' => [
            'name' => 'Parametry Zemli 1990.02',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7054',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2002.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of 33 stations of the satellite geodetic network (SGN) in Russia and Antarctica adjusted to a subset of 14 IGS stations in Russia at epoch 2002.0. The IGS station coordinates are considered to be equivalent to ITRF2000.
Replaces PZ-90 from 2007-09-20. Replaced by PZ-90.11 from 2014-01-15.',
        ],
        'urn:ogc:def:datum:EPSG::1158' => [
            'name' => 'Parametry Zemli 1990.11',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7054',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2010.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of 33 stations of the satellite geodetic network (SGN) in Russia and Antarctica adjusted to a subset of 14 IGS stations in Russia at epoch 2010.0. The IGS station coordinates are considered to be equivalent to ITRF2008.
Replaces PZ-90.02 from 2014-01-15.',
        ],
        'urn:ogc:def:datum:EPSG::1159' => [
            'name' => 'Geodezicheskaya Sistema Koordinat 2011',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::1025',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Russia',
            'help' => 'Coordinates of the Russian fundamental astronomic-geodetic network (about 50 stations) at epoch 2011.0
',
        ],
        'urn:ogc:def:datum:EPSG::1160' => [
            'name' => 'Kyrgyzstan Geodetic Datum 2006',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Kyrgyzstan',
            'help' => '6 stations of the Kyrgyzstan zero-order network tied to ITRF2005 at epoch 2006.70.
The accuracy in the connection to ITRF2005 is estimated to be 5 mm in horizontal and 10-20 mm in height (95% confidence).',
        ],
        'urn:ogc:def:datum:EPSG::1161' => [
            'name' => 'Deutsches Haupthoehennetz 1912',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - onshore',
            'help' => 'Height of reference point "Normalnullpunkt" at Berlin Observatory defined as 37.000m above MSL in 1879 (transferred to benchmarks near Hoppegarten in Müncheberg in 1912). Datum at Normaal Amsterdams Peil (NAP) is mean high tide in 1684.
Uses Normal-orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1162' => [
            'name' => 'Latvian Height System 2000',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Latvia - onshore',
            'help' => 'Latvian realisation of EVRF2007. Observed from 2000-2010 and reduced to epoch 2000.5 using empirical land uplift model of Latvia. EVRF2007 heights of 16 points around Latvia held fixed.
Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::1164' => [
            'name' => 'Ordnance Datum Newlyn (Offshore)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1026,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - offshore 49°45\'N to 61°N, 9°W to 2°E',
            'help' => 'Defined by OSGM geoid model.
Extension of Ordnance Datum Newlyn offshore through geoid model. Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1165' => [
            'name' => 'International Terrestrial Reference Frame 2014',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2010.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre. Origin = ILRS SLR long-term solution at epoch 2010.0. Zero scale and scale rate between ITRF2014 and the average of VLBI and SLR scales/rates. Orientation = ITRF2008@ 2010.0 with zero rotation rates between the ITRF2014 and ITRF2008.
Realization of the IERS Terrestrial Reference System (ITRS). Replaces ITRF2008 (datum code 1061) from January 2016. Replaced by ITRF2020 (datum code 1322) from April 2022.',
        ],
        'urn:ogc:def:datum:EPSG::1166' => [
            'name' => 'World Geodetic System 1984 (Transit)',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1024,
            'frame_reference_epoch' => 1984.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of 5 GPS tracking stations in the Transit doppler positioning NSWC 9Z-2 reference frame transformed to be aligned to the BIH Conventional Terrestrial Reference Frame (BTS) at epoch 1984.0.
The NSWC 9Z-2 origin shifted by -4.5 m along the Z-axis, scale changed by -0.6 x 10E-6 and the reference meridian rotated westward by 0.814" to be aligned to the BTS at epoch 1984.0. Replaced by World Geodetic System 1984 (G730) from 1994-06-29.',
        ],
        'urn:ogc:def:datum:EPSG::1167' => [
            'name' => 'Bulgaria Geodetic System 2005',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bulgaria',
            'help' => 'Densification of ETRS89 realised through network of 112 permanent GNSS reference stations in [email protected].
Adopted as official Bulgarian reference datum through decree 153 of 2010-07-29.',
        ],
        'urn:ogc:def:datum:EPSG::1168' => [
            'name' => 'Geocentric Datum of Australia 2020',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Australia - GDA',
            'help' => 'ITRF2014 at epoch 2020.0.
',
        ],
        'urn:ogc:def:datum:EPSG::1169' => [
            'name' => 'New Zealand Vertical Datum 2016',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand',
            'help' => 'New Zealand quasigeoid 2016 which is defined by the application of the NZ geoid 2016 grid to NZGD2000 ellipsoidal heights. See transformation code 7840.
',
        ],
        'urn:ogc:def:datum:EPSG::1170' => [
            'name' => 'Deutsches Haupthoehennetz 2016',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany',
            'help' => '2006-2012 levelling network adjusted to 72 points of the DHHN92. Datum at Normaal Amsterdams Peil (NAP) is mean high tide in 1684. Extension offshore defined by the GCG2016 quasi-geoid model (CT code 9925).
Uses Normal heights in the mean tidal system.',
        ],
        'urn:ogc:def:datum:EPSG::1171' => [
            'name' => 'Port Moresby 1996',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Papua New Guinea - onshore - Central province and Gulf province east of 144°E',
            'help' => 'BM198 (adjacent to the Port Moresby tide gauge) height of 3.02 above MSL as determined by CSIRO in 1990. Propagated through bilinear interpolation of EGM96 geoid model (transformation code 10084) reduced by offset of -1.58m.
Offset has been determined by static GNSS estimation of ellipsoid height of BM198.',
        ],
        'urn:ogc:def:datum:EPSG::1172' => [
            'name' => 'Port Moresby 2008',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Papua New Guinea - onshore - Central province and Gulf province east of 144°E',
            'help' => 'BM198 (adjacent to the Port Moresby tide gauge) height of 3.02 above MSL as determined by CSIRO in 1990. Propagated through bilinear interpolation of EGM2008 geoid model (transformation code 3858 or 3859) reduced by offset of -0.93m.
Offset has been determined by static GNSS estimation of ellipsoid height of BM198 validated to a precision of 10 cm by short period tidal observations at Kerema wharf in 2010.',
        ],
        'urn:ogc:def:datum:EPSG::1173' => [
            'name' => 'St. Helena Tritan',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Helena - St Helena Island',
            'help' => 'WGS 84(G1150) at epoch 2011.773. WGS 84 coordinates (15°56\'33.1217"S, 5°40\'02.4436"W, 453.288m ellipsoid height) of Longwood IGS CORS station STHL on 9th October 2011
',
        ],
        'urn:ogc:def:datum:EPSG::1174' => [
            'name' => 'St. Helena Geodetic Datum 2015',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Helena - St Helena Island',
            'help' => 'ITRF2008 at epoch 2015.0. ITRF2008 coordinates (15°56\'33.1198"S, 5°40\'02.4412"W, 453.183m ellipsoid height) of Longwood IGS CORS station STHL on 1st January 2015.
Developed by Richard Stanaway, Quickclose Pty Ltd, superseding Astro DOS 71 from 1st January 2016.',
        ],
        'urn:ogc:def:datum:EPSG::1175' => [
            'name' => 'Jamestown 1971',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Helena - St Helena Island',
            'help' => 'MSL at Jamestown 1971 defined through elevation of triangulation station Astro DOS 71/4 Ladder Hill Fort being 267.858 metres above MSL.
',
        ],
        'urn:ogc:def:datum:EPSG::1176' => [
            'name' => 'St. Helena Tritan Vertical Datum 2011',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Helena - St Helena Island',
            'help' => 'MSL defined by Longwood IGS station STHL reference level of 436.215m.
Defined by offset of -17.073m applied to St. Helena Tritan ellipsiodal height (CRS code 7880).',
        ],
        'urn:ogc:def:datum:EPSG::1177' => [
            'name' => 'St. Helena Vertical Datum 2015',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Helena - St Helena Island',
            'help' => 'Longwood IGS station STHL reference level of 436.312m.
Defined by SHGEOID15 geoid model (transformation code 7891) applied to SHGD2015 (CRS code 7885).',
        ],
        'urn:ogc:def:datum:EPSG::1178' => [
            'name' => 'European Terrestrial Reference Frame 1989',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF89 at epoch 1989.0. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the AM02 geophysical model.
Defined by transformation from ITRF89 (CT code 7932). Replaced by ETRF90 (datum code 1179).',
        ],
        'urn:ogc:def:datum:EPSG::1179' => [
            'name' => 'European Terrestrial Reference Frame 1990',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF90 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3 translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the AM02 geophysical model.
Defined by transformation from ITRF90 (CT code 7933). Replaces ETRF89 (datum code 1178). Replaced by ETRF91 (datum code 1180).',
        ],
        'urn:ogc:def:datum:EPSG::1180' => [
            'name' => 'European Terrestrial Reference Frame 1991',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF91 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3 translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the AM02 geophysical model.
Defined by transformation from ITRF91 (CT code 7934). Replaces ETRF90 (datum code 1179). Replaced by ETRF92 (datum code 1181).',
        ],
        'urn:ogc:def:datum:EPSG::1181' => [
            'name' => 'European Terrestrial Reference Frame 1992',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF92 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3 translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the NNR-NUVEL-1 geophysical model.
Defined by transformation from ITRF92 (CT code 7935). Replaces ETRF91 (datum code 1180). Replaced by ETRF93 (datum code 1182).',
        ],
        'urn:ogc:def:datum:EPSG::1182' => [
            'name' => 'European Terrestrial Reference Frame 1993',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF93 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3 translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the ITRF93 velocity field.
Defined by transformation from ITRF93 (CT code 7936). Replaces ETRF92 (datum code 1181). Replaced by ETRF94 (datum code 1183).',
        ],
        'urn:ogc:def:datum:EPSG::1183' => [
            'name' => 'European Terrestrial Reference Frame 1994',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF94 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3 translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the NNR-NUVEL-1A geophysical model.
Defined by transformation from ITRF94 (CT code 7937). Replaces ETRF93 (datum code 1182). Replaced by ETRF96 (datum code 1184).',
        ],
        'urn:ogc:def:datum:EPSG::1184' => [
            'name' => 'European Terrestrial Reference Frame 1996',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF96 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3 translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the NNR-NUVEL-1A geophysical model.
Defined by transformation from ITRF96 (CT code 7938). Replaces ETRF94 (datum code 1183). Replaced by ETRF97 (datum code 1185).',
        ],
        'urn:ogc:def:datum:EPSG::1185' => [
            'name' => 'European Terrestrial Reference Frame 1997',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF97 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3 translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the NNR-NUVEL-1A geophysical model.
Defined by transformation from ITRF97 (CT code 7939). Replaces ETRF96 (datum code 1184). Replaced by ETRF2000 (datum code 1186).',
        ],
        'urn:ogc:def:datum:EPSG::1186' => [
            'name' => 'European Terrestrial Reference Frame 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF2000 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3 translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the ITRF2000 velocity field.
Defined by transformation from ITRF2000 (CT 7940). Replaces ETRF97. On the publication of ETRF2005 the EUREF TWG recommended that ETRF2000 be the realization of ETRS89. ETRF2014 (code 1206) is technically superior to all earlier realizations of ETRS89.',
        ],
        'urn:ogc:def:datum:EPSG::1187' => [
            'name' => 'Islands Net 2016',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iceland',
            'help' => 'ITRF2014 at epoch 2016.5.
Replaces ISN2004 from September 2017.',
        ],
        'urn:ogc:def:datum:EPSG::1188' => [
            'name' => 'Gusterberg (Ferro)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::1026',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8909',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Upper Austria, Salzburg and Bohemia',
            'help' => 'Fundamental point: Gusterberg. Latitude: 48°02\'18.47"N, longitude: 31°48\'15.05"E (of Ferro).
',
        ],
        'urn:ogc:def:datum:EPSG::1189' => [
            'name' => 'St. Stephen (Ferro)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::1026',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8909',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Lower Austria and Moravia',
            'help' => 'Fundamental point: St. Stephen\'s cathedral, Vienna. Latitude: 48°12\'31.54"N, longitude: 34°02\'27.32"E (of Ferro).
',
        ],
        'urn:ogc:def:datum:EPSG::1190' => [
            'name' => 'Landshaedarkerfi Islands 2004',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iceland - onshore',
            'help' => 'Adjustment is referenced to mean sea level at Reykjavík epoch 2004.6.
',
        ],
        'urn:ogc:def:datum:EPSG::1191' => [
            'name' => 'IGS14',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2010.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived from ITRF2014 at epoch 2010.00 through a subset of 252 stable IGS station coordinates. Preserves the ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
Used for IGS products from GPS week 1934 (2017-01-29) through GPS week 2105 (2020-05-16). Replaces IGb08, replaced by IGb14. For all practical purposes coincident with ITRF2014.',
        ],
        'urn:ogc:def:datum:EPSG::1192' => [
            'name' => 'North American Datum of 1983 (CSRS96)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Canada',
            'help' => 'Defined at epoch 1988.0 by a transformation from ITRF92, the definition superseded by a transformation from ITRF93 and then by a transformation from ITRF94. (See transformation codes 8256-58).
Adopted by the Canadian federal government from 1996-01-01. Replaces NAD83 [sometimes called NAD83(Original)]. Replaced by NAD83(CSRS)v2.',
        ],
        'urn:ogc:def:datum:EPSG::1193' => [
            'name' => 'North American Datum of 1983 (CSRS) version 2',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 1997.0,
            'extent_name' => 'Canada',
            'help' => 'Defined at reference epoch 1997.00 by a transformation from ITRF96 (see transformation code 8259). The frame is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
Published 1998-01-01; adopted by the Canadian federal government and the provincial governments of Alberta, Saskatchewan, Manitoba, Quebec, New Brunswick and Prince Edward Island. Replaces NAD83(CSRS96). Replaced by NAD83(CSRS)v3.',
        ],
        'urn:ogc:def:datum:EPSG::1194' => [
            'name' => 'North American Datum of 1983 (CSRS) version 3',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 1997.0,
            'extent_name' => 'Canada',
            'help' => 'Defined at reference epoch 1997.00 by a transformation from ITRF97 (see transformation code 8260). The frame is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
Published 1999-01-01; adopted by the Canadian federal government (2000) and the provincial governments of British Columbia (CRD in 2000, all Victoria Island 2005), Ontario (2008) and Nova Scotia (2000). Replaces NAD83(CSRS)v2. Replaced by NAD83(CSRS)v4.',
        ],
        'urn:ogc:def:datum:EPSG::1195' => [
            'name' => 'North American Datum of 1983 (CSRS) version 4',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 2002.0,
            'extent_name' => 'Canada',
            'help' => 'Defined at reference epoch 2002.00 by a transformation from ITRF2000 (see transformation code 8261). The frame is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
Published 2002-01-01; adopted by the Canadian federal government (2002) and the provincial governments of British Columbia (for mainland only, not Victoria Island) (2005) and Alberta (2004). Replaces NAD83(CSRS)v3. Replaced by NAD83(CSRS)v5.',
        ],
        'urn:ogc:def:datum:EPSG::1196' => [
            'name' => 'North American Datum of 1983 (CSRS) version 5',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 2006.0,
            'extent_name' => 'Canada',
            'help' => 'Defined at reference epoch 2006.00 by a transformation from ITRF2005 (see transformation code 9227). The frame is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
Published 2007-01-01; adopted by the Canadian federal government in 2007. Replaces NAD83(CSRS)v4. Replaced by NAD83(CSRS)v6.',
        ],
        'urn:ogc:def:datum:EPSG::1197' => [
            'name' => 'North American Datum of 1983 (CSRS) version 6',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 2010.0,
            'extent_name' => 'Canada',
            'help' => 'Defined at reference epoch 2010.00 by a transformation from ITRF2008 (see transformation code 8264). The frame is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
Published 2010-01-01; adopted by the Canadian government (2012) and the provincial governments of Manitoba (2014), Ontario (2013), Prince Edward Island (2014), Nova Scotia (2014) and Newfoundland (2012). Replaces NAD83(CSRSv5). Replaced by NAD83(CSRS)v7.',
        ],
        'urn:ogc:def:datum:EPSG::1198' => [
            'name' => 'North American Datum of 1983 (CSRS) version 7',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 2010.0,
            'extent_name' => 'Canada',
            'help' => 'Defined at reference epoch 2010.00 by a transformation from ITRF2014 (see transformation code 8265). The frame is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
Published 2017-05-01; adopted by the Canadian federal government (2017) and the provincial governments of Alberta (2021) and Prince Edward Island (2020). Replaces NAD83(CSRS)v6. Replaced by NAD83(CSRS)v8.',
        ],
        'urn:ogc:def:datum:EPSG::1199' => [
            'name' => 'Greenland Vertical Reference 2000',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greenland - 59°N to 84°N',
            'help' => 'Defined through the gravimetric geoid 2000 model locally aligned with MSL at a number of sites.
Orthometric heights. Replaced by GVR2016.',
        ],
        'urn:ogc:def:datum:EPSG::1200' => [
            'name' => 'Greenland Vertical Reference 2016',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greenland - 58°N to 85°N',
            'help' => 'Defined through the gravimetric geoid 2016 model locally aligned to MSL as measured at Nuuk during the 1960s.
Orthometric heights. Replaces GVR2000.',
        ],
        'urn:ogc:def:datum:EPSG::1201' => [
            'name' => 'System of the Unified Trigonometrical Cadastral Network [JTSK03]',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Slovakia',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::1202' => [
            'name' => 'Baltic 1957',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Czechoslovakia',
            'help' => 'Datum: average water level at Kronstadt 1833. Network adjusted in 1957 as Uniform Precise Leveling Network of Eastern Europe (EPNN).
Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::1204' => [
            'name' => 'European Terrestrial Reference Frame 2005',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF2005 in orientation and scale at epoch 1989.0 realigned to ITRF89 at epoch 1989.0 using 3 translations. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the ITRF2005 velocity field.
Defined by transformation from ITRF2005 (CT 5900). On publication in 2007 of this reference frame, the EUREF TWG recommended that ETRF2000 rather than this reference frame remained as the preferred realization of ETRS89. Replaced by ETRF2014 (code 1206).',
        ],
        'urn:ogc:def:datum:EPSG::1206' => [
            'name' => 'European Terrestrial Reference Frame 2014',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF2014 at epoch 1989.0. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the ITRF2014 velocity field.
Defined by transformation from ITRF2014 (CT code 8366). Replaces ETRF2005 (datum code 1204). Technically superior to ETRF2000 (datum code 1186).',
        ],
        'urn:ogc:def:datum:EPSG::1207' => [
            'name' => 'Macao 1920',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - Macao',
            'help' => 'Fundamental point: Avenida Conselheiro Borja base A, later transferred to Monte da Barra, latitude 22°11\'03.139"N, longitude 113°31\'43.625"E (of Greenwich).
Replaces Macao 1907. In 1955 an adjustment made in 1940 was assessed to have unresolvable conflicts and the 1920 adjustment was reinstated.',
        ],
        'urn:ogc:def:datum:EPSG::1208' => [
            'name' => 'Macao Geodetic Datum 2008',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - Macao',
            'help' => 'ITRF2005 at epoch 2008.38.
Locally sometimes referred to as ITRF2005, this is not strictly correct as it applies only at epoch 2008.38 and ignores subsequent tectonic plate motion.',
        ],
        'urn:ogc:def:datum:EPSG::1209' => [
            'name' => 'Hong Kong Geodetic',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - Hong Kong',
            'help' => 'ITRF96 at epoch 1998.121
Locally sometimes referred to as ITRF96 or WGS 84, these are not strictly correct as it applies only at epoch 1998.121 and ignores subsequent tectonic plate motion.',
        ],
        'urn:ogc:def:datum:EPSG::1210' => [
            'name' => 'Macao Height Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - Macao',
            'help' => 'Mean sea level Ma Kau Seak 1925-1964.
',
        ],
        'urn:ogc:def:datum:EPSG::1211' => [
            'name' => 'NAD83 (Federal Base Network)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - FBN',
            'help' => 'A collection of individual state-wide adjustments including GPS observations made between 1997 and 2004.
In CA CT FL ID MA ME MT NC NH NJ NV NY OR RI SC TN VT WA and WI, replaces the early 1990s HARN adjustment. In rest of CONUS the difference between the HARN and FBN adjustments was under 5cm and the original HARN adjustments were adopted as NAD83(FBN).',
        ],
        'urn:ogc:def:datum:EPSG::1212' => [
            'name' => 'NAD83 (High Accuracy Reference Network - Corrected)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Caribbean - Puerto Rico and US Virgin Islands - onshore',
            'help' => '
In PRVI replaces NAD83(HARN) to correct errors. Replaced by NAD83(FBN).',
        ],
        'urn:ogc:def:datum:EPSG::1213' => [
            'name' => 'Helsinki 1943',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Finland - mainland south of 66°N',
            'help' => 'MSL at Helsinki during 1943.
Uses orthometric heights. Effect of the land uplift during the 2nd national levelling was not taken into account. Replaced by N60 (datum code 5116).',
        ],
        'urn:ogc:def:datum:EPSG::1214' => [
            'name' => 'Serbian Spatial Reference System 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Serbia',
            'help' => 'Densification of ETRF2000 in Serbia at epoch 2010.63.
Replaces SREF98.',
        ],
        'urn:ogc:def:datum:EPSG::1215' => [
            'name' => 'Slovenian Vertical System 2010',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Slovenia - onshore',
            'help' => 'Mean sea level at Koper over 18.6 years, selected epoch is 2010-10-10.
Normal heights. Replaces SVS2000 from 2019-01.',
        ],
        'urn:ogc:def:datum:EPSG::1216' => [
            'name' => 'Serbian Vertical Reference System 2012',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Serbia',
            'help' => 'Mean sea level of Adriatic Sea in 1971.
Normal heights above quasi-geoid. In Serbia replaces Trieste (datum code 1050).',
        ],
        'urn:ogc:def:datum:EPSG::1217' => [
            'name' => 'Camacupa 2015',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Angola',
            'help' => 'Fundamental point: Campo de Aviaçao. Latitude: 12°01\'08.702"S, Longitude = 17°27\'19.515"E (of Greenwich).
Second adjustment. Not used for offshore oil and gas exploration and production.',
        ],
        'urn:ogc:def:datum:EPSG::1218' => [
            'name' => 'MOMRA Terrestrial Reference Frame 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Saudi Arabia',
            'help' => 'ITRF2000 at epoch 2004.00.
13 CORS Fiducial Stations linked to 7 IGS stations by 10-day long GPS survey.',
        ],
        'urn:ogc:def:datum:EPSG::1219' => [
            'name' => 'MOMRA Vertical Geodetic Control',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Saudi Arabia - onshore',
            'help' => 'Mean sea level Jeddah 1969.
',
        ],
        'urn:ogc:def:datum:EPSG::1220' => [
            'name' => 'Reference System de Angola 2013',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Angola',
            'help' => 'Network of 18 stations throughout Angola referenced to ITRF2008 @ 2010.90.
Established through daily PPP solutions in GPS week G1610.',
        ],
        'urn:ogc:def:datum:EPSG::1221' => [
            'name' => 'North American Datum of 1983 (MARP00)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Pacific - US interests Mariana plate',
            'help' => 'Defined by a time-dependent seven parameter transformation of ITRF2000 3D geocentric Cartesian coordinates and velocities at reference epoch 1993.62, aligned to the Mariana plate at other epochs based on an Euler pole rotation.
Replaces NAD83(HARN) (GGN93) and NAD83(FBN) in Guam. Replaced by NAD83(MA11).',
        ],
        'urn:ogc:def:datum:EPSG::1223' => [
            'name' => 'Reseau Geodesique de Wallis et Futuna 1996',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Wallis and Futuna',
            'help' => 'Coincident with ITRF94 at epoch 1993.00.
',
        ],
        'urn:ogc:def:datum:EPSG::1224' => [
            'name' => 'Taiwan Vertical Datum 2001',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Taiwan - onshore - mainland',
            'help' => 'Mean Sea Level at Keelung between 1957 and 1991.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1225' => [
            'name' => 'CR-SIRGAS',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Costa Rica',
            'help' => 'ITRF2008 (IGb08) at epoch 2014.59. Network of 42 GNSS stations of the passive and active reference system.
Replaces CR05 from April 2018.',
        ],
        'urn:ogc:def:datum:EPSG::1226' => [
            'name' => 'Datum Altimetrico de Costa Rica 1952',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Costa Rica - onshore',
            'help' => 'Mean Sea Level 1941-1952 at Puntarenas.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1227' => [
            'name' => 'SIRGAS Continuously Operating Network DGF00P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2000.4,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to ITRF97 at epoch 2000.40. Realized by a frame of 31 continuously operating stations using GPS observations from June 1996 to February 2000. Velocity model VEMOS2003 used to propagate coordinates to the frame reference epoch.
DGF00P01 is included in ITRF2000 as a regional densification for South America. Replaced by DGF01P01 (datum code 1228).',
        ],
        'urn:ogc:def:datum:EPSG::1228' => [
            'name' => 'SIRGAS Continuously Operating Network DGF01P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2000.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to ITRF2000 at epoch 2000.00. Realized by a frame of 48 continuously operating stations using GPS observations from June 1996 to April 2001. Velocity model VEMOS2003 used to propagate coordinates to the frame reference epoch.
Replaces DGF00P01 (datum code 1227). Replaced by DGF01P02 (datum code 1229).',
        ],
        'urn:ogc:def:datum:EPSG::1229' => [
            'name' => 'SIRGAS Continuously Operating Network DGF01P02',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1998.4,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to ITRF2000 at epoch 1998.40. Realized by a frame of 49 continuously operating stations using GPS observations from June 1996 to October 2001. Velocity model VEMOS2003 used to propagate coordinates to the frame reference epoch.
Replaces DGF01P01 (datum code 1228). Replaced by DGF02P01 (datum code 1230).',
        ],
        'urn:ogc:def:datum:EPSG::1230' => [
            'name' => 'SIRGAS Continuously Operating Network DGF02P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2000.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to ITRF2000 at epoch 2000.00. Realized by a frame of 53 continuously operating stations using GPS observations from June 1996 to July 2002. Velocity model VEMOS2003 used to propagate coordinates to the frame reference epoch.
Replaces DGF01P02 (datum code 1229). Replaced by DGF04P01 (datum code 1331).',
        ],
        'urn:ogc:def:datum:EPSG::1231' => [
            'name' => 'SIRGAS Continuously Operating Network DGF04P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2003.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to ITRF2000 at epoch 2003.00. Realized by a frame of 69 continuously operating stations using GPS observations from June 1996 to July 2004. Velocity model VEMOS2003 used to propagate coordinates to the frame reference epoch.
Replaces DGF02P01 (datum code 1230). Replaced by DGF05P01 (datum code 1232).',
        ],
        'urn:ogc:def:datum:EPSG::1232' => [
            'name' => 'SIRGAS Continuously Operating Network DGF05P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2004.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to ITRF2000 at epoch 2004.00. Realized by a frame of 95 continuously operating stations using GPS observations from June 1996 to September 2005. Velocity model VEMOS2003 used to propagate coordinates to the frame reference epoch.
Replaces DGF04P01 (datum code 1231). Replaced by DGF06P01 (datum code 1233).',
        ],
        'urn:ogc:def:datum:EPSG::1233' => [
            'name' => 'SIRGAS Continuously Operating Network DGF06P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2004.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to ITRF2000 at epoch 2004.00. Realized by a frame of 94 continuously operating stations using GPS observations from June 1996 to June 2006. Velocity model VEMOS2003 used to propagate coordinates to the frame reference epoch.
Replaces DGF05P01 (datum code 1232). Replaced by DGF07P01 (datum code 1234).',
        ],
        'urn:ogc:def:datum:EPSG::1234' => [
            'name' => 'SIRGAS Continuously Operating Network DGF07P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2004.5,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to IGS05 at epoch 2004.50. Realized by a frame of 106 continuously operating stations using GPS observations in 3 periods between December 2001 and October 2007. Velocity model VEMOS2003 used to propagate coordinates to the frame reference epoch.
Replaces DGF06P01 (datum code 1233). Replaced by DGF08P01 (datum code 1235).',
        ],
        'urn:ogc:def:datum:EPSG::1235' => [
            'name' => 'SIRGAS Continuously Operating Network DGF08P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2004.5,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to IGS05 at epoch 2004.50. Realized by a frame of 126 continuously operating stations using GPS observations from December 2002 to March 2008. Velocity model VEMOS2003 used to propagate coordinates to the frame reference epoch.
Replaces DGF07P01 (datum code 1234). Replaced by SIR09P01 (datum code 1236).',
        ],
        'urn:ogc:def:datum:EPSG::1236' => [
            'name' => 'SIRGAS Continuously Operating Network SIR09P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2005.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to IGS05 at epoch 2005.00. Realized by a frame of 128 continuously operating stations using GPS observations from January 2000 to January 2009. Velocity model VEMOS2009 used to propagate coordinates to the frame reference epoch.
Replaces DGF08P01 (datum code 1235). Replaced by SIR10P01 (datum code 1237).',
        ],
        'urn:ogc:def:datum:EPSG::1237' => [
            'name' => 'SIRGAS Continuously Operating Network SIR10P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2005.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to ITRF08 at epoch 2005.00. Realized by a frame of 183 continuously operating stations using GPS observations from January 2000 to June 2010. Velocity model VEMOS2009 used to propagate coordinates to the frame reference epoch.
Replaces SIR09P01 (datum code 1236). Replaced by SIR11P01 (datum code 1238).',
        ],
        'urn:ogc:def:datum:EPSG::1238' => [
            'name' => 'SIRGAS Continuously Operating Network SIR11P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2005.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to ITRF08 at epoch 2005.00. Realized by a frame of 230 continuously operating stations using GPS observations from January 2000 to April 2011. Velocity model VEMOS2009 used to propagate coordinates to the frame reference epoch.
Replaces SIR10P01 (datum code 1237). Replaced by SIR13P01 (datum code 1239). Last multi-year solution without the effects of the El Maule earthquake in February 2010.',
        ],
        'urn:ogc:def:datum:EPSG::1239' => [
            'name' => 'SIRGAS Continuously Operating Network SIR13P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2012.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to IGb08 at epoch 2012.00. Realized by a frame of 108 continuously operating stations using GPS observations from April 2010 to June 2013. Velocity model VEMOS2009 used to propagate coordinates to the frame reference epoch.
Replaces SIR11P01 (datum code 1238). Replaced by SIR14P01 (datum code 1240). First multi-year solution after the El Maule earthquake of February 2010.',
        ],
        'urn:ogc:def:datum:EPSG::1240' => [
            'name' => 'SIRGAS Continuously Operating Network SIR14P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2013.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to IGb08 at epoch 2013.00. Realized by a frame of 242 continuously operating stations using GNSS observations from April 2010 to July 2014. Velocity model VEMOS2009 used to propagate coordinates to the frame reference epoch.
Replaces SIR13P01 (datum code 1239). Replaced by SIR15P01 (datum code 1241).',
        ],
        'urn:ogc:def:datum:EPSG::1241' => [
            'name' => 'SIRGAS Continuously Operating Network SIR15P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2013.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to IGb08 at epoch 2013.00. Realized by a frame of 303 continuously operating stations using GNSS observations from March 2010 to April 2015. Velocity model VEMOS2015 used to propagate coordinates to the frame reference epoch.
Replaces SIR14P01 (datum code 1240). Replaced by SIR17P01 (datum code 1242).',
        ],
        'urn:ogc:def:datum:EPSG::1242' => [
            'name' => 'SIRGAS Continuously Operating Network SIR17P01',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2015.0,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - Central America and South America',
            'help' => 'Aligned to IGS14 at epoch 2015.00. Realized by a frame of 345 continuously operating stations using GNSS observations from April 2011 to January 2017. Velocity model VEMOS2017 used to propagate coordinates to the frame reference epoch.
Replaces SIR15P01 (datum code 1241).',
        ],
        'urn:ogc:def:datum:EPSG::1243' => [
            'name' => 'SIRGAS-Chile realization 2 epoch 2010',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Chile',
            'help' => 'IGS08 at epoch 2010.00. Densification of SIRGAS-CON network in Chile, consisting of 120 monumented stations.
Replaces SIRGAS-Chile realization 1 epoch 2002, following significant tectonic deformation. Replaced by SIRGAS-Chile realization 3 epoch 2013.',
        ],
        'urn:ogc:def:datum:EPSG::1244' => [
            'name' => 'IGS97',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1997.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived from ITRF97 at epoch 1997.00 through a subset of stable IGS station coordinates. Preserves the ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
Used for IGS products from GPS week 1065 through GPS week 1142 (2000-06-04 to 2001-12-01). Replaced by IGS00. For all practical purposes coincident with ITRF97.',
        ],
        'urn:ogc:def:datum:EPSG::1245' => [
            'name' => 'IGS00',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1998.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived from ITRF2000 at epoch 1998.00 through a subset of 54 stable IGS station coordinates. Preserves the ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
Used for IGS products from GPS week 1143 through GPS week 1252 (2001-12-02 through 2004-01-10). Replaces IGS97, replaced by IGb00. For all practical purposes coincident with ITRF2000.',
        ],
        'urn:ogc:def:datum:EPSG::1246' => [
            'name' => 'IGb00',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1998.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived from ITRF2000 at epoch 1998.00 through a subset of 99 stable IGS station coordinates. Preserves the ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
Used for IGS products from GPS week 1253 through GPS week 1399 (2004-01-11 to 2006-11-04). Replaces IGS00, replaced by IGS05. For all practical purposes coincident with ITRF2000.',
        ],
        'urn:ogc:def:datum:EPSG::1247' => [
            'name' => 'IGS05',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2000.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived from ITRF2005 at epoch 2000.00 through a subset of 139 stable IGS station coordinates. Preserves the ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
Used for IGS products from GPS week 1400 through GPS week 1631 (2006-11-05 to 2011-04-16). Replaces IGb00, replaced by IGb08. For all practical purposes coincident with ITRF2005.',
        ],
        'urn:ogc:def:datum:EPSG::1248' => [
            'name' => 'IGb08',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2005.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived from ITRF2008 at epoch 2005.00 through a subset of 232 stable IGS station coordinates. Preserves the ITRF origin, orientation and scale, but without any distortions introduced from non-GNSS space-geodetic techniques.
Used for IGS products from GPS week 1709 through GPS week 1933 (2012-10-07 to 2017-01-28). Replaces IGS08, replaced by IGS14. For all practical purposes coincident with ITRF2008.',
        ],
        'urn:ogc:def:datum:EPSG::1249' => [
            'name' => 'North American Datum of 1983 (PACP00)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Pacific - US interests Pacific plate',
            'help' => 'Defined by a time-dependent seven parameter transformation of ITRF2000 3D geocentric Cartesian coordinates and velocities at reference epoch 1993.62, aligned to the Pacific plate at other epochs based on an Euler pole rotation.
Replaces NAD83(HARN) and NAD83(FBN) in Hawaii and American Samoa. Replaced by NAD83(PA11).',
        ],
        'urn:ogc:def:datum:EPSG::1250' => [
            'name' => 'IGN 2008 LD',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - La Desirade - onshore',
            'help' => 'Mean sea level at Pointe-à-Pitre. Origin = IGN Marker 20A with defined height of 0.50 m above msl of 1987.
Orthometric heights. Replaces IGN 1992 LD (datum code 5212).',
        ],
        'urn:ogc:def:datum:EPSG::1251' => [
            'name' => 'Kosovo Reference System 2001',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Kosovo',
            'help' => 'Densification of ETRF97 in Kosovo at epoch 2001.25.
First order network of 32 stations connected to 8 EUREF Permanant Network (EPN) stations observed march-April 2001. Densified in 2012.',
        ],
        'urn:ogc:def:datum:EPSG::1252' => [
            'name' => 'SIRGAS-Chile realization 3 epoch 2013',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Chile',
            'help' => 'IGb08 at epoch 2013.00. Densification of SIRGAS-CON network in Chile, consisting of 130 monumented stations.
Replaces SIRGAS-Chile realization 2 epoch 2010, following significant tectonic deformation. Replaced by SIRGAS-Chile realization 4 epoch 2016.',
        ],
        'urn:ogc:def:datum:EPSG::1253' => [
            'name' => 'SIRGAS-Chile realization 4 epoch 2016',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Chile',
            'help' => 'IGb08 at epoch 2016.00. Densification of SIRGAS-CON network in Chile, consisting of 200 monumented stations.
Replaces SIRGAS-Chile realization 3 epoch 2013. Replaced by SIRGAS-Chile realization 5 epoch 2021 due to significant tectonic deformation.',
        ],
        'urn:ogc:def:datum:EPSG::1255' => [
            'name' => 'Nivellement General de Nouvelle Caledonie 2008',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia - Belep, Grande Terre, Ile des Pins, Loyalty Islands',
            'help' => '
Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::1256' => [
            'name' => 'Canadian Geodetic Vertical Datum of 2013 (CGG2013a) epoch 2010',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 2010.0,
            'extent_name' => 'Canada',
            'help' => 'Defined by the equipotential surface W0 = 62,636,856.0 m^2s^-2, which by convention represents the coastal mean sea level for North America, realized through CGG2013a at epoch 2010.0. Geoid velocity defined as zero with respect to NAD83(CSRS).
Replaces CGVD2013(CGG2013). CGVD2013(CGG2013a) is a static datum. However heights referenced to it change with time, primarily due to glacial isostasy. In practice static snapshots are used at epochs 2010.0 (this datum), 2002.0 and 1997.0.',
        ],
        'urn:ogc:def:datum:EPSG::1257' => [
            'name' => 'Tapi Aike',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina - south Santa Cruz',
            'help' => '
Replaced by Campo Inchauspe (code 6221) for topographic mapping, use for oil exploration and production continues.',
        ],
        'urn:ogc:def:datum:EPSG::1258' => [
            'name' => 'Ministerio de Marina Norte',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina - Tierra del Fuego onshore',
            'help' => '
Developed by the Servicio de Hidrografia Naval.',
        ],
        'urn:ogc:def:datum:EPSG::1259' => [
            'name' => 'Ministerio de Marina Sur',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina - Tierra del Fuego onshore',
            'help' => '
Developed by the Servicio de Hidrografia Naval.',
        ],
        'urn:ogc:def:datum:EPSG::1260' => [
            'name' => 'Sistema de Referencia Vertical Nacional 2016',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina - onshore',
            'help' => 'Mean Sea Level 1923 at Mar del Plata defined at station 71 (C = 121.64978 m^2s^-2) = 12.43m for mainland, Ushuaia station PF1N(383) (C = 38.427 m^2s^-2) =  3.915m for Tierra del Fuego. These geopotential numbers correspond with historic values.
Replaces SRVN71.',
        ],
        'urn:ogc:def:datum:EPSG::1261' => [
            'name' => 'European Vertical Reference Frame 2000 Austria',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Austria',
            'help' => 'Geopotential numbers of the EVRF2000 (UELN95/98) node points in Austria converted to orthometric heights using a digital surface model.
Geoid surface is smoother than the EVRF2000 quasigeoid.',
        ],
        'urn:ogc:def:datum:EPSG::1262' => [
            'name' => 'South Africa Land Levelling Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'South Africa - onshore',
            'help' => 'Mean Sea Level at Cape Town harbour 1900 and 1907, referred to Datum Benchmark BM1.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1263' => [
            'name' => 'Oman National Geodetic Datum 2017',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Oman',
            'help' => 'Oman primary network of 39 stations tied to ITRF2014 at epoch 2017.24.
Replaces ONGD14 from March 2019.',
        ],
        'urn:ogc:def:datum:EPSG::1264' => [
            'name' => 'HS2 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - London to Birmingham and Crewe',
            'help' => 'Defined through application of the HS2TN02 transformation to ETRS89 as realized through OSNet v2001 CORS. Subsequently realized through application of the HS2TN15 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created to support intermediate CRS "HS2-IRF" in the emulation of the HS2P1+14 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1265' => [
            'name' => 'HS2 Vertical Reference Frame',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - London to Birmingham and Crewe',
            'help' => 'Equivalent to Ordnance Datum Newlyn as realized through OSNet v2001 and OSGM02.
After introduction of OSNet v2009 CORS, OSTN15 and the OSGM15 geoid model, the HS2 VRF is maintained equivalent to OSNet v2001 and OSGM02 through HS2GM15 (code 9304).',
        ],
        'urn:ogc:def:datum:EPSG::1266' => [
            'name' => 'TPEN11 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Liverpool to Leeds',
            'help' => 'Defined through the application of the TPEN11 NTv2 transformation (code 9365) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2020 to support intermediate CRS "TPEN11-IRF" in the emulation of the combined TPEN11 Snake and TPEN11ext Snake map projections.',
        ],
        'urn:ogc:def:datum:EPSG::1267' => [
            'name' => 'Wiener Null',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Austria - Vienna',
            'help' => 'Historic benchmark on the Schwedenbrücke over an artificial channel of River Danube (Donaukanal) with GHA height of 156.680m.
',
        ],
        'urn:ogc:def:datum:EPSG::1268' => [
            'name' => 'Kingdom of Saudi Arabia Geodetic Reference Frame 2017',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Saudi Arabia',
            'help' => 'ITRF2014 at epoch 2017.00.
Realized by 333 GNSS stations in Saudi Arabia aligned to ITRF2014 through core network of 46 stations adjusted to 15 IGS stations.',
        ],
        'urn:ogc:def:datum:EPSG::1269' => [
            'name' => 'Kingdom of Saudi Arabia Vertical Reference Frame Jeddah 2014',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Saudi Arabia - onshore',
            'help' => 'Jeddah tide gauge bench mark TGBM-B height of 1.7446m at 2014.75.
',
        ],
        'urn:ogc:def:datum:EPSG::1270' => [
            'name' => 'Mean Sea Level Netherlands',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Netherlands - offshore and nearshore ',
            'help' => 'Surface defined through the nlgeo geoid model applied to ETRS89.
Coincides with NAP datum plane, extended offshore through the nlgeo geoid model. Approximates physical mean sea surface to a few decimetres.',
        ],
        'urn:ogc:def:datum:EPSG::1271' => [
            'name' => 'MML07 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - London to Sheffield',
            'help' => 'Defined through the application of the MML07 NTv2 transformation (code 9369) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2020 to support intermediate CRS "MML07-IRF" in the emulation of the MML07 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1272' => [
            'name' => 'IGb14',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2010.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Daily IGS combined operational solutions of GPS weeks 730 to 2092. IGb14 is aligned in origin, scale and orientation to IGS14 via a subset of 233 selected stations. As IGS14 is aligned to ITRF2014, IGb14 is also aligned to ITRF2014.
Used for IGS products from GPS week 2106 (2020-05-17). Replaces IGS14. Compared to IGS14, IGb14 benefits from 5 more years of input data, a revised discontinuity list and 9 additional stations. For all practical purposes coincident with ITRF2014.',
        ],
        'urn:ogc:def:datum:EPSG::1273' => [
            'name' => 'AbInvA96_2020 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Aberdeen to Inverness',
            'help' => 'Defined through the application of the AbInvA96_2000 NTv2 transformation (code 9386) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2020 to support intermediate CRS "AbInvA96_2020-IRF" in the emulation of the AbInvA96_2020 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1274' => [
            'name' => 'European Vertical Reference Frame 2019',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - EVRF2019',
            'help' => 'Fixed to geopotential values of 12 stable stations of the EVRF2007 solution. Re-adjusted in September 2020. Reduced to epoch 2000.0 for Nordic countries and Russia using the NKG2016LU_lev uplift model and for Switzerland using CHVRF15 velocities.
Following EVRS conventions, EVRF2019 is a zero-tide surface. Replaces EVRF2007 (datum code 5215).',
        ],
        'urn:ogc:def:datum:EPSG::1275' => [
            'name' => 'Mallorca',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Balearic Islands - Mallorca',
            'help' => 'Mean Sea Level at Palma de Mallorca harbour between April 1997 and December 2006.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1276' => [
            'name' => 'Menorca',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Balearic Islands - Menorca',
            'help' => 'Mean Sea Level at Ciutadella harbour between June 2007 and June 2008.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1277' => [
            'name' => 'Ibiza',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Balearic Islands - Ibiza',
            'help' => 'Mean Sea Level at Ibiza harbour between January 2003 and December 2005.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1278' => [
            'name' => 'Lanzarote',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands - Lanzarote',
            'help' => 'Mean Sea Level at Naos harbour, Arrecife, between 1994 and 1995.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1279' => [
            'name' => 'Fuerteventura',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands - Fuerteventura',
            'help' => 'Mean Sea Level at Puerto del Rosario harbour between 1999-09-08 and 2000-12-31.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1280' => [
            'name' => 'Gran Canaria',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands - Gran Canaria',
            'help' => 'Mean Sea Level at Las Palmas de Gran Canaria harbour between 1992 and 1997.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1281' => [
            'name' => 'Tenerife',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands - Tenerife',
            'help' => 'Mean Sea Level at Santa Cruz de Tenerife harbour between 1960 and 1970.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1282' => [
            'name' => 'La Gomera',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands - La Gomera',
            'help' => 'Mean Sea Level at San Sebastian de la Gomera harbour.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1283' => [
            'name' => 'La Palma',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands - La Palma',
            'help' => 'Mean Sea Level at Santa Cruz de la Palma harbour in 1997.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1284' => [
            'name' => 'El Hierro',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands - El Hierro',
            'help' => 'Mean Sea Level at La Estaca harbour in 2000.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1285' => [
            'name' => 'Ceuta 2',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Ceuta',
            'help' => 'Mean Sea Level at Ceuta harbour between March 1944 and December 2006.
Orthometric heights. Replaces an earlier vertical datum in Ceuta harbour measured between 1908 and 1927.',
        ],
        'urn:ogc:def:datum:EPSG::1286' => [
            'name' => 'Pico de las Nieves 1968',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands onshore',
            'help' => 'Pico de las Nieves mountain, Gran Canaria. The fundamental point is a different station to that for PN84.
Replaced by PN84 only on western islands (El Hierro, La Gomera, La Palma and Tenerife). Both PN68 and PN84 replaced by REGCAN95.',
        ],
        'urn:ogc:def:datum:EPSG::1287' => [
            'name' => 'European Vertical Reference Frame 2019 mean tide',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - EVRF2019',
            'help' => 'Derived from 2020-09 zero-tide EVRF2019 adjustment by Cmean = Czero + (0.28841*sin^2(phi)) + (0.00195*sin^4(phi)) - 0.09722 - 0.08432 kgal.m. The offset of 0.08432 forces the mean-tide height to the zero-tide height at the EVRF2000 origin in Amsterdam.
Mean-tide surface, describing how water flows. See EVRF2019 (datum code 1274) for zero-tide surface which is consistent with ETRS conventions.',
        ],
        'urn:ogc:def:datum:EPSG::1288' => [
            'name' => 'British Isles height ensemble',
            'type' => 'ensemble',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - British Isles - UK and Ireland onshore, UKCS',
            'ensemble' => [
                'urn:ogc:def:datum:EPSG::5130',
                'urn:ogc:def:datum:EPSG::5131',
                'urn:ogc:def:datum:EPSG::5101',
                'urn:ogc:def:datum:EPSG::1164',
                'urn:ogc:def:datum:EPSG::5138',
                'urn:ogc:def:datum:EPSG::5140',
                'urn:ogc:def:datum:EPSG::5144',
                'urn:ogc:def:datum:EPSG::5148',
                'urn:ogc:def:datum:EPSG::5147',
            ],
            'help' => 'Ensemble of 9 independent vertical datums now all defined through OS geoid model OSGM15.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1289' => [
            'name' => 'GBK19 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Glasgow to Kilmarnock',
            'help' => 'Defined through the application of the GBK19 NTv2 transformation (code 9454) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2020 to support intermediate CRS "GBK19-IRF" in the emulation of the combined GBK19 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1290' => [
            'name' => 'Lowest Astronomical Tide Netherlands',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Netherlands - offshore and nearshore ',
            'help' => 'Surface defined through the nllat hydroid model applied to ETRS89.
The lowest tide level which can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions.',
        ],
        'urn:ogc:def:datum:EPSG::1291' => [
            'name' => 'Australian Terrestrial Reference Frame 2014',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2020.0,
            'anchor_epoch' => null,
            'extent_name' => 'Australia - GDA',
            'help' => 'ITRF2014 at epoch 2020.0.
Densification of ITRF2014 in the Australian region.',
        ],
        'urn:ogc:def:datum:EPSG::1292' => [
            'name' => 'Australian Vertical Working Surface',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Australia - GDA',
            'help' => 'Realized by the Australian gravimetric quasi-geoid (AGQG).
Normal heights. Extends gravity-related heights to offshore. See AHD (datum code 5111) for cadastral survey or local engineering survey including construction or mining.',
        ],
        'urn:ogc:def:datum:EPSG::1293' => [
            'name' => 'Sistem Referensi Geospasial Indonesia 2013',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2012.0,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia',
            'help' => 'ITRF2008 at epoch 2012.0.
Semi-dynamic datum. Geometric element of geodetic control network (JKG). Replaces DGN95 and all older datums.',
        ],
        'urn:ogc:def:datum:EPSG::1294' => [
            'name' => 'Indonesian Geoid 2020 version 1',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia',
            'help' => 'Defined by INAGeoid2020 gravimetric geoid model v1 applied to SRGI2013.
Uses gravity data observed to 2019 fitted to control points on Java and Bali.',
        ],
        'urn:ogc:def:datum:EPSG::1295' => [
            'name' => 'Lyon Turin Ferroviaire 2004',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Lyon-Turin',
            'help' => 'Densification of ETRS89 realised through network of 40 stations adjusted to 7 EUREF reference stations in [email protected].
',
        ],
        'urn:ogc:def:datum:EPSG::1296' => [
            'name' => 'Baltic 1986',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Poland - onshore',
            'help' => 'Mean sea level of Baltic at Kronstadt in 1833. Network adjusted in 1982.

Uses Normal heights. Adopted in 1986.',
        ],
        'urn:ogc:def:datum:EPSG::1297' => [
            'name' => 'European Vertical Reference Frame 2007 Poland',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Poland - onshore',
            'help' => 'Origin: Mean North Sea Level at Amsterdam tide gauge. Normal heights obtained from adjustment of precise leveling campaigns conducted during 1998 - 2012 reduced to epoch 2008.00.

Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::1298' => [
            'name' => 'Estonian Height System 2000',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Estonia - onshore',
            'help' => 'Estonian realisation of EVRF2007. Relevelling observed  2004-2013 and reduced to epoch 2000 using the NKG2005LU empirical land uplift model. EVRF2007 height of Poltsamaa fundamental bench mark (H=55.2114m) held fixed.
Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::1299' => [
            'name' => 'Lithuanian Height System 2007',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Lithuania - onshore',
            'help' => 'Lithuanian realisation of EVRF2007. EVRF2007 heights of 10 points in Lithuania held fixed.
Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::1300' => [
            'name' => 'Bulgarian Height System 2005',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bulgaria - onshore',
            'help' => 'Bulgarian realisation of EVRF2007. EVRF2007 heights of 58 points in Bulgaria held fixed.
Uses Normal heights. Adopted as official Bulgarian height reference datum through decree 153 of 2010-07-29.',
        ],
        'urn:ogc:def:datum:EPSG::1301' => [
            'name' => 'Norwegian Chart Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Norway, Svalbard and Jan Mayen - offshore',
            'help' => 'LAT (sum of all harmonic constituents) with an added safety margin in areas where low water levels frequently deviate from LAT. The safety margin is 20 cm from Utsira to the Swedish border and 30 cm in the inner part of the Oslofjord (north of Drøbak).
Prior to 2000-01-01 the definition of chart datum was Z0 = M2 + S2 + N2 + K2 + K1 + ½Sa plus safety margins (10 cm north of Hordaland, 20 cm in Hordaland, 30 cm from Rogaland to the Swedish border and 40 cm in the inner parts of the Oslofjord).',
        ],
        'urn:ogc:def:datum:EPSG::1302' => [
            'name' => 'Local Tidal Datum at Pago Pago 2020',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'American Samoa - Tutuila island',
            'help' => 'MSL at Pago Pago 2011–2016.
Normal-orthometric heights. Replaces ASVD02 (datum code 1125) in March 2020 after the ASVD02 benchmarks were destroyed by earthquake activity.',
        ],
        'urn:ogc:def:datum:EPSG::1303' => [
            'name' => 'National Vertical Datum 1992',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bangladesh - onshore',
            'help' => 'Mean Sea Level 1992-1994 at tidal station at Rangadia, Chittagong.
',
        ],
        'urn:ogc:def:datum:EPSG::1304' => [
            'name' => 'Red Geodesica Para Mineria en Chile',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2019.0,
            'anchor_epoch' => null,
            'extent_name' => 'Chile',
            'help' => 'Realized through 26 stations in the IGS (SIRGAS-CON) active reference station network in Chile.
',
        ],
        'urn:ogc:def:datum:EPSG::1305' => [
            'name' => 'ETRF2000 Poland',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Poland',
            'help' => 'Polish densification of ETRS89 realized through adjustment of ASG-EUPOS network constrained to 35 EPN stations in [email protected].
Adopted as official Polish reference frame from 2012-12-01 through Ordinance of the Council of Ministers of 15th November 2012 on the state system of spatial reference system.',
        ],
        'urn:ogc:def:datum:EPSG::1306' => [
            'name' => 'Catania 1965',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Italy - Sicily onshore',
            'help' => 'Mean Sea Level at Catania in 1965.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1307' => [
            'name' => 'Cagliari 1956',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Italy - Sardinia onshore',
            'help' => 'Mean Sea Level at Cagliari 1955-1957.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1308' => [
            'name' => 'EOS21 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Tweedmouth to Aberdeen',
            'help' => 'Defined through the application of the EOS21 NTv2 transformation (code 9740) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2021 to support intermediate CRS "EOS21-IRF" in the emulation of the EOS21 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1309' => [
            'name' => 'World Geodetic System 1984 (G2139)',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1024,
            'frame_reference_epoch' => 2016.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of 19 GPS tracking stations aligned with a subset of IGb14 stations at epoch 2016.0. The IGb14 station coordinates are considered to be equivalent to ITRF2014.
Replaces World Geodetic System 1984 (G1762) from 2021-01-03. Tracking station coordinate changes on 2021-03-28 when NGA implemented IGS definition of antenna phase centre offset. Replaced by  World Geodetic System 1984 (G2296) from 2024-01-07.',
        ],
        'urn:ogc:def:datum:EPSG::1310' => [
            'name' => 'ECML14_NB Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Newcastle to Ashington',
            'help' => 'Defined through the application of the ECML14_NB NTv2 transformation (code 9759) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2021 to support intermediate CRS "ECML14_NB-IRF" in the emulation of the ECML14_NB Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1311' => [
            'name' => 'EWR2 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Oxford to Bedford',
            'help' => 'Defined through the application of the EWR2 NTv2 transformation (code 9763) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2021 to support intermediate CRS "EWR2-IRF" in the emulation of the EWR2 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1312' => [
            'name' => 'Reseau Geodesique Francais 1993 v2',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France',
            'help' => "Aligned with ETRF2000 at epoch 2009.0. Based on the French GNSS permanent network (RGP) from 1998 to 2009, and the re-observation of the geodetic points of the French Reference Network (RRF) and French Base Network (RBF)\u{a0}from 2000 to 2011.\nRGF93 v2 is a realization of ETRS89. Replaces RGF93 v1 (datum code 6171) from 2010-06-18. Replaced by RGF93 v2b (datum code 1313) from 2021-01-05.",
        ],
        'urn:ogc:def:datum:EPSG::1313' => [
            'name' => 'Reseau Geodesique Francais 1993 v2b',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France',
            'help' => 'Aligned with ETRF2000 at epoch 2019.0. Derived through reprocessing of the French GNSS permanent network (RGP) in IGS14.
RGF93 v2b is a realization of ETRS89. Third realization of RGF93. Replaces RGF93 v2 (datum code 1312) from 2021-01-05.',
        ],
        'urn:ogc:def:datum:EPSG::1314' => [
            'name' => 'MRH21 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Cardiff to Lincoln',
            'help' => 'Defined through the application of the MRH21 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2021 to support intermediate CRS "MRH21-IRF" in the emulation of the MRH21 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1315' => [
            'name' => 'MOLDOR11 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Manchester to Dore',
            'help' => 'Defined through the application of the MOLDOR11 NTv2 transformation (code 9878) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2021 to support intermediate CRS "MOLDOR11-IRF" in the emulation of the MOLDOR11 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1316' => [
            'name' => 'GNTRANS',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - onshore',
            'help' => 'Surface defined by the EGG97 quasi-geoid model modified in GNTRANS to achieve absolute position optimised for use with DB_REF.
Implemented in GNTRANS. The GNTRANS height surface is available only through the GNTRANS application. Replaced by the GNTRANS2016 height surface (datum code 1318).',
        ],
        'urn:ogc:def:datum:EPSG::1317' => [
            'name' => 'HULLEE13 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Leeds to Hull',
            'help' => 'Defined through the application of the HULLEE13 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS "HULLEE13-IRF" in the emulation of the HULLEE13 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1318' => [
            'name' => 'GNTRANS2016',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - onshore',
            'help' => 'Surface defined by the GCG2016 quasi-geoid model applied to ETRS89.
Approximates the national DHHN2016 levelling surface to around 1cm in lowlands and 2cm in high mountains, but unlike DHHN2016 it is defined by the GCG2016 geoid model. Like DHHN2016, uses Normal heights in the mean tide system.',
        ],
        'urn:ogc:def:datum:EPSG::1319' => [
            'name' => 'EBBWV14 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Newport to Ebbw Vale',
            'help' => 'Defined through the application of the EBBWV14 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS "EBBWV14-IRF" in the emulation of the EBBWV14 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1320' => [
            'name' => 'SCM22 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Motherwell to Inverness',
            'help' => 'Defined through the application of the SCM22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS "SCM22-IRF" in the emulation of the SCM22 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1321' => [
            'name' => 'FNL22 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Inverness to Thurso',
            'help' => 'Defined through the application of the FNL22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS "FNL22" in the emulation of the FNL22 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1322' => [
            'name' => 'International Terrestrial Reference Frame 2020',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2015.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre. Origin = ILRS SLR long-term solution at epoch 2015.0. Zero scale and scale rate between ITRF2020 and the average of VLBI and SLR scales/rates. Orientation = ITRF2014@ 2015.0 with zero rotation rates between the ITRF2020 and ITRF2014.
Realization of the IERS Terrestrial Reference System (ITRS). Replaces ITRF2014 (datum code 1165) from April 2022.',
        ],
        'urn:ogc:def:datum:EPSG::1323' => [
            'name' => 'Svalbard vertical datum 2006',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Arctic - 81°10\'N to 76°10\'N, 4°W to 38°E',
            'help' => 'Mean Sea Level (MSL) at Ny-Ålesund. The SVD2006 surface (arcgp-2006-sk) is the Arctic Gravity Project 2006 (arcgp-2006) surface adjusted to two benchmarks tied to the Ny-Ålesund tide gauge. arcgp-2006-sk=arcgp-2006 - 0.8986m.
',
        ],
        'urn:ogc:def:datum:EPSG::1324' => [
            'name' => 'MWC18 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Manchester, Wigan and Chester',
            'help' => 'Defined through the application of the MWC18 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS MWC18-IRF in the emulation of the MWC18 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1325' => [
            'name' => 'Canadian Geodetic Vertical Datum of 2013 (CGG2013a) epoch 2002',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 2002.0,
            'extent_name' => 'Canada',
            'help' => 'Defined by the equipotential surface W0 = 62,636,856.0 m^2s^-2, which by convention represents the coastal mean sea level for North America, realized through the Canadian gravimetric geoid 2013a applied at epoch 2002.
CGVD2013(CGG2013a) is a static datum; however, heights referenced to it change with time, primarily due to glacial isostasy. This datum supports CGVD2013(CGG2013a) heights at epoch 2002.0. Other snapshots are at epochs 1997.0 and 2010.0.',
        ],
        'urn:ogc:def:datum:EPSG::1326' => [
            'name' => 'Canadian Geodetic Vertical Datum of 2013 (CGG2013a) epoch 1997',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 1997.0,
            'extent_name' => 'Canada',
            'help' => 'Defined by the equipotential surface W0 = 62,636,856.0 m^2s^-2, which by convention represents the coastal mean sea level for North America, realized through the Canadian gravimetric geoid 2013a applied at epoch 1997.0.
CGVD2013(CGG2013a) is a static datum; however, heights referenced to it change with time, primarily due to glacial isostasy. This datum supports CGVD2013(CGG2013a) heights at epoch 1997.0. Other snapshots are at epochs 2002.0 and 2010.0.',
        ],
        'urn:ogc:def:datum:EPSG::1327' => [
            'name' => 'SIRGAS-Chile realization 5 epoch 2021',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Chile',
            'help' => 'Densification of SIRGAS-CON network in Chile, consisting of 97 stations forming the active CORS network (RGN) referenced to IGb2014 (ITRF2014) at epoch 2021.00. Passive stations used in previous realizations have been removed from this solution.
Replaces SIRGAS-Chile realization 4 epoch 2016 from August 2021 due to significant tectonic deformation. 24 additional active CORS used in this realization compared to that of 2016.',
        ],
        'urn:ogc:def:datum:EPSG::1328' => [
            'name' => 'Indonesian Geoid 2020 version 2',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia',
            'help' => 'Defined by INAGeoid2020 gravimetric geoid model v2 applied to SRGI2013.
Uses gravity data observed to 2021 fitted to tide gauge benchmarks across Indonesia.',
        ],
        'urn:ogc:def:datum:EPSG::1329' => [
            'name' => 'Marco Geocentrico Nacional de Referencia 2018',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Colombia',
            'help' => 'Densification of ITRF2014 at epoch 2018.0 in Colombia. Bogota observatory coordinates: Latitude: 4°35\'46.33160"N, longitude: 74°04\'39.02797"W (of Greenwich).
Active network referenced to [email protected] and passive network referenced to [email protected] updated to ITRF2014 using IERS transformations EPSG:7790 and EPSG:8075 respectively then VEMOS2009 velocity model applied to bring coordinates to epoch 2018.0.',
        ],
        'urn:ogc:def:datum:EPSG::1330' => [
            'name' => 'Mean Sea Level UK & Ireland VORF08',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Ireland and UK offshore',
            'help' => 'MSL UK & Ireland VORF08 is defined by the Vertical Offshore Reference Frame v2.11 2008. MSL UK & Ireland VORF08 is reduced to epoch 2000.0.
OSGM05 model used.',
        ],
        'urn:ogc:def:datum:EPSG::1331' => [
            'name' => 'Chart Datum UK & Ireland VORF08',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Ireland and UK offshore',
            'help' => 'CD UK & Ireland VORF08 is defined by the Vertical Offshore Reference Frame v2.11 2008.
By international agreement, Chart Datum is defined as a level so low that the tide will not frequently fall below it. In the United Kingdom and Ireland, this level is normally the level of approximate Lowest Astronomical Tide.',
        ],
        'urn:ogc:def:datum:EPSG::1332' => [
            'name' => 'System 34 Jylland Intermediate Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore Jutland and Funen',
            'help' => 'S34 fundamental point: Agri Bavnehøj, latitude 56°13\'48.217"N, longitude 2°02\'22.629"W of Copenhagen meridian where FE=FN=200000m. This reconstruction\'s origin in central Zealand was obtained from inversion of an older polynomial transformation to ED50.
Created in 2022 to support artificial CRS S34J-IRF in the transformation of coordinates between the historic CRS S34J and ETRS89. The data is a reconstruction based on information synthesized in historical empirical transformations to ED50.',
        ],
        'urn:ogc:def:datum:EPSG::1333' => [
            'name' => 'IGS20',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2015.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'A subset of 332 stable, well-performing IGS stations from ITRF2020.
Used for IGS products from GPS week 2238 (2022-11-27). Replaces IGb14. Compared to IGb14, IGS20 contains 98 new stations, mostly in previously sparsely covered areas, but with 25 IGb14 sites removed. For all practical purposes coincident with ITRF2020.',
        ],
        'urn:ogc:def:datum:EPSG::1334' => [
            'name' => 'DoPw22 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Dovey Junction to Pwllheli',
            'help' => 'Defined through the application of the DoPw22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS DoPw22-IRF in the emulation of the DoPw22 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1335' => [
            'name' => 'ShAb07 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Shrewsbury to Aberystwyth',
            'help' => 'Defined through the application of the ShAb07 NTv2 transformation (code 10186) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS ShAb07-IRF in the emulation of the ShAb07 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1336' => [
            'name' => 'CNH22 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Crewe to Holyhead',
            'help' => 'Defined through the application of the CNH22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS CNH22-IRF in the emulation of the CNH22 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1337' => [
            'name' => 'System 34 Sjaelland Intermediate Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore Zealand and Lolland',
            'help' => 'S34 fundamental point: Agri Bavnehøj, latitude 56°13\'48.217"N, longitude 2°02\'22.629"W of Copenhagen meridian where FE=FN=200000m. This reconstruction\'s origin in central Zealand was obtained from inversion of an older polynomial transformation to ED50.
Created in 2022 to support intermediate CRS S34S-IRF in the transformation of coordinates between the historic CRS S34S and ETRS89. The data is a reconstruction based on information synthesized in historical empirical transformations to ED50.',
        ],
        'urn:ogc:def:datum:EPSG::1338' => [
            'name' => 'CWS13 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Chester to Shrewsbury',
            'help' => 'Defined through the application of the CWS13 NTv2 transformation (code 10197) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS CWS13-IRF in the emulation of the CWS13 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1339' => [
            'name' => 'DIBA15 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Didcot to Banbury',
            'help' => 'Defined through the application of the DIBA15 NTv2 transformation (code 10205) to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS DIBA15-IRF in the emulation of the DIBA15 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1340' => [
            'name' => 'GWPBS22 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - London to Swansea',
            'help' => 'Defined through the application of the GWPBS22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS GWPBS22-IRF in the emulation of the GWPBS22 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1341' => [
            'name' => 'GWWAB22 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Cardiff and the valleys',
            'help' => 'Defined through the application of the GWWAB22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS GWWAB22-IRF in the emulation of the GWWAB22 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1342' => [
            'name' => 'GWWWA22 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Swansea to Fishguard',
            'help' => 'Defined through the application of the GWWWA22 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS GWWWA22-IRF in the emulation of the GWWWA22 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1343' => [
            'name' => 'MALS09 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - London to Leamington Spa',
            'help' => 'Defined through the application of the MALS09 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS MALS09-IRF in the emulation of the MALS09 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1344' => [
            'name' => 'OxWo08 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Oxford to Worcester',
            'help' => 'Defined through the application of the OxWo08 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS OxWo08-IRF in the emulation of the OxWo08 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1345' => [
            'name' => 'SYC20 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Shrewsbury to Crewe',
            'help' => 'Defined through the application of the SYC20 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS SYC20-IRF in the emulation of the SYC20 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1346' => [
            'name' => 'System 45 Bornholm Intermediate Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore Bornholm',
            'help' => 'Pseudo origin south of Bornholm, obtained from inversion of an older transformation. The historical Danish System 45 was ad-hoc and not based on any formal datum and projection definitions.
Created in 2022 to support intermediate CRS S45B-IRF in the transformation of coordinates between the historic CRS S45 and ETRS89. The data are reconstructions based on information synthesized in historical empirical transformations to ED50.',
        ],
        'urn:ogc:def:datum:EPSG::1347' => [
            'name' => 'Generalstabens System Intermediate Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7051',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore Jutland, Funen, Zealand and Lolland',
            'help' => 'The old Copenhagen Observatory at Rundetårn. Originally, longitudes were reckoned from the meridian through the observatory but in this reconstruction longitudes are referenced to the Greenwich meridian.
Created in 2022 to support intermediate CRS GS-IRF in the transformation of coordinates between the historic Generalstaben System and ETRS89. The data are reconstructions based on information synthesized in historical empirical transformations to ED50.',
        ],
        'urn:ogc:def:datum:EPSG::1348' => [
            'name' => 'Generalstabens System Bornholm Intermediate Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7051',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore Bornholm',
            'help' => 'The old Copenhagen Observatory at Rundetårn. Originally, longitudes were reckoned from the meridian through the observatory but in this reconstruction longitudes are referenced to the Greenwich meridian.
Created in 2022 to support intermediate CRS GSB-IRF in the transformation of coordinates between the historic Generalstaben System and ETRS89. The data are reconstructions based on information synthesized in historical empirical transformations to ED50.',
        ],
        'urn:ogc:def:datum:EPSG::1349' => [
            'name' => 'Copenhagen Commune Intermediate Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7051',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - Copenhagen',
            'help' => 'Arbitrary origin, apparently based on monument coordinates given in the Generalstabens System.
Created in 2022 to support intermediate CRS KK-IRF in the transformation of coordinates between the historic Copenhagen Commune CRS and ETRS89. The data are reconstructions based on information synthesized in historical empirical transformations to ED50.',
        ],
        'urn:ogc:def:datum:EPSG::1350' => [
            'name' => 'Ostenfeld  Intermediate Datum',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - northern Schleswig',
            'help' => 'Origin of historic system is near the German village Ostenfeld.  This Danish reconstruction defined/derived through inversion of an older transformation.
Created in 2022 to support intermediate CRS OS-IRF in the transformation of coordinates between the historic Ostenfeld system of Prussia and ETRS89. The data are reconstructions based on information synthesized in historical empirical transformations.',
        ],
        'urn:ogc:def:datum:EPSG::1351' => [
            'name' => 'SMITB20 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Okehampton to Penstone',
            'help' => 'Defined through the application of the SMITB20 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS SMITB20-IRF in the emulation of the SMITB20 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1352' => [
            'name' => 'RBEPP12 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Reading to Penzance',
            'help' => 'Defined through the application of the RBEPP12 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2022 to support intermediate CRS RBEPP12-IRF in the emulation of the RBEPP12 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1353' => [
            'name' => 'ETRS89/DREF91 Realization 2016',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany',
            'help' => 'Realized by GNSS campaign 2008. Results were transformed from IGS05 epoch 2008.46 to ITRF2005 to ETRF2000, subsequently to ETRS89/DREF91 Realization 2002 (former German ETRS89 realization) by 3 rotation parameters.
German national realization of ETRS89. Replaces ETRS89/DREF91 Realization 2002 from 2016-12-01.',
        ],
        'urn:ogc:def:datum:EPSG::1354' => [
            'name' => 'Nivellement General de l\'Algerie 2022',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Algeria - onshore',
            'help' => 'Fundamental benchmark attached to the tide gauge at basin of Algiers old port with defined height of 1.1168m.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1355' => [
            'name' => 'Sonatrach Reference Frame 2020',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Algeria',
            'help' => 'Aligned with IGS14 at epoch 2020.15.  RGSH2020 primary network of 22 stations throughout Algeria connected to 15 IGS stations.
Internal accuracy of network is 6-8mm.',
        ],
        'urn:ogc:def:datum:EPSG::1356' => [
            'name' => 'Latvian coordinate system 2020',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Latvia',
            'help' => 'Aligned with ETRF2014 at epoch 2020.28. Derived at 5 well-distributed base stations of the Latvian GNSS permanent network (LATREF) in IGb14, transformed to ETRF2014 using EUREF parameters (CT code 8366).
LKS-2020 is the second national realization of ETRS89. Replaces LKS-92 (datum code 6661).',
        ],
        'urn:ogc:def:datum:EPSG::1357' => [
            'name' => 'Reseau Geodesique de Nouvelle Caledonie 2015',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia',
            'help' => 'Aligned with ITRF2008 at epoch 2015.0.
Replaces RGNC91-93.',
        ],
        'urn:ogc:def:datum:EPSG::1358' => [
            'name' => 'BH_ETRS89',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bosnia and Herzegovina',
            'help' => 'Densification of ETRF2000 in Bosnia and Herzegovina at epoch 2011.307.
ETRS89 in Bosnia and Herzegovina, realized through the coordinates of 17 stations of the GNSS active FBiHPOS network in conjunction with 17 stations of the Serbia SRPOS network.',
        ],
        'urn:ogc:def:datum:EPSG::1359' => [
            'name' => 'Hughes 1980',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7058',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Centre of the Earth.
Used in US Air Force Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave Imager (SSM/I) and Special Sensor Microwave Imager/Sounder (SSMIS) processing software.',
        ],
        'urn:ogc:def:datum:EPSG::1360' => [
            'name' => 'NSIDC International 1924 Authalic Sphere',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7057',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Created to support EASE-Grid v1. Note: for EASE-Grid v2, WGS 84 used.',
        ],
        'urn:ogc:def:datum:EPSG::1361' => [
            'name' => 'Chart Datum Portugal ',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - offshore',
            'help' => 'ZH is located below the level of the Lowest Astronomical Tide (LAT).
.',
        ],
        'urn:ogc:def:datum:EPSG::1362' => [
            'name' => 'Formentera',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Balearic Islands - Formentera',
            'help' => 'Mean Sea Level at La Sabina harbour between 2000-10-25 and 2001-04-18.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1363' => [
            'name' => 'Alboran',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Alboran',
            'help' => 'Mean Sea Level at Alboran harbour between 2017-01-01 and 2019-12-31.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::1364' => [
            'name' => 'Melilla',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Melilla',
            'help' => 'Mean Sea Level at Melilla harbour between 2008-01-01 and 2019-12-31.
Orthometric heights. Replaces an earlier vertical datum in Ceuta harbour measured between 1908 and 1927.',
        ],
        'urn:ogc:def:datum:EPSG::1365' => [
            'name' => 'North American Datum of 1983 (CSRS) version 8',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 2010.0,
            'extent_name' => 'Canada',
            'help' => 'Defined at reference epoch 2010.00 by a transformation from ITRF2020 (see transformation code 10415). The frame is kept aligned with the North American tectonic plate at other epochs using the NNR-Nuvel 1A model.
Published 2022-11-27; adopted by the Canadian federal government (2023). Replaces NAD83(CSRS)v7.',
        ],
        'urn:ogc:def:datum:EPSG::1366' => [
            'name' => 'COV23 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Coventry',
            'help' => 'Defined through the application of the COV23 NTv2 transformation to ETRS89 as realized through OSNet v2009 CORS.
Created in 2023 to support intermediate CRS COV23-IRF in the emulation of the COV23 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1367' => [
            'name' => 'Brenner Base Tunnel 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Brenner',
            'help' => 'Realized through a network of stations aligned to [email protected].
Network of BBT stations, including existing nearby stations of the Austrian AREF-TIREF network, the Italian IGM95 network and the Trentino Alto Adige provincial cadastral control network.',
        ],
        'urn:ogc:def:datum:EPSG::1368' => [
            'name' => 'Dansk Vertikal Reference 1990 (2002)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1027,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore',
            'help' => 'Benchmark at Århus cathedral referenced to mean sea level determined during 1990 at 10 tide gauges: Esbjerg, Fredericia, Frederikshavn, Gedser, Hirtshals, Hornbæk, Korsør, København, Slipshavn and Århus.
First geoid-based realization of DVR90. Replaced by DVR90(2013).',
        ],
        'urn:ogc:def:datum:EPSG::1369' => [
            'name' => 'Dansk Vertikal Reference 1990 (2013)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1027,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore',
            'help' => 'Benchmark at Århus cathedral referenced to mean sea level determined during 1990 at 10 tide gauges: Esbjerg, Fredericia, Frederikshavn, Gedser, Hirtshals, Hornbæk, Korsør, København, Slipshavn and Århus.
Second geoid-based realization of DVR90. Replaces DVR90(2002). Replaced by DVR90(2023).',
        ],
        'urn:ogc:def:datum:EPSG::1370' => [
            'name' => 'Dansk Vertikal Reference 1990 (2023)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1027,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore',
            'help' => 'Benchmark at Århus cathedral referenced to mean sea level determined during 1990 at 10 tide gauges: Esbjerg, Fredericia, Frederikshavn, Gedser, Hirtshals, Hornbæk, Korsør, København, Slipshavn and Århus.
Second geoid-based realization of DVR90. Replaces DVR90(2013).',
        ],
        'urn:ogc:def:datum:EPSG::1371' => [
            'name' => 'Dansk Vertikal Reference 1990 ensemble',
            'type' => 'ensemble',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore',
            'ensemble' => [
                'urn:ogc:def:datum:EPSG::5206',
                'urn:ogc:def:datum:EPSG::1368',
                'urn:ogc:def:datum:EPSG::1369',
                'urn:ogc:def:datum:EPSG::1370',
            ],
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::1372' => [
            'name' => 'Denmark Mean Sea Level (2022)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1028,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - offshore',
            'help' => 'Mean sea level as determined by satellite altimetry and coastal tide gauges. Defined with respect to ETRS89 through the dkmsl_2022 hydroid model.
Replaced by DKMSL(2023).',
        ],
        'urn:ogc:def:datum:EPSG::1373' => [
            'name' => 'Denmark Lowest Astronomical Tide (2022)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1029,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - offshore',
            'help' => 'Mean sea level as determined by satellite altimetry adjusted to LAT using coastal tide gauges and global tide models. Defined with respect to ETRS89 through the dklat_2022 hydroid model.
Replaced by DKLAT(2023).',
        ],
        'urn:ogc:def:datum:EPSG::1374' => [
            'name' => 'Denmark Mean Sea Level (2023)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1028,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - offshore',
            'help' => 'Mean sea level as determined by updated satellite altimetry and coastal tide gauges. Defined with respect to ETRS89 through the dkmsl_2023 hydroid model.
Replaces DKMSL(2022).',
        ],
        'urn:ogc:def:datum:EPSG::1375' => [
            'name' => 'Denmark Lowest Astronomic Tide (2023)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1029,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - offshore',
            'help' => 'Mean sea level as determined by updated satellite altimetry adjusted to LAT using coastal tide gauges and improved global tide models. Defined with respect to ETRS89 through the dklat_2023 hydroid model.
Replaces DKLAT(2022).',
        ],
        'urn:ogc:def:datum:EPSG::1376' => [
            'name' => 'Denmark Mean Sea Level ',
            'type' => 'ensemble',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - offshore',
            'ensemble' => [
                'urn:ogc:def:datum:EPSG::1372',
                'urn:ogc:def:datum:EPSG::1374',
            ],
            'help' => '
MSL as defined through any DKMSL hydroid model without distinction.',
        ],
        'urn:ogc:def:datum:EPSG::1377' => [
            'name' => 'Denmark Lowest Astronomical Tide ',
            'type' => 'ensemble',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - offshore',
            'ensemble' => [
                'urn:ogc:def:datum:EPSG::1373',
                'urn:ogc:def:datum:EPSG::1375',
            ],
            'help' => '
LAT as defined through any DKLAT hydroid model without distinction.',
        ],
        'urn:ogc:def:datum:EPSG::1378' => [
            'name' => 'Greenland Local Mean Sea Level (2022)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greenland - onshore',
            'help' => '77 disconnected local levelling nets introduced between 1945 and 1983 each tied to local mean sea level.
GLLMSL has been introduced to accomodate transformations between older local height systems and the modern nation-wide height systems. In effect these datums are now defined by their transformation to GVR2016.',
        ],
        'urn:ogc:def:datum:EPSG::1382' => [
            'name' => 'European Terrestrial Reference Frame 2020',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1025,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF',
            'help' => 'Coincides with ITRF2020 at epoch 1989.0. Fixed to the stable part of the Eurasian tectonic plate through 3 rotation rates derived from the ITRF2020 velocity field.
Defined by transformation from ITRF2020 (CT code 10572). Replaces ETRF2014 (datum code 1206). Technically superior to ETRF2000 (datum code 1186).',
        ],
        'urn:ogc:def:datum:EPSG::1383' => [
            'name' => 'World Geodetic System 1984 (G2296)',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => 1024,
            'frame_reference_epoch' => 2024.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Aligned to IGS20 through a 7.4 year (2016-01 to 2023-05) time series of daily positions and derived velocities of the 17 WGS 84 tracking stations, determined by Precise Point Positioning (PPP) using IGS precise orbits, clocks and antenna calibrations.
WGS 84 (G2296) is considered to be aligned to IGS20 and  ITRF2020 at all epochs. Replaces World Geodetic System 1984 (G2139) from 2024-01-07.',
        ],
        'urn:ogc:def:datum:EPSG::1384' => [
            'name' => 'Canadian Geodetic Vertical Datum of 1928 (Height Transformation version 2.0)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => 1997.0,
            'extent_name' => 'Canada - CGVD28(HTv2.0)',
            'help' => 'Derived from CGG2000 gravimetric geoid fitted to 1926 benchmarks with CGVD28 levellng-based heights and NAD83(CSRS)v3 ellipsoid heights at epoch 1997.00. Defined by the hybrid geoid model HTv2.0 (Height Transformation version 2.0).
Orthometric heights. Defines CGVD28 where the CGVD28 levelling-based network (datum code 5114) does not exist. Defines CGVD28(HTv2.0) throughout the HTv2.0 coverage. Both CGVD28 and CGVD28(HTv2.0) replaced by CGVD2013 (datum code 1127).',
        ],
        'urn:ogc:def:datum:EPSG::1385' => [
            'name' => 'ECML14 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - London to Edinburgh',
            'help' => 'Defined through the application of the ECML14 NTv2 transformation from ETRS89 as realized through OSNet v2009 CORS.
Created in 2024 to support intermediate CRS "ECML14-IRF" in the emulation of the ECML14 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1386' => [
            'name' => 'WC05 Intermediate Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - London to Glasgow',
            'help' => 'Defined through the application of the WC05 NTv2 transformation from ETRS89 as realized through OSNet v2009 CORS.
Created in 2024 to support intermediate CRS "WC05-IRF" in the emulation of the WC05 Snake map projection.',
        ],
        'urn:ogc:def:datum:EPSG::1387' => [
            'name' => 'Greenland Mean Sea Level (2023)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1030,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greenland - offshore',
            'help' => 'Mean sea level as determined by satellite altimetry and coastal tide gauges. Defined with respect to GR96 through the glmsl_2023 hydroid model.
',
        ],
        'urn:ogc:def:datum:EPSG::1388' => [
            'name' => 'Greenland Lowest Astronomic Tide (2023)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1031,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greenland - offshore',
            'help' => 'Mean sea level as determined by satellite altimetry adjusted to LAT using coastal tide gauges and global tide models. Defined with respect to GR96 through the gllat_2023 hydroid model.
',
        ],
        'urn:ogc:def:datum:EPSG::1390' => [
            'name' => 'Baltic Sea Chart Datum 2000',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Baltic Sea',
            'help' => 'Equipotential surface of the Earth’s gravity field based on the definitions for EVRS and ETRS89 with reference epoch 2000.0 for the postglacial land uplift in Fennoscandia. Zero level is Normaal Amsterdams Peil (NAP). Defined by the BSCD2000 model.
Realized at the national level through coordinates at reference epoch 2000.0 using existing national geodetic infrastructure (see BSCD2000 Specifications document).',
        ],
        'urn:ogc:def:datum:EPSG::5100' => [
            'name' => 'Mean Sea Level',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Not specific to any location or epoch.
The average height of the surface of the sea at a tide station for all stages of the tide over a 19-year period, usually determined from hourly height readings measured from a fixed predetermined reference level. Approximates geoid.',
        ],
        'urn:ogc:def:datum:EPSG::5101' => [
            'name' => 'Ordnance Datum Newlyn',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1026,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Great Britain mainland onshore',
            'help' => 'Mean Sea Level at Newlyn between 1915 and 1921. Initially realised through 1921 and then 1956 levelling network adjustments. From 2002 redefined to be realised through OSGM geoid models.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5102' => [
            'name' => 'National Geodetic Vertical Datum 1929',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - CONUS - onshore',
            'help' => '26 tide gauges in the US and Canada.
Normal orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5103' => [
            'name' => 'North American Vertical Datum 1988',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'North America - Mexico and USA - onshore',
            'help' => 'Mean water level 1970-1983 at Pointe-au-Père (Father\'s Point) and 1984-1988 at Rimouski, Quebec. Benchmark 1250-G = 6.273m.
Helmert orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5104' => [
            'name' => 'Yellow Sea 1956',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - onshore',
            'help' => '2 years tide readings at Qingdao.
Replaced by Yellow Sea 1985 datum.',
        ],
        'urn:ogc:def:datum:EPSG::5105' => [
            'name' => 'Baltic 1977',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - FSU onshore',
            'help' => 'Datum: average water level at Kronstadt 1833. Network adjusted in 1974-78 as Uniform Precise Leveling Network of Eastern Europe (EPNN).
Uses Normal heights. Adjustment also included former Czechoslovakia but was not adopted there, the 1957 adjustment being retained instead.',
        ],
        'urn:ogc:def:datum:EPSG::5106' => [
            'name' => 'Caspian Sea',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - FSU - Caspian Sea',
            'help' => 'Defined as -28.0m Baltic datum
',
        ],
        'urn:ogc:def:datum:EPSG::5109' => [
            'name' => 'Normaal Amsterdams Peil',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Netherlands',
            'help' => 'Mean high tide at Amsterdam in 1684. Onshore NAP is defined by the published heights of benchmarks and since 2018 extended offshore defined by the application of the official transformation from ETRS89, RDNAPTRANS(TM).
Orthometric heights. From 2018, use has been extended from Netherlands onshore to Netherlands onshore and offshore.',
        ],
        'urn:ogc:def:datum:EPSG::5110' => [
            'name' => 'Ostend',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Belgium - onshore',
            'help' => 'Mean low water at Ostend 1855-78 transferred to benchmark GIKMN at Uccle.
Realized through the second general levelling (DNG or TAW) 1981-1999.',
        ],
        'urn:ogc:def:datum:EPSG::5111' => [
            'name' => 'Australian Height Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Australia Christmas and Cocos - onshore',
            'help' => 'Mainland: MSL 1966-68 at 30 gauges around coast. Tasmania: MSL 1972 at Hobart and Burnie. Christmas Island: MSL (details unspecified). Cocos and Keeling Islands: MSL (details unspecified).
Normal-orthometric heights. Initially defined for mainland only, with independent height datums for Australian mainland, Tasmania, Christmas Island and Cocos and Keeling Islands. With introduction of AUSGeoid2020 in 2017, all considered to be AHD.',
        ],
        'urn:ogc:def:datum:EPSG::5112' => [
            'name' => 'Australian Height Datum (Tasmania)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Australia - Tasmania mainland onshore',
            'help' => 'MSL 1972 at Hobart and Burnie.
',
        ],
        'urn:ogc:def:datum:EPSG::5113' => [
            'name' => 'Instantaneous Water Level',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Instantaneous water level uncorrected for tide.
Not specific to any location or epoch.',
        ],
        'urn:ogc:def:datum:EPSG::5114' => [
            'name' => 'Canadian Geodetic Vertical Datum of 1928',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Canada - CGVD28',
            'help' => 'Based on the mean sea level determined from several tidal gauges located in strategic areas of the country.
Supplemented by CGVD28(HTv2.0) (datum code 1384) outside area where levelling network exists. From November 2013 replaced by CGVD2013 (datum code 1127).',
        ],
        'urn:ogc:def:datum:EPSG::5115' => [
            'name' => 'Piraeus Harbour 1986',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greece - onshore',
            'help' => 'MSL determined during 1986.
',
        ],
        'urn:ogc:def:datum:EPSG::5116' => [
            'name' => 'Helsinki 1960',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Finland - onshore',
            'help' => 'MSL at Helsinki during 1960.
Uses orthometric heights. Replaced by N2000 (datum code 1030).',
        ],
        'urn:ogc:def:datum:EPSG::5117' => [
            'name' => 'Rikets hojdsystem 1970',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sweden - onshore',
            'help' => 'Adjustment is referenced to mean high tide at Amsterdams Peil in 1684. To account for land level movements caused by isostatic rebound, heights are reduced to epoch 1970.0 using uplift values computed from repeated levelling observations.
Realized through the second precise levelling network of 1951-1967. Uses Normal heights. Replaces RH00. Replaced in 2005 by RH2000.',
        ],
        'urn:ogc:def:datum:EPSG::5118' => [
            'name' => 'Nivellement General de la France - Lallemand',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France - mainland onshore',
            'help' => 'Rivet number M.ac O-VIII on the Marseille tide gauge site, with the height fixed in 1897 at 1.661 metre above mean sea level between February 2nd 1885 and January 1st 1897.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5119' => [
            'name' => 'Nivellement General de la France - IGN69',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France - mainland onshore',
            'help' => 'Rivet number M.ac O-VIII on the Marseille tide gauge site, with the height fixed in 1897 at 1.661 metre above mean sea level between February 2nd 1885 and January 1st 1897.
Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::5120' => [
            'name' => 'Nivellement General de la France - IGN78',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France - Corsica onshore',
            'help' => 'Marker MM3 situated on the tide gauge site of Ajaccio. Height is 3.640 metre above mean sea level.
Uses Normal heights. Replaces NGC (datum code 5189).',
        ],
        'urn:ogc:def:datum:EPSG::5121' => [
            'name' => 'Maputo',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mozambique - onshore',
            'help' => 'Mean sea level at Maputo.
',
        ],
        'urn:ogc:def:datum:EPSG::5122' => [
            'name' => 'Japanese Standard Levelling Datum 1969',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Japan - onshore - Honshu, Shikoku, Kyushu',
            'help' => '24.4140 metres above mean sea level Tokyo Bay.
Normal-orthometric heights. Replaces JSLD49. Replaced by JGD2000 (vertical) (datum code 1130) from April 2002.',
        ],
        'urn:ogc:def:datum:EPSG::5123' => [
            'name' => 'PDO Height Datum 1993',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Oman - onshore',
            'help' => '
Misclosure between Muscat and Salalah less than .5 meters with differences from of up to 5 meters from old Fahud Datum. The PHD93 adjustment was initially known as the Spine. Replaces Fahud Vertical Datum (code 5124) from 1993.',
        ],
        'urn:ogc:def:datum:EPSG::5124' => [
            'name' => 'Fahud Height Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Oman - mainland',
            'help' => 'Single MSL determination at Mina Al Fahal.
Based on reciprocal trigonometric heighting. Replaced by PHD93 Datum (code 5123) in 1993.',
        ],
        'urn:ogc:def:datum:EPSG::5125' => [
            'name' => 'Ha Tien 1960',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Cambodia and Vietnam - mainland',
            'help' => '
In Vietnam replaced by Hon Dau in 1992.',
        ],
        'urn:ogc:def:datum:EPSG::5126' => [
            'name' => 'Hon Dau 1992',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Vietnam - mainland',
            'help' => '
Replaces Ha Tien in Vietnam.',
        ],
        'urn:ogc:def:datum:EPSG::5127' => [
            'name' => 'Landesnivellement 1902',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Liechtenstein and Switzerland',
            'help' => 'Origin at Repere Pierre du Niton (RPN) defined as 373.6 metres above msl. This value derived from msl at Marseille in 1897 through the French Lallemand network.
Levelling observations not corrected for gravity field. For scientific purposes, replaced by LHHN95.',
        ],
        'urn:ogc:def:datum:EPSG::5128' => [
            'name' => 'Landeshohennetz 1995',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Liechtenstein and Switzerland',
            'help' => 'Origin at Repere Pierre du Niton (RPN) defined as 373.6 metres above msl. This value derived from msl at Marseille in 1897 through the French Lallemand network.
Orthometric heights. For scientific purposes only, replaces LN02.',
        ],
        'urn:ogc:def:datum:EPSG::5129' => [
            'name' => 'European Vertical Reference Frame 2000',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - EVRF2000',
            'help' => 'Height at Normaal Amsterdams Peil (NAP) is zero, defined through height at UELN bench mark 13600 (52°22\'53"N 4°54\'34"E) of 0.71599m. Datum at NAP is mean high tide in 1684.
Realized by geopotential numbers and Normal heights of the United European Levelling Network. Replaced by EVRF2007 (datum code 5215).',
        ],
        'urn:ogc:def:datum:EPSG::5130' => [
            'name' => 'Malin Head',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1026,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Ireland (Republic and Ulster) - onshore',
            'help' => 'Mean sea level between January 1960 and December 1969. Initially realised through levelling network adjustment, from 2002 redefined to be realised through OSGM geoid model.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5131' => [
            'name' => 'Belfast Lough',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1026,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Northern Ireland - onshore',
            'help' => 'Mean sea level between 1951 and 1956 at Clarendon Dock, Belfast. Initially realised through levelling network adjustment, from 2002 redefined to be realised through OSGM geoid model.
Orthometric heights. Malin Head (datum code 5130) used for 1:50,000 and smaller mapping.',
        ],
        'urn:ogc:def:datum:EPSG::5132' => [
            'name' => 'Dansk Normal Nul',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore',
            'help' => 'Mean Sea Level at 10 gauges.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5133' => [
            'name' => 'AIOC 1995',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Azerbaijan - offshore and Sangachal',
            'help' => 'Average level of Caspian Sea at the Oil Rocks tide gauge June-September 1995.
AIOC 1995 datum is 1.7m above Caspian datum and 26.3m below Baltic datum.',
        ],
        'urn:ogc:def:datum:EPSG::5134' => [
            'name' => 'Black Sea',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Georgia',
            'help' => '
Black Sea datum is 0.4m below Baltic datum.',
        ],
        'urn:ogc:def:datum:EPSG::5135' => [
            'name' => 'Hong Kong Principal Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - Hong Kong - onshore',
            'help' => '1.23m below the mean of 19 years (1965-83) observations of tide levels at North Point, Victoria Harbour.
',
        ],
        'urn:ogc:def:datum:EPSG::5136' => [
            'name' => 'Hong Kong Chart Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - Hong Kong - offshore',
            'help' => 'Approximates to Lowest Astronomic Tide level (LAT).
Chart datum is 0.15 metres below Hong Kong Principal Datum (code 5135) and 1.38m below MSL at Quarry Bay.',
        ],
        'urn:ogc:def:datum:EPSG::5137' => [
            'name' => 'Yellow Sea 1985',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - onshore',
            'help' => '20 years tide readings at Qingdao.
Replaces Yellow Sea 1956 datum.',
        ],
        'urn:ogc:def:datum:EPSG::5138' => [
            'name' => 'Ordnance Datum Newlyn (Orkney Isles)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1026,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Orkney Islands onshore',
            'help' => 'Connected to Newlyn datum by triangulation from the British mainland. Initially realised through levelling network adjustment, from 2002 redefined to be realised through OSGM geoid model.
Considered as separate from Newlyn because the accuracy of the trigonometric connection across the Pentland Firth does not meet geodetic levelling specifications. Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5139' => [
            'name' => 'Fair Isle',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Fair Isle onshore',
            'help' => '
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5140' => [
            'name' => 'Lerwick',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1026,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Shetland Islands onshore',
            'help' => 'Mean Sea Level at Lerwick 1979 correlated to pre-1900. Initially realised through levelling network adjustment, from 2002 redefined to be realised through OSGM geoid model.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5141' => [
            'name' => 'Foula',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Foula onshore',
            'help' => '
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5142' => [
            'name' => 'Sule Skerry',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Sule Skerry onshore',
            'help' => '
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5143' => [
            'name' => 'North Rona',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - North Rona onshore',
            'help' => '
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5144' => [
            'name' => 'Stornoway',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1026,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Outer Hebrides onshore',
            'help' => 'Mean Sea Level at Stornoway 1977 correlated to pre-1900. Initially realised through levelling network adjustment, from 2002 redefined to be realised through OSGM geoid model.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5145' => [
            'name' => 'St. Kilda',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - St. Kilda onshore',
            'help' => '
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5146' => [
            'name' => 'Flannan Isles',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Flannan Isles onshore',
            'help' => '
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5147' => [
            'name' => 'St. Marys',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1026,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Scilly Isles onshore',
            'help' => 'Mean Sea Level at St. Marys 1887. Initially realised through levelling network adjustment, from 2002 redefined to be realised through OSGM geoid model.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5148' => [
            'name' => 'Douglas',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1026,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Isle of Man - onshore',
            'help' => 'Mean Sea Level at Douglas 1865. Initially realised through levelling network adjustment, from 2002 redefined to be realised through OSGM geoid model.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5149' => [
            'name' => 'Fao',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East -SE Iraq and SW Iran',
            'help' => '
Established by Hunting Surveys for IPC. In Iran replaced by Bandar Abbas (code 5150). At time of record creation NIOC data in Ahwaz area still usually referenced to Fao. In Iraq replaced by Fao 1979 (code 1028).',
        ],
        'urn:ogc:def:datum:EPSG::5150' => [
            'name' => 'Bandar Abbas',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iran - onshore',
            'help' => 'Average sea level at Bandar Abbas 1995-2001.
Replaces Fao (datum code 5149) in Iran.',
        ],
        'urn:ogc:def:datum:EPSG::5151' => [
            'name' => 'Nivellement General de Nouvelle Caledonie',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia - Grande Terre',
            'help' => 'Rivet AB01 established by SHOM (Service Hydrographique de la Marine)  in 1937 on the Quai des Volontaires in Noumea. Height i: 1.885 metre above mean sea level.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5152' => [
            'name' => 'Poolbeg',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Ireland (Republic and Ulster) - onshore',
            'help' => 'Low water mark of the spring tide on the 8 April 1837 at Poolbeg Lighthouse, Dublin.
Topographic mapping before 1956 in Northern Ireland and 1970 in the Republic of Ireland. Replaced by Belfast Lough and Malin Head (datum codes 5130-31).',
        ],
        'urn:ogc:def:datum:EPSG::5153' => [
            'name' => 'Nivellement General Guyanais 1977',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Guiana - onshore',
            'help' => 'Mean sea level 1936 at Cayenne. Origin = marker BM35 on stone on St Francois battery, Cayenne, with defined elevation of 1.64m above msl. NGG1977 height 0.00m is 1.96m above sounding datum defined at Cayenne in 1936 by SHM.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5154' => [
            'name' => 'Martinique 1987',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Martinique - onshore',
            'help' => 'Mean sea level 1939 at Fort de France. Origin = marker Nbc2 on rebuilt quay wall with defined elevation of 1.38m above msl. Martinique 1987 height 0.00m is 0.56m above SHOM sounding datum.
Orthometric heights. Replaces Martinique 1955 (datum code 5192).',
        ],
        'urn:ogc:def:datum:EPSG::5155' => [
            'name' => 'Guadeloupe 1988',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - Grande-Terre and Basse-Terre - onshore',
            'help' => 'Mean sea level July 1947 to June 1948 at Pointe-Fouillole (Pointe-à-Pitre harbour). Origin = marker GO-7 (formerly AO\'-5) with defined height of 2.67m above msl adopted from 1951 value. Guadeloupe 1988 height 0.00m is 0.46m above 1984 sounding datum.
Orthometric heights. Replaces Guadeloupe 1951 (datum code 5193).',
        ],
        'urn:ogc:def:datum:EPSG::5156' => [
            'name' => 'Reunion 1989',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Reunion - onshore',
            'help' => 'Mean sea level during part of November 1949 at port of Saint-Pierre. Origin = marker AB-100 with defined elevation of 13.808m above msl.
Orthometric heights. Replaces Reunion IGN58. Value of marker AB-100 retains height from 1958 adjustment.',
        ],
        'urn:ogc:def:datum:EPSG::5157' => [
            'name' => 'Auckland 1946',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - North Island - Auckland vcrs',
            'help' => 'MSL at Auckland harbour 1909-1923.
',
        ],
        'urn:ogc:def:datum:EPSG::5158' => [
            'name' => 'Bluff 1955',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - South Island - Bluff vcrs',
            'help' => 'MSL at Invercargill harbour over 8 years between 1918 and 1934.
',
        ],
        'urn:ogc:def:datum:EPSG::5159' => [
            'name' => 'Dunedin 1958',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - South Island - Dunedin vcrs',
            'help' => 'MSL at Dunedin harbour 1918-1937.
',
        ],
        'urn:ogc:def:datum:EPSG::5160' => [
            'name' => 'Gisborne 1926',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - North Island - Gisborne vcrs',
            'help' => 'MSL at Gisborne harbour 1926.
',
        ],
        'urn:ogc:def:datum:EPSG::5161' => [
            'name' => 'Lyttelton 1937',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - South Island - Lyttleton vcrs',
            'help' => 'MSL at Lyttelton harbour over 9 years between 1918 and 1933.
',
        ],
        'urn:ogc:def:datum:EPSG::5162' => [
            'name' => 'Moturiki 1953',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - North Island - Moturiki vcrs',
            'help' => 'MSL at Moturiki Island February 1949 to December 1952.
',
        ],
        'urn:ogc:def:datum:EPSG::5163' => [
            'name' => 'Napier 1962',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - North Island - Hawkes Bay mc Napier vcrs',
            'help' => 'MSL at Napier harbour. Period of derivation unknown.
',
        ],
        'urn:ogc:def:datum:EPSG::5164' => [
            'name' => 'Nelson 1955',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - South Island - Nelson vcrs',
            'help' => 'MSL at Nelson harbour 1939-1942.
',
        ],
        'urn:ogc:def:datum:EPSG::5165' => [
            'name' => 'One Tree Point 1964',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - North Island - One Tree vcrs',
            'help' => 'MSL at Whangarei harbour 1960-1963.
',
        ],
        'urn:ogc:def:datum:EPSG::5166' => [
            'name' => 'Tararu 1952',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - North Island - Tararu vcrs',
            'help' => 'MSL at Tararu Point 1922-1923.
',
        ],
        'urn:ogc:def:datum:EPSG::5167' => [
            'name' => 'Taranaki 1970',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - North Island - Taranaki vcrs',
            'help' => 'MSL at Taranaki harbour 1918-1921.
',
        ],
        'urn:ogc:def:datum:EPSG::5168' => [
            'name' => 'Wellington 1953',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - North Island - Wellington vcrs',
            'help' => 'MSL at Wellington harbour 1909-1946.
',
        ],
        'urn:ogc:def:datum:EPSG::5169' => [
            'name' => 'Waitangi (Chatham Island) 1959',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - Chatham Island onshore',
            'help' => 'MSL at Waitangi harbour collected in 1959.
',
        ],
        'urn:ogc:def:datum:EPSG::5170' => [
            'name' => 'Stewart Island 1977',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - Stewart Island',
            'help' => 'MSL at 3-5 high and low tides at two different locations.
',
        ],
        'urn:ogc:def:datum:EPSG::5171' => [
            'name' => 'EGM96 geoid',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived through EGM84 geoid undulation model consisting of spherical harmonic coefficients to degree and order 360 applied to the WGS 84 ellipsoid.
Replaces EGM84 geoid (datum code 5203). Replaced by EGM2008 geoid (datum code 1027).',
        ],
        'urn:ogc:def:datum:EPSG::5172' => [
            'name' => 'Nivellement General du Luxembourg 1995',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Luxembourg',
            'help' => 'Reference point Wemperhardt defined as 528.030m above Normaal Amsterdams Peil (NAP). Datum at NAP is mean high tide in 1684. Network adjusted in 1995.
Pseudo-orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5173' => [
            'name' => 'Antalya',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Turkey - onshore',
            'help' => 'Mean sea Level at Antalya 1936-71.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5174' => [
            'name' => 'Norway Normal Null 1954',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Norway - onshore',
            'help' => 'MSL defined by regression at 7 gauges with between 17 and 67 years observations.
Includes initial NN1954 system and NNN1957 system. Former name retained. Normal-orthometric heights. Replaced by NN2000.',
        ],
        'urn:ogc:def:datum:EPSG::5175' => [
            'name' => 'Durres',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Albania - onshore',
            'help' => 'Mean Sea Level at Durres.
Normal-orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5176' => [
            'name' => 'Gebrauchshohen ADRIA',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Austria',
            'help' => 'Reference point Hutbiegl defined relative to mean sea level at Trieste in 1875.
Normal-orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5177' => [
            'name' => 'Slovenian Vertical System 2000',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Slovenia - onshore',
            'help' => 'Reference point Ruse defined relative to mean sea level at Trieste in 1875.
Normal-orthometric heights. Promulgated through the National Vertical Network adjustment of 1999.',
        ],
        'urn:ogc:def:datum:EPSG::5178' => [
            'name' => 'Cascais',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - mainland - onshore',
            'help' => 'Mean Sea Level at Cascais 1938.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5179' => [
            'name' => 'Constanta',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Romania - onshore',
            'help' => 'Mean Sea Level at Constanta.
Normal-orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5180' => [
            'name' => 'Alicante',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain and Gibraltar - onshore',
            'help' => 'Mean Sea Level at Alicante between 1870 and 1872.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5181' => [
            'name' => 'Deutsches Haupthoehennetz 1992',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - onshore',
            'help' => 'Network adjusted in 1992. Geopotential number at reference point Wallenhorst defined as value from the UELN-73/86 adjustment. Datum at Normaal Amsterdams Peil (NAP) is mean high tide in 1684.
Replaces DHHN85 in West Germany and SNN76 in East Germany. Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::5182' => [
            'name' => 'Deutsches Haupthoehennetz 1985',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - West Germany all states',
            'help' => 'Network adjusted in 1985. Height of reference point Wallenhorst defined as value from 1928 adjustment. Datum at Normaal Amsterdams Peil (NAP) is mean high tide in 1684.
Replaced by DHHN92. Uses Normal-orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5183' => [
            'name' => 'Staatlichen Nivellementnetzes 1976',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - East Germany all states',
            'help' => 'Network adjusted in 1976. Height at reference point Hoppegarten defined as 1957 value from the UPLN adjustment. Datum at Kronstadt is mean sea level of Baltic in 1833.
Introduced in 1979. Uses Normal heights. Replaced by DHHN92.',
        ],
        'urn:ogc:def:datum:EPSG::5184' => [
            'name' => 'Baltic 1982',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bulgaria - onshore',
            'help' => 'Network adjusted in 1982. Height at reference point Varna defined as 1958 value from the UPLN adjustment. Datum at Kronstadt is mean sea level of Baltic in 1833.
Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::5185' => [
            'name' => 'Baltic 1980',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Hungary',
            'help' => '
Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::5186' => [
            'name' => 'Kuwait PWD',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Kuwait - onshore',
            'help' => 'Mean Low Low Water (MLLW) at Kuwait City.
Approximately 1.03m below MSL.',
        ],
        'urn:ogc:def:datum:EPSG::5187' => [
            'name' => 'KOC Well Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Kuwait - onshore',
            'help' => '
Approximately 3.22m above MSL.',
        ],
        'urn:ogc:def:datum:EPSG::5188' => [
            'name' => 'KOC Construction Datum',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Kuwait - onshore',
            'help' => '
Approximately 1.52m below MSL. Created for the construction of the Mina al Ahmadi refinery.',
        ],
        'urn:ogc:def:datum:EPSG::5189' => [
            'name' => 'Nivellement General de la Corse 1948',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France - Corsica onshore',
            'help' => 'Mean sea level at Ajaccio between 1912 and 1937.
Replaced by IGN78 Corsica (datum 5120).',
        ],
        'urn:ogc:def:datum:EPSG::5190' => [
            'name' => 'Danger 1950',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Pierre and Miquelon - onshore',
            'help' => 'Marker near tide gauge at port of Saint Pierre. Height is 1.26 metres above zero of tide gauge.
',
        ],
        'urn:ogc:def:datum:EPSG::5191' => [
            'name' => 'Mayotte 1950',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mayotte - onshore',
            'help' => 'IGN 1950 marker (height 0.0m) on southwest jetty at Dzaoudzi (Petite-Terre) is 2.18m above zero of tide gauge. SHOM 1953 marker on east (Issoufali) jetty at Dzaoudzi (height 4.74m) is the base for Mayotte heights.
Datum transferred to benchmark RN0 with height of 2.774m above tide gauge on eastern jetty at Mamoudzou (Grand-Terre) in 1979.',
        ],
        'urn:ogc:def:datum:EPSG::5192' => [
            'name' => 'Martinique 1955',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Martinique - onshore',
            'help' => 'Mean sea level at Fort de France 1939. Marker DO-4-II on quay wall with elevation of 1.38m above msl.
Orthometric heights. Replaced by Martinique 1987 (datum code 5154).',
        ],
        'urn:ogc:def:datum:EPSG::5193' => [
            'name' => 'Guadeloupe 1951',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - Grande-Terre and Basse-Terre - onshore',
            'help' => 'Mean sea level July 1947 to June 1948 at Pointe-Fouillole (Pointe-à-Pitre harbour). Origin = marker AO\'-12 with height of 1.917m above msl.
Orthometric heights. Replaced by Guadeloupe 1988 (datum code 5155). Guadeloupe 1951 height 0.00m is 0.629m above 1947-48 sounding datum.',
        ],
        'urn:ogc:def:datum:EPSG::5194' => [
            'name' => 'Lagos 1955',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Nigeria - onshore',
            'help' => 'Mean sea level at Lagos, 1912-1928.
',
        ],
        'urn:ogc:def:datum:EPSG::5195' => [
            'name' => 'Nivellement General de Polynesie Francaise',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - main islands',
            'help' => '
The collection of heterogeneous levelling networks throughout the Society Islands of French Polynesia.',
        ],
        'urn:ogc:def:datum:EPSG::5196' => [
            'name' => 'IGN 1966',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Tahiti',
            'help' => 'Fundamental benchmark: RN501
Included as part of NGPF - see datum code 5195.',
        ],
        'urn:ogc:def:datum:EPSG::5197' => [
            'name' => 'Moorea SAU 1981',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Moorea',
            'help' => 'Fundamental benchmark: RN225
Included as part of NGPF - see datum code 5195.',
        ],
        'urn:ogc:def:datum:EPSG::5198' => [
            'name' => 'Raiatea SAU 2001',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Raiatea',
            'help' => 'Fundamental benchmark: RN1
Included as part of NGPF - see datum code 5195.',
        ],
        'urn:ogc:def:datum:EPSG::5199' => [
            'name' => 'Maupiti SAU 2001',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Maupiti',
            'help' => 'Fundamental benchmark: RN11
Included as part of NGPF - see datum code 5195.',
        ],
        'urn:ogc:def:datum:EPSG::5200' => [
            'name' => 'Huahine SAU 2001',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Huahine',
            'help' => 'Fundamental benchmark: SHOM B3
Included as part of NGPF - see datum code 5195.',
        ],
        'urn:ogc:def:datum:EPSG::5201' => [
            'name' => 'Tahaa SAU 2001',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Tahaa',
            'help' => 'Fundamental benchmark: RN16
Included as part of NGPF - see datum code 5195.',
        ],
        'urn:ogc:def:datum:EPSG::5202' => [
            'name' => 'Bora Bora SAU 2001',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Bora Bora',
            'help' => 'Fundamental benchmark: Vaitape quay SHOM benchmark B.
Included as part of NGPF - see datum code 5195.',
        ],
        'urn:ogc:def:datum:EPSG::5203' => [
            'name' => 'EGM84 geoid',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Derived through EGM84 geoid undulation model consisting of spherical harmonic coefficients to degree and order 180 applied to the WGS 84 ellipsoid.
Replaced by EGM96 geoid (datum code 5171).',
        ],
        'urn:ogc:def:datum:EPSG::5204' => [
            'name' => 'International Great Lakes Datum 1955',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'North America - Great Lakes basin and St Lawrence Seaway',
            'help' => 'Mean water level 1941-1956 at Pointe-au-Père (Father\'s Point), Quebec. Benchmark 1248-G = 3.794m.
Dynamic heights. Adopted in 1962. Replaced by IGLD 1985 in January 1992.',
        ],
        'urn:ogc:def:datum:EPSG::5205' => [
            'name' => 'International Great Lakes Datum 1985',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'North America - Great Lakes basin and St Lawrence Seaway',
            'help' => 'Mean water level 1970-1983 at Pointe-au-Père (Father\'s Point) and 1984-1988 at Rimouski, Quebec. Benchmark 1250-G = 6.273m.
Dynamic heights. Replaces IGLD 1955 from January 1992.',
        ],
        'urn:ogc:def:datum:EPSG::5206' => [
            'name' => 'Dansk Vertikal Reference 1990 (2000)',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => 1027,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Denmark - onshore',
            'help' => 'Benchmark at Århus cathedral referenced to mean sea level determined during 1990 at 10 tide gauges: Esbjerg, Fredericia, Frederikshavn, Gedser, Hirtshals, Hornbæk, Korsør, København, Slipshavn and Århus.
Helmert orthometric heights. First realization of DVR90, based on levelling.',
        ],
        'urn:ogc:def:datum:EPSG::5207' => [
            'name' => 'Croatian Vertical Reference Datum 1971',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Croatia - onshore',
            'help' => 'Mean sea level at five tide gauges in Dubrovnik, Split, Bakar, Rovinj and Kopar at epoch 1971.5
Replaces Trieste (datum code 1050).',
        ],
        'urn:ogc:def:datum:EPSG::5208' => [
            'name' => 'Rikets hojdsystem 2000',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => 2000.0,
            'anchor_epoch' => null,
            'extent_name' => 'Sweden - onshore',
            'help' => 'Adjustment is referenced to mean high tide at Amsterdams Peil in 1684. To account for land level movements caused by isostatic rebound, heights are reduced to epoch 2000.0 using values computed from the RH 2000 LU (=NKG2005LU) uplift model.
Realized through the third precise levelling network of 1979-2003. Adopted in 2005, replacing RH70. Uses Normal heights.',
        ],
        'urn:ogc:def:datum:EPSG::5209' => [
            'name' => 'Rikets hojdsystem 1900',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sweden - onshore',
            'help' => 'Adjustment is referenced to mean sea level at Slussen, Stockholm.
Realized through the first precise levelling network of 1886-1905. Replaced by RH70.',
        ],
        'urn:ogc:def:datum:EPSG::5210' => [
            'name' => 'IGN 1988 LS',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - Les Saintes - onshore',
            'help' => 'Mean sea level 1984 at Terre de Haut. Origin = marker O de -5 with defined height of 1.441m above msl. IGN 1988 LS height 0.00m is 0.46m above 1987 sounding datum; this approximately corresponds with msl at Pointe-à-Pitre (see datum code 5155, CRS 5757).
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5211' => [
            'name' => 'IGN 1988 MG',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - Marie-Galante - onshore',
            'help' => 'Mean sea level 1987 at Grand-Bourg. Origin = marker M0-I with defined height of 0.832m above msl. IGN 1988 MG height 0.00m is 0.46m above 1987 sounding datum; this approximately corresponds with msl at Pointe-à-Pitre (see datum code 5155, CRS code 5757).
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5212' => [
            'name' => 'IGN 1992 LD',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - La Desirade - onshore',
            'help' => 'Mean sea level at Pointe-à-Pitre. Origin = marker A with defined height of 0.792m above msl. IGN 1992 LD height 0.00m is 0.629m above sounding datum at Pointe-à-Pitre.
Orthometric heights. Replaced by IGN 2008 LD (datum code 1250).',
        ],
        'urn:ogc:def:datum:EPSG::5213' => [
            'name' => 'IGN 1988 SB',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - St Barthelemy - onshore',
            'help' => 'Mean sea level 1988 at port of Gustavia. Origin = marker A.ef-2 with defined height of 0.621m above msl. IGN 1988 SB height 0.00m deduced to be 0.201m above mean sea level at Pointe-à-Pitre.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5214' => [
            'name' => 'IGN 1988 SM',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - St Martin - onshore',
            'help' => 'Mean sea level 1949-1950 deduced at Fort Marigot. Origin = marker AS-13 with defined height of 6.990m above msl. IGN 1988 SM height 0.00m deduced to be 0.41m above sounding datum.
Orthometric heights.',
        ],
        'urn:ogc:def:datum:EPSG::5215' => [
            'name' => 'European Vertical Reference Frame 2007',
            'type' => 'vertical',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - EVRF2007',
            'help' => 'Least squares fit to 13 stations of the EVRF2000 solution. Reduced to epoch 2000.0 for Nordic countries using the NKG2005LU uplift model.
Realized by geopotential numbers and Normal heights of the United European Levelling Network. Replaces EVRF2000 (datum code 5129). Replaced by EVRF2019 (datum code 1274).',
        ],
        'urn:ogc:def:datum:EPSG::6001' => [
            'name' => 'Not specified (based on Airy 1830 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7001',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6002' => [
            'name' => 'Not specified (based on Airy Modified 1849 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7002',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6003' => [
            'name' => 'Not specified (based on Australian National Spheroid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7003',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6004' => [
            'name' => 'Not specified (based on Bessel 1841 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6005' => [
            'name' => 'Not specified (based on Bessel Modified ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7005',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6006' => [
            'name' => 'Not specified (based on Bessel Namibia ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7046',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6007' => [
            'name' => 'Not specified (based on Clarke 1858 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7007',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6008' => [
            'name' => 'Not specified (based on Clarke 1866 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6010' => [
            'name' => 'Not specified (based on Clarke 1880 (Benoit) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7010',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6011' => [
            'name' => 'Not specified (based on Clarke 1880 (IGN) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6012' => [
            'name' => 'Not specified (based on Clarke 1880 (RGS) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6013' => [
            'name' => 'Not specified (based on Clarke 1880 (Arc) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7013',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6014' => [
            'name' => 'Not specified (based on Clarke 1880 (SGA 1922) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7014',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6015' => [
            'name' => 'Not specified (based on Everest 1830 (1937 Adjustment) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7015',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6016' => [
            'name' => 'Not specified (based on Everest 1830 (1967 Definition) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7016',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6018' => [
            'name' => 'Not specified (based on Everest 1830 Modified ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7018',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6019' => [
            'name' => 'Not specified (based on GRS 1980 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6020' => [
            'name' => 'Not specified (based on Helmert 1906 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7020',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6021' => [
            'name' => 'Not specified (based on Indonesian National Spheroid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7021',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6022' => [
            'name' => 'Not specified (based on International 1924 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6024' => [
            'name' => 'Not specified (based on Krassowsky 1940 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6025' => [
            'name' => 'Not specified (based on NWL 9D ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7025',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6027' => [
            'name' => 'Not specified (based on Plessis 1817 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7027',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6028' => [
            'name' => 'Not specified (based on Struve 1860 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7028',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6029' => [
            'name' => 'Not specified (based on War Office ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7029',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6030' => [
            'name' => 'Not specified (based on WGS 84 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6031' => [
            'name' => 'Not specified (based on GEM 10C ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7031',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6032' => [
            'name' => 'Not specified (based on OSU86F ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7032',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6033' => [
            'name' => 'Not specified (based on OSU91A ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7033',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6034' => [
            'name' => 'Not specified (based on Clarke 1880 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7034',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6036' => [
            'name' => 'Not specified (based on GRS 1967 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7036',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6041' => [
            'name' => 'Not specified (based on Average Terrestrial System 1977 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7041',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6042' => [
            'name' => 'Not specified (based on Everest (1830 Definition) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7042',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6043' => [
            'name' => 'Not specified (based on WGS 72 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7043',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6044' => [
            'name' => 'Not specified (based on Everest 1830 (1962 Definition) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7044',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6045' => [
            'name' => 'Not specified (based on Everest 1830 (1975 Definition) ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7045',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6047' => [
            'name' => 'Not specified (based on GRS 1980 Authalic Sphere)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7048',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6052' => [
            'name' => 'Not specified (based on Clarke 1866 Authalic Sphere)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7052',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6053' => [
            'name' => 'Not specified (based on International 1924 Authalic Sphere)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7057',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6054' => [
            'name' => 'Not specified (based on Hughes 1980 ellipsoid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7058',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Included for coordinate reference systems where datum is unknown.',
        ],
        'urn:ogc:def:datum:EPSG::6120' => [
            'name' => 'Greek',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greece - onshore',
            'help' => 'Fundamental point: Athens Observatory. Latitude 37°58\'20.132"N, longitude 23°42\'58.815"E (of Greenwich)
See geodetic datum alias 6404. Used as basis of topographic mapping based on Hatt projection. Replaced by GGRS87 (code 6121).',
        ],
        'urn:ogc:def:datum:EPSG::6121' => [
            'name' => 'Greek Geodetic Reference System 1987',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greece - onshore',
            'help' => 'Fundamental point: Dionysos. Latitude 38°04\'33.8"N, longitude 23°55\'51.0"E of Greenwich; geoid height 7.0 m.
Replaced (old) Greek datum. Oil industry work based on ED50.',
        ],
        'urn:ogc:def:datum:EPSG::6122' => [
            'name' => 'Average Terrestrial System 1977',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7041',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Canada - Maritime Provinces',
            'help' => '
In use from 1979. To be phased out in late 1990\'s.',
        ],
        'urn:ogc:def:datum:EPSG::6123' => [
            'name' => 'Kartastokoordinaattijarjestelma (1966)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Finland - onshore',
            'help' => 'Adjustment with fundamental point SF31 based on ED50 transformed to best fit the older VVJ adjustment.
Adopted in 1970.',
        ],
        'urn:ogc:def:datum:EPSG::6124' => [
            'name' => 'Rikets koordinatsystem 1990',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sweden',
            'help' => '
Replaces RT38 adjustment (datum code 6308)',
        ],
        'urn:ogc:def:datum:EPSG::6126' => [
            'name' => 'Lithuania 1994 (ETRS89)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Lithuania',
            'help' => 'Constrained to 4 ETRS89 points in Lithuania from the EUREF Baltic 1992 campaign.
Densification of ETRS89 during the 1992 Baltic campaign.',
        ],
        'urn:ogc:def:datum:EPSG::6127' => [
            'name' => 'Tete',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mozambique - onshore',
            'help' => 'Fundamental point: Tete.
',
        ],
        'urn:ogc:def:datum:EPSG::6128' => [
            'name' => 'Madzansua',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mozambique - west - Tete province',
            'help' => 'Fundamental point: Madzansua.
Replaced by transformation to Tete datum (datum code 6127).',
        ],
        'urn:ogc:def:datum:EPSG::6129' => [
            'name' => 'Observatario',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mozambique - south',
            'help' => 'Fundamental point: Campos Rodrigues observatory, Maputo.
Replaced by transformation to Tete datum (datum code 6127).',
        ],
        'urn:ogc:def:datum:EPSG::6130' => [
            'name' => 'Moznet (ITRF94)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mozambique',
            'help' => 'ITRF94 at epoch 1996.9
',
        ],
        'urn:ogc:def:datum:EPSG::6131' => [
            'name' => 'Indian 1960',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7015',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Cambodia and Vietnam - onshore & Cuu Long basin',
            'help' => 'DMA extension over IndoChina of the Indian 1954 network adjusted  to better fit local geoid.
Also known as Indian (DMA Reduced).',
        ],
        'urn:ogc:def:datum:EPSG::6132' => [
            'name' => 'Final Datum 1958',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iran - FD58',
            'help' => 'Fundamental point: Maniyur.  Latitude: 31°23\'59.19"N, longitude: 48°32\'31.38"E (of Greenwich).
Network included in Nahrwan 1967 adjustment.',
        ],
        'urn:ogc:def:datum:EPSG::6133' => [
            'name' => 'Estonia 1992',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Estonia - onshore',
            'help' => 'Densification from 4 ETRS89 points.
Based on ETRS89 as established during the 1992 Baltic campaign. Replaced by Estonia 1997 adjustment (code 6180).',
        ],
        'urn:ogc:def:datum:EPSG::6134' => [
            'name' => 'PDO Survey Datum 1993',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Oman - onshore',
            'help' => 'Adjustment best fitted to Fahud network.
Replaces Fahud datum (code 6232). Maximum differences to Fahud adjustment are 20 metres.',
        ],
        'urn:ogc:def:datum:EPSG::6135' => [
            'name' => 'Old Hawaiian',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - Hawaii - onshore',
            'help' => 'Fundamental point: Oahu West Base Astro.  Latitude: 21°18\'13.89"N, longitude 157°50\'55.79"W (of Greenwich)
Hawaiian Islands were never on NAD27 but rather on Old Hawaiian Datum. NADCON conversion program provides transformation from Old Hawaiian Datum to NAD83 (original 1986 realization) but making the transformation appear to user as if from NAD27.',
        ],
        'urn:ogc:def:datum:EPSG::6136' => [
            'name' => 'St. Lawrence Island',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - Alaska - St. Lawrence Island',
            'help' => '
Many Alaskan islands were never on NAD27 but rather on independent datums. NADCON conversion program provides transformation from St. Lawrence Island Datum to NAD83 (original 1986 realization) - making the transformation appear to user as if from NAD27.',
        ],
        'urn:ogc:def:datum:EPSG::6137' => [
            'name' => 'St. Paul Island',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - Alaska - St. Paul Island',
            'help' => 'Fundamental point latitude: 57°07\'16.86"N, longitude: 170°16\'24.00"W (of Greenwich).
Many Alaskan islands were never on NAD27 but rather on independent datums. NADCON conversion program provides transformation from St. Paul Island Datum to NAD83 (original 1986 realization) - making the transformation appear to user as if from NAD27.',
        ],
        'urn:ogc:def:datum:EPSG::6138' => [
            'name' => 'St. George Island',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - Alaska - St. George Island',
            'help' => 'Fundamental point latitude: 56°36\'11.31"N, longitude: 169°32\'36.00"W (of Greenwich).
Many Alaskan islands were never on NAD27 but rather on independent datums. NADCON conversion program provides transformation from St. George Island Datum to NAD83 (original 1986 realization) - making the transformation appear to user as if from NAD27.',
        ],
        'urn:ogc:def:datum:EPSG::6139' => [
            'name' => 'Puerto Rico',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Caribbean - Puerto Rico and Virgin Islands - onshore',
            'help' => 'Fundamental point: Cardona Island Lighthouse. Latitude:17°57\'31.40"N, longitude: 66°38\'07.53"W (of Greenwich).
NADCON conversion program provides transformation from Puerto Rico Datum to NAD83 (original 1986 realization) but making the transformation appear to user as if from NAD27.',
        ],
        'urn:ogc:def:datum:EPSG::6140' => [
            'name' => 'NAD83 Canadian Spatial Reference System',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Canada',
            'help' => '
Includes all versions of NAD83(CSRS) from v2 [CSRS98] onwards without specific identification. As such it has an accuracy of approximately 1m.',
        ],
        'urn:ogc:def:datum:EPSG::6141' => [
            'name' => 'Israel 1993',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East - Israel and Palestine Territory onshore',
            'help' => 'Fundamental point:  Latitude: 31°44\'03.817"N, longitude: 35°12\'16.261"E (of Greenwich).
Replaces Palestine 1923 (datum code 6281). Replaced by IGD05 (datum code 1143).',
        ],
        'urn:ogc:def:datum:EPSG::6142' => [
            'name' => 'Locodjo 1965',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cote d\'Ivoire (Ivory Coast)',
            'help' => 'Fundamental point: T5 Banco. Latitude: 5°18\'50.5"N, longitude: 4°02\'05.1"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6143' => [
            'name' => 'Abidjan 1987',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cote d\'Ivoire (Ivory Coast)',
            'help' => 'Fundamental point: Abidjan I. Latitude: 5°18\'51.01"N, longitude: 4°02\'06.04"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6144' => [
            'name' => 'Kalianpur 1937',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7015',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Bangladesh; India; Myanmar; Pakistan - onshore',
            'help' => 'Fundamental point: Kalianpur. Latitude: 24° 07\'11.260"N, longitude: 77°39\'17.570"E (of Greenwich).
Replaces 1880 adjustment except for topographic mapping. Replaced in Bangladesh and Pakistan by 1962 metrication conversion and in India by 1975 metrication conversion.',
        ],
        'urn:ogc:def:datum:EPSG::6145' => [
            'name' => 'Kalianpur 1962',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7044',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Pakistan',
            'help' => 'Fundamental point: Kalianpur. Latitude: 24° 07\'11.260"N, longitude: 77°39\'17.570"E (of Greenwich).
1937 adjustment rescaled by ratio metric conversions of Indian foot (1937) to Indian foot (1962).',
        ],
        'urn:ogc:def:datum:EPSG::6146' => [
            'name' => 'Kalianpur 1975',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7045',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'India - mainland',
            'help' => 'Fundamental point: Kalianpur. Latitude: 24° 07\'11.260"N, longitude: 77°39\'17.570"E (of Greenwich).
1937 adjustment rescaled by ratio metric conversions of Indian foot (1937) to Indian foot (1975).',
        ],
        'urn:ogc:def:datum:EPSG::6147' => [
            'name' => 'Hanoi 1972',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Vietnam - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6148' => [
            'name' => 'Hartebeesthoek94',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - South Africa, Lesotho and Eswatini',
            'help' => 'Coincident with ITRF91 at epoch 1994.0 at Hartebeesthoek astronomical observatory near Pretoria.
Replaces Cape datum (code 6222).',
        ],
        'urn:ogc:def:datum:EPSG::6149' => [
            'name' => 'CH1903',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Liechtenstein and Switzerland',
            'help' => 'Fundamental point: Old Bern observatory. Latitude: 46°57\'08.660"N, longitude: 7°26\'22.500"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6150' => [
            'name' => 'CH1903+',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Liechtenstein and Switzerland',
            'help' => 'Fundamental point: Zimmerwald observatory.
',
        ],
        'urn:ogc:def:datum:EPSG::6151' => [
            'name' => 'Swiss Terrestrial Reference System 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Liechtenstein and Switzerland',
            'help' => 'ETRF89 at epoch 1993.0.
First realized through CHTRF95 and subsequently CHTRF98, 2004, 2010 and 2016 with an aim to re-measure every 6 years.',
        ],
        'urn:ogc:def:datum:EPSG::6152' => [
            'name' => 'NAD83 (High Accuracy Reference Network)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - HARN',
            'help' => 'A collection of individual state-wide adjustments including GPS observations made between 1991 and 1996.
In CONUS, American Samoa and Guam replaced by NAD83(FBN). In Alaska replaced by NAD83(NSRS2007). In Hawaii replaced by NAD83(PA11). In Puerto Rico and US Virgin Islands replaced by NAD83(HARN Corrected).',
        ],
        'urn:ogc:def:datum:EPSG::6153' => [
            'name' => 'Rassadiran',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iran - Taheri refinery',
            'help' => 'Fundamental point: Total1. Latitude: 27°31\'07.784"N, longitude: 52°36\'12.741"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6154' => [
            'name' => 'European Datum 1950(1977)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iran',
            'help' => 'Extension of ED50 over Iran.
Sometimes referred to as ED50-ED77.',
        ],
        'urn:ogc:def:datum:EPSG::6155' => [
            'name' => 'Dabola 1981',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guinea - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6156' => [
            'name' => 'System of the Unified Trigonometrical Cadastral Network',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Czechoslovakia',
            'help' => 'Modification of Austrian MGI datum, code 6312.
',
        ],
        'urn:ogc:def:datum:EPSG::6157' => [
            'name' => 'Mount Dillon',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7007',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Trinidad and Tobago - Tobago - onshore',
            'help' => 'Fundamental point: Mount Dillon triangulation station. Latitude: 11°15\'07.843"N, longitude: 60°41\'09.632"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6158' => [
            'name' => 'Naparima 1955',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Trinidad and Tobago - Trinidad - onshore',
            'help' => 'Fundamental point: Naparima. Latitude: 10°16\'44.860"N, longitude: 61°27\'34.620"W (of Greenwich).
Extended to Tobago as Naparima 1972. (Note: Naparima 1972 is not used in Trinidad).',
        ],
        'urn:ogc:def:datum:EPSG::6159' => [
            'name' => 'European Libyan Datum 1979',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Libya',
            'help' => 'Extension of ED50 over Libya.
',
        ],
        'urn:ogc:def:datum:EPSG::6160' => [
            'name' => 'Chos Malal 1914',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina - Mendoza and Neuquen',
            'help' => 'Chos Malal police station.
Also known as Quini-Huao. Replaced by Campo Inchauspe (code 6221) for topographic mapping, use for oil exploration and production continues.',
        ],
        'urn:ogc:def:datum:EPSG::6161' => [
            'name' => 'Pampa del Castillo',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina - 42.5°S to 50.3°S',
            'help' => '
Replaced by Campo Inchauspe (code 6221) for topographic mapping, use for oil exploration and production in Golfo San Jorge basin (44°S to 47.5°S) continues.',
        ],
        'urn:ogc:def:datum:EPSG::6162' => [
            'name' => 'Korean Datum 1985',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Korea, Republic of (South Korea) - onshore',
            'help' => 'Fundamental point: Suwon. Latitude 37°16\'31.9034"N, longitude 127°03\'05.1451"E of Greenwich. This is consistent with the Tokyo 1918 datum latitude and longitude.
Replaces Tokyo 1918 (datum code 6301). Replaced by KGD2002 (datum code 6737).',
        ],
        'urn:ogc:def:datum:EPSG::6163' => [
            'name' => 'Yemen National Geodetic Network 1996',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Yemen',
            'help' => 'Sana\'a IGN reference marker.
',
        ],
        'urn:ogc:def:datum:EPSG::6164' => [
            'name' => 'South Yemen',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Yemen - South Yemen - mainland',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6165' => [
            'name' => 'Bissau',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guinea-Bissau - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6166' => [
            'name' => 'Korean Datum 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Korea, Republic of (South Korea) - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6167' => [
            'name' => 'New Zealand Geodetic Datum 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand',
            'help' => 'Based on ITRF96 at epoch 2000.0
Replaces New Zealand Geodetic Datum 1949 (code 6272) and Chatham Islands Datum 1979 (code 6673) from March 2000.',
        ],
        'urn:ogc:def:datum:EPSG::6168' => [
            'name' => 'Accra',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7029',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Ghana',
            'help' => 'Fundamental point: GCS Station 547. Latitude: 5°23\'43.3"N, longitude: 0°11\'52.3"W (of Greenwich).
Replaced in 1978 by Leigon datum (code 6250).',
        ],
        'urn:ogc:def:datum:EPSG::6169' => [
            'name' => 'American Samoa 1962',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'American Samoa - 2 main island groups',
            'help' => 'Fundamental point: Betty 13 eccentric. Latitude: 14°20\'08.34"S, longitude: 170°42\'52.25"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6170' => [
            'name' => 'Sistema de Referencia Geocentrico para America del Sur 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'South America - SIRGAS 1995 by country',
            'help' => 'ITRF94 at epoch 1995.4.
Realized by a frame of 58 stations observed in 1995 and adjusted in ITRF94. Provisional NIMA adjustment reference epoch was 1995.42 but final report accepted value is 1995.40. Replaced by SIRGAS 2000.',
        ],
        'urn:ogc:def:datum:EPSG::6171' => [
            'name' => 'Reseau Geodesique Francais 1993 v1',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France',
            'help' => 'Coincident with ETRS89 at epoch 1993.0. Derived from long-term GNSS observations at 23 points aligned to ETRF93 @ 1993.0 through fundamental points at Grasse, Toulouse and Brest. Network supplemented in 1994 and 1995 by approx. 1000 additional stations.
RGF93 v1 is a realization of ETRS89. Replaced by RGF93 v2 (datum code 1312) from 2010-06-18.',
        ],
        'urn:ogc:def:datum:EPSG::6173' => [
            'name' => 'IRENET95',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Ireland (Republic and Ulster) - onshore',
            'help' => 'ETRS89 stations in Ireland
Densification of ETRS89',
        ],
        'urn:ogc:def:datum:EPSG::6174' => [
            'name' => 'Sierra Leone Colony 1924',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7029',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sierra Leone - Freetown Peninsula',
            'help' => 'Fundamental point: Kortright. Latitude: 8°28\'44.4"N, longitude: 13°13\'03.81"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6175' => [
            'name' => 'Sierra Leone 1968',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sierra Leone - onshore',
            'help' => 'Fundamental point: SLX2 Astro. Latitude: 8°27\'17.567"N, longitude: 12°49\'40.186"W (of Greenwich).
Extension and readjustment with additional observations of 1960 network. Coordinates of 1960 stations change by less than 3 metres.',
        ],
        'urn:ogc:def:datum:EPSG::6176' => [
            'name' => 'Australian Antarctic Datum 1998',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Antarctica - Australian sector',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6178' => [
            'name' => 'Pulkovo 1942(83)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - onshore - eastern - S-42(83)',
            'help' => 'Fundamental point: Pulkovo observatory. Latitude: 59°46\'18.550"N, longitude: 30°19\'42.090"E (of Greenwich).
1983 international adjustment of Uniform Astro-Geodetic Network of countries of central and eastern Europe.',
        ],
        'urn:ogc:def:datum:EPSG::6179' => [
            'name' => 'Pulkovo 1942(58)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - onshore - eastern - S-42(58)',
            'help' => 'Fundamental point: Pulkovo observatory. Latitude: 59°46\'18.550"N, longitude: 30°19\'42.090"E (of Greenwich).
1956 international adjustment of Uniform Astro-Geodetic Network of countries of central and eastern Europe. Locally densified during 1957 and 1958.',
        ],
        'urn:ogc:def:datum:EPSG::6180' => [
            'name' => 'Estonia 1997',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Estonia',
            'help' => 'Densification of ETRS89 during EUREF-ESTONIA97 campaign through transformation from ITRF96 at epoch 1997.56.
Replaces Estonia 1992 adjustment (code 6133).',
        ],
        'urn:ogc:def:datum:EPSG::6181' => [
            'name' => 'Luxembourg Reference Frame',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Luxembourg',
            'help' => 'Fundamental point of 1930 triangulation: northern station of Habay-la-Neuve baseline in Belgium. Latitude: 49°43\'24.408"N, longitude: 5°38\'22.470"E (of Greenwich). Since 2006 LUREF has been realized by GNSS station positions and transformation from ETRF.
The transformation from ETRF 2000 first defining LUREF in 2006 has been recomputed in 2014 and 2020.',
        ],
        'urn:ogc:def:datum:EPSG::6182' => [
            'name' => 'Azores Occidental Islands 1939',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores W - onshore',
            'help' => 'Fundamental point: Observatario Meteorologico Flores.
',
        ],
        'urn:ogc:def:datum:EPSG::6183' => [
            'name' => 'Azores Central Islands 1948',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores C - onshore',
            'help' => 'Fundamental point: Graciosa south west base. Latitude: 39°03\'54.934"N, longitude: 28°02\'23.882"W (of Greenwich).
Replaced by 1995 adjustment (datum code 6665).',
        ],
        'urn:ogc:def:datum:EPSG::6184' => [
            'name' => 'Azores Oriental Islands 1940',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores E - onshore',
            'help' => 'Fundamental point: Forte de São Bras.
Replaced by 1995 adjustment (datum code 6664).',
        ],
        'urn:ogc:def:datum:EPSG::6188' => [
            'name' => 'OSNI 1952',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7001',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Northern Ireland - onshore',
            'help' => 'Position fixed to the coordinates from the 19th century Principle Triangulation of station Divis. Scale and orientation controlled by position of Principle Triangulation stations Knocklayd and Trostan.
Replaced by Geodetic Datum of 1965 alias 1975 Mapping Adjustment or TM75 (datum code 6300).',
        ],
        'urn:ogc:def:datum:EPSG::6189' => [
            'name' => 'Red Geodesica Venezolana',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Venezuela',
            'help' => 'Realised by a frame of 67 stations observed in 1995 as a densification of the SIRGAS campaign and adjusted in the ITRF94 at epoch 1995.4.
',
        ],
        'urn:ogc:def:datum:EPSG::6190' => [
            'name' => 'Posiciones Geodesicas Argentinas 1998',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina',
            'help' => 'A geodetic network of 136 high accuracy surveyed points. Densification of SIRGAS 1995; ITRF94 at epoch 1995.4.
Replaced POSGAR 1994 (datum code 6694) for technical, but not legal, purposes. Replaced by POSGAR 2007 (datum code 1062) from May 2009.',
        ],
        'urn:ogc:def:datum:EPSG::6191' => [
            'name' => 'Albanian 1987',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Albania - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6192' => [
            'name' => 'Douala 1948',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cameroon - coastal area',
            'help' => 'South pillar of Douala base; 4°00\'40.64"N, 9°42\'30.41"E (of Greenwich).
Replaced by Manoca 1962 datum (code 6193).',
        ],
        'urn:ogc:def:datum:EPSG::6193' => [
            'name' => 'Manoca 1962',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cameroon - coastal area',
            'help' => 'Reservoir centre at the  Manoca tower ("tube Suel"), 3°51\'49.896"N, 9°36\'49.347"E (of Greenwich).
The intent of the Bukavu 1953 conference was to adopt the Clarke 1880 (RGS) ellipsoid (code 7012) but in practice this datum has used the IGN version. Replaces Douala 1948 (code 6192).',
        ],
        'urn:ogc:def:datum:EPSG::6194' => [
            'name' => 'Qornoq 1927',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greenland - west coast',
            'help' => 'Fundamental point: Station 7008. Latitude: 64°31\'06.27"N, longitude: 51°12\'24.86"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6195' => [
            'name' => 'Scoresbysund 1952',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greenland - Scoresbysund area',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6196' => [
            'name' => 'Ammassalik 1958',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greenland - Ammassalik area',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6197' => [
            'name' => 'Garoua',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cameroon - Garoua area',
            'help' => 'Fundamental point: IGN astronomical station and benchmark no. 16 at Tongo. Latitude 8°55\'08.74"N, longitude 13°30\'43.19"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6198' => [
            'name' => 'Kousseri',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cameroon - N\'Djamena area',
            'help' => 'IGN astronomical station Dabanga; 11°55\'05.9"N  14°38\'40.8"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6199' => [
            'name' => 'Egypt 1930',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Egypt - onshore',
            'help' => 'Fundamental point: Station F1 (Venus). Latitude: 30°01\'42.86"N, longitude: 31°16\'37.05"E (of Greenwich).
Note that Egypt 1930 uses the International 1924 ellipsoid, unlike the Egypt 1907 datum (code 6229) which uses the Helmert ellipsoid. Oil industry references to the Egypt 1930 datum name and the Helmert ellipsoid probably mean Egypt 1907 datum.',
        ],
        'urn:ogc:def:datum:EPSG::6200' => [
            'name' => 'Pulkovo 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Russia',
            'help' => 'Fundamental point: Pulkovo observatory. Latitude: 59°46\'15.359"N, longitude: 30°19\'28.318"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6201' => [
            'name' => 'Adindan',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - Eritrea, Ethiopia, South Sudan and Sudan',
            'help' => 'Fundamental point: Station 15; Adindan. Latitude: 22°10\'07.110"N, longitude: 31°29\'21.608"E (of Greenwich).
The 12th parallel traverse of 1966-70 (Point 58 datum, code 6620) is connected to the Blue Nile 1958 network in western Sudan. This has given rise to misconceptions that the Blue Nile network is used in west Africa.',
        ],
        'urn:ogc:def:datum:EPSG::6202' => [
            'name' => 'Australian Geodetic Datum 1966',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7003',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Australasia - Australia and PNG - AGD66',
            'help' => 'Fundamental point: Johnson Memorial Cairn. Latitude: 25°56\'54.5515"S, longitude: 133°12\'30.0771"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6203' => [
            'name' => 'Australian Geodetic Datum 1984',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7003',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Australia - AGD84',
            'help' => 'Fundamental point: Johnson Memorial Cairn. Latitude: 25°56\'54.5515"S, longitude: 133°12\'30.0771"E (of Greenwich).
Uses all data from 1966 adjustment with additional observations, improved software and a geoid model.',
        ],
        'urn:ogc:def:datum:EPSG::6204' => [
            'name' => 'Ain el Abd 1970',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East - Bahrain, Kuwait and Saudi Arabia',
            'help' => 'Fundamental point: Ain El Abd.  Latitude: 28°14\'06.171"N, longitude: 48°16\'20.906"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6205' => [
            'name' => 'Afgooye',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Somalia - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6206' => [
            'name' => 'Agadez',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Niger',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6207' => [
            'name' => 'Lisbon 1937',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - mainland - onshore',
            'help' => 'Fundamental point: Castelo Sao Jorge, Lisbon. Latitude: 38°42\'43.631"N, longitude: 9°07\'54.862"W (of Greenwich).
Replaces Lisbon 1890 adjustment (which used Bessel 1841 ellipsoid).',
        ],
        'urn:ogc:def:datum:EPSG::6208' => [
            'name' => 'Aratu',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Brazil - Aratu',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6209' => [
            'name' => 'Arc 1950',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7013',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - Botswana, Malawi, Zambia, Zimbabwe',
            'help' => 'Fundamental point: Buffelsfontein. Latitude: 33°59\'32.000"S, longitude: 25°30\'44.622"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6210' => [
            'name' => 'Arc 1960',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - Burundi, Kenya, Rwanda, Tanzania and Uganda',
            'help' => 'Fundamental point: Buffelsfontein. Latitude: 33°59\'32.000"S, longitude: 25°30\'44.622"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6211' => [
            'name' => 'Batavia',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia - Java, Java Sea and western Sumatra',
            'help' => 'Fundamental point: Longitude at Batavia Astro. Station. Latitude: 6°07\'39.522"S, longitude: 106°48\'27.790"E (of Greenwich). Latitude and azimuth at Genuk.
',
        ],
        'urn:ogc:def:datum:EPSG::6212' => [
            'name' => 'Barbados 1938',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Barbados - onshore',
            'help' => 'Fundamental point: HMS Challenger astro station M1, St. Anne\'s Tower. Latitude 13°04\'32.53"N, longitude 59°36\'29.34"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6213' => [
            'name' => 'Beduaram',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Niger - southeast',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6214' => [
            'name' => 'Beijing 1954',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China',
            'help' => 'Pulkovo, transferred through Russian triangulation.
Scale determined through three baselines in northeast China. Discontinuities at boundaries of adjustment blocks. From 1982 replaced by Xian 1980 and New Beijing.',
        ],
        'urn:ogc:def:datum:EPSG::6215' => [
            'name' => 'Reseau National Belge 1950',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Belgium - onshore',
            'help' => 'Fundamental point: Lommel (tower). Latitude: 51°13\'47.334"N, longitude: 5°18\'49.483"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6216' => [
            'name' => 'Bermuda 1957',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bermuda - onshore',
            'help' => 'Fundamental point: Fort George base. Latitude 32°22\'44.36"N, longitude 64°40\'58.11"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6218' => [
            'name' => 'Bogota 1975',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Colombia - mainland and offshore Caribbean',
            'help' => 'Fundamental point: Bogota observatory. Latitude: 4°35\'56.570"N, longitude: 74°04\'51.300"W (of Greenwich).
Replaces 1951 adjustment. Replaced by MAGNA-SIRGAS (datum code 6685).',
        ],
        'urn:ogc:def:datum:EPSG::6219' => [
            'name' => 'Bukit Rimpah',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia - Banga & Belitung Islands',
            'help' => '2°00\'40.16"S, 105°51\'39.76"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6220' => [
            'name' => 'Camacupa 1948',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Angola - Angola proper',
            'help' => 'Fundamental point: Campo de Aviaçao. Latitude: 12°01\'09.070"S, Longitude = 17°27\'19.800"E (of Greenwich).
Provisional adjustment, replaced in 2015 for onshore use by Camacupa 2015.',
        ],
        'urn:ogc:def:datum:EPSG::6221' => [
            'name' => 'Campo Inchauspe',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina - mainland onshore and offshore TdF',
            'help' => 'Fundamental point: Campo Inchauspe. Latitude: 35°58\'16.56"S, longitude: 62°10\'12.03"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6222' => [
            'name' => 'Cape',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7013',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - Botswana, Eswatini, Lesotho and South Africa',
            'help' => 'Fundamental point: Buffelsfontein. Latitude: 33°59\'32.000"S, longitude: 25°30\'44.622"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6223' => [
            'name' => 'Carthage',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Tunisia',
            'help' => 'Fundamental point: Carthage. Latitude: 40.9464506g = 36°51\'06.50"N, longitude: 8.8724368g E of Paris = 10°19\'20.72"E (of Greenwich).
Fundamental point astronomic coordinates determined in 1878.',
        ],
        'urn:ogc:def:datum:EPSG::6224' => [
            'name' => 'Chua',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'South America - Brazil - south of 18°S and west of 54°W + DF; N Paraguay',
            'help' => 'Fundamental point: Chua. Latitude: 19°45\'41.160"S, longitude: 48°06\'07.560"W (of Greenwich).
The Chua origin and associated network is in Brazil with a connecting traverse through northern Paraguay. It was used in Brazil only as input into the Corrego Allegre adjustment and for government work in Distrito Federal.',
        ],
        'urn:ogc:def:datum:EPSG::6225' => [
            'name' => 'Corrego Alegre 1970-72',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Brazil - Corrego Alegre 1970-1972',
            'help' => 'Fundamental point: Corrego Alegre. Latitude: 19°50\'14.91"S, longitude: 48°57\'41.98"W (of Greenwich).
Replaces 1961 adjustment (datum code 1074). Superseded by SAD69. NIMA gives coordinates of origin as latitude: 19°50\'15.14"S, longitude: 48°57\'42.75"W; these may refer to 1961 adjustment.',
        ],
        'urn:ogc:def:datum:EPSG::6227' => [
            'name' => 'Deir ez Zor',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East - Lebanon and Syria onshore',
            'help' => 'Fundamental point: Trig. 254 Deir. Latitude: 35°21\'49.975"N, longitude: 40°05\'46.770"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6229' => [
            'name' => 'Egypt 1907',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7020',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Egypt',
            'help' => 'Fundamental point: Station F1 (Venus). Latitude: 30°01\'42.86"N, longitude: 31°16\'33.60"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6230' => [
            'name' => 'European Datum 1950',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ED50 by country',
            'help' => 'Fundamental point: Potsdam (Helmert Tower). Latitude: 52°22\'51.4456"N, longitude: 13°03\'58.9283"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6231' => [
            'name' => 'European Datum 1987',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - west',
            'help' => 'Fundamental point: Potsdam (Helmert Tower). Latitude: 52°22\'51.4456"N, longitude: 13°03\'58.9283"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6232' => [
            'name' => 'Fahud',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Oman - mainland',
            'help' => 'Fundamental point: Station NO68-024 Fahud. Latitude: 22°17\'31.182"N, longitude: 56°29\'18.820"E (of Greenwich).
Replaced by PSD93 (code 6134).',
        ],
        'urn:ogc:def:datum:EPSG::6236' => [
            'name' => 'Hu Tzu Shan 1950',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Taiwan - onshore - mainland and Penghu',
            'help' => 'Fundamental point: Hu Tzu Shan. Latitude: 23°58\'32.34"N, longitude: 120°58\'25.975"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6237' => [
            'name' => 'Hungarian Datum 1972',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7036',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Hungary',
            'help' => 'Fundamental point: Szolohegy. Latitude: 47°17\'32,6156"N, longitude 19°36\'09.9865"E (of Greenwich); geoid height 6.56m.
Replaced Hungarian Datum 1909 (EPSG datum code 1024).',
        ],
        'urn:ogc:def:datum:EPSG::6238' => [
            'name' => 'Indonesian Datum 1974',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7021',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia - onshore',
            'help' => 'Fundamental point: Padang. Latitude: 0°56\'38.414"S, longitude: 100°22\' 8.804"E (of Greenwich). Ellipsoidal height 3.190m, gravity-related height 14.0m above mean sea level.
Replaced by DGN95.',
        ],
        'urn:ogc:def:datum:EPSG::6239' => [
            'name' => 'Indian 1954',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7015',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Myanmar and Thailand onshore',
            'help' => 'Extension of Kalianpur 1937 over Myanmar and Thailand.
',
        ],
        'urn:ogc:def:datum:EPSG::6240' => [
            'name' => 'Indian 1975',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7015',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Thailand - onshore and Gulf of Thailand',
            'help' => 'Fundamental point: Khau Sakaerang.
',
        ],
        'urn:ogc:def:datum:EPSG::6241' => [
            'name' => 'Jamaica 1875',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7034',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Jamaica - onshore',
            'help' => 'Fundamental point: Fort Charles Flagstaff. Latitude: 17°55\'55.800"N, longitude: 76°56\'37.260"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6242' => [
            'name' => 'Jamaica 1969',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Jamaica - onshore',
            'help' => 'Fundamental point: Fort Charles Flagstaff. Latitude: 17°55\'55.800"N, longitude: 76°56\'37.260"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6243' => [
            'name' => 'Kalianpur 1880',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7042',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Bangladesh; India; Myanmar; Pakistan - onshore',
            'help' => 'Fundamental point: Kalianpur. Latitude: 24°07\'11.260"N, longitude: 77°39\'17.570"E (of Greenwich).
Includes 1916 extension into Burma (Myanmar). Replaced by 1937 adjustment.',
        ],
        'urn:ogc:def:datum:EPSG::6244' => [
            'name' => 'Kandawala',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7015',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sri Lanka - onshore',
            'help' => 'Fundamental point: Kandawala. Latitude: 7°14\'06.838"N, longitude: 79°52\'36.670"E.
',
        ],
        'urn:ogc:def:datum:EPSG::6245' => [
            'name' => 'Kertau 1968',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7018',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Malaysia (west including SCS) and Singapore',
            'help' => 'Fundamental point: Kertau. Latitude: 3°27\'50.710"N, longitude: 102°37\'24.550"E (of Greenwich).
Replaces MRT48 and earlier adjustments. Adopts metric conversion of 39.370113 inches per metre. Not used for 1969 metrication of RSO grid - see Kertau (RSO) (code 6751).',
        ],
        'urn:ogc:def:datum:EPSG::6246' => [
            'name' => 'Kuwait Oil Company',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Kuwait - onshore',
            'help' => 'Fundamental point: K28.  Latitude: 29°03\'42.348"N, longitude: 48°08\'42.558"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6247' => [
            'name' => 'La Canoa',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Venezuela - onshore',
            'help' => 'Fundamental point: La Canoa. Latitude: 8°34\'17.170"N, longitude: 63°51\'34.880"W (of Greenwich).
Origin and network incorporated within PSAD56 (datum code 6248).',
        ],
        'urn:ogc:def:datum:EPSG::6248' => [
            'name' => 'Provisional South American Datum 1956',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'South America - PSAD56 by country',
            'help' => 'Fundamental point: La Canoa. Latitude: 8°34\'17.170"N, longitude: 63°51\'34.880"W (of Greenwich).
Same origin as La Canoa datum.',
        ],
        'urn:ogc:def:datum:EPSG::6249' => [
            'name' => 'Lake',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Venezuela - Lake Maracaibo',
            'help' => 'Fundamental point: Maracaibo Cathedral. Latitude: 10°38\'34.678"N, longitude: 71°36\'20.224"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6250' => [
            'name' => 'Leigon',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Ghana',
            'help' => 'Fundamental point: GCS Station 121, Leigon. Latitude: 5°38\'52.27"N, longitude: 0°11\'46.08"W (of Greenwich).
Replaced Accra datum (code 6168) from 1978. Coordinates at Leigon fundamental point defined as Accra datum values for that point.',
        ],
        'urn:ogc:def:datum:EPSG::6251' => [
            'name' => 'Liberia 1964',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Liberia - onshore',
            'help' => 'Fundamental point: Robertsfield. Latitude: 6°13\'53.02"N, longitude: 10°21\'35.44"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6252' => [
            'name' => 'Lome',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Togo',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6253' => [
            'name' => 'Luzon 1911',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Philippines - onshore',
            'help' => 'Fundamental point: Balacan. Latitude: 13°33\'41.000"N, longitude: 121°52\'03.000"E (of Greenwich).
Replaced by Philippine Reference system of 1992 (datum code 6683).',
        ],
        'urn:ogc:def:datum:EPSG::6254' => [
            'name' => 'Hito XVIII 1963',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'South America - Tierra del Fuego',
            'help' => 'Chile-Argentina boundary survey.
Used in Tierra del Fuego.',
        ],
        'urn:ogc:def:datum:EPSG::6255' => [
            'name' => 'Herat North',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Afghanistan',
            'help' => 'Fundamental point: Herat North. Latitude: 34°23\'09.08"N, longitude: 64°10\'58.94"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6256' => [
            'name' => 'Mahe 1971',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Seychelles - Mahe Island',
            'help' => 'Fundamental point: Station SITE. Latitude: 4°40\'14.644"S, longitude: 55°28\'44.488"E (of Greenwich).
South East Island 1943 (datum code 1138) used for topographic mapping, cadastral and hydrographic survey.',
        ],
        'urn:ogc:def:datum:EPSG::6257' => [
            'name' => 'Makassar',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia - Sulawesi SW',
            'help' => 'Fundamental point: station P1, Moncongloe. Latitude: 5°08\'41.42"S, long 119°24\'14.94"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6258' => [
            'name' => 'European Terrestrial Reference System 1989 ensemble',
            'type' => 'ensemble',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - ETRF by country',
            'ensemble' => [
                'urn:ogc:def:datum:EPSG::1178',
                'urn:ogc:def:datum:EPSG::1179',
                'urn:ogc:def:datum:EPSG::1180',
                'urn:ogc:def:datum:EPSG::1181',
                'urn:ogc:def:datum:EPSG::1182',
                'urn:ogc:def:datum:EPSG::1183',
                'urn:ogc:def:datum:EPSG::1184',
                'urn:ogc:def:datum:EPSG::1185',
                'urn:ogc:def:datum:EPSG::1186',
                'urn:ogc:def:datum:EPSG::1204',
                'urn:ogc:def:datum:EPSG::1206',
                'urn:ogc:def:datum:EPSG::1382',
            ],
            'help' => '
Has been realized through ETRF89, ETRF90, ETRF91, ETRF92, ETRF93, ETRF94, ETRF96, ETRF97, ETRF2000, ETRF2005, ETRF2014 and ETRF2020. This \'ensemble\' covers any or all of these realizations without distinction.',
        ],
        'urn:ogc:def:datum:EPSG::6259' => [
            'name' => 'Malongo 1987',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - Angola (Cabinda) and DR Congo (Zaire) - offshore',
            'help' => 'Fundamental point: Station Y at Malongo base camp. Latitude: 5°23\'30.810"S, longitude: 12°12\'01.590"E (of Greenwich).
Replaced Mhast (offshore) (code 6705) in 1987. Origin coordinates constrained to those of Mhast (offshore) but other station coordinates differ. References to "Mhast" since 1987 often should have stated "Malongo 1987".',
        ],
        'urn:ogc:def:datum:EPSG::6261' => [
            'name' => 'Merchich',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - Morocco and Western Sahara - onshore',
            'help' => 'Fundamental point: Merchich. Latitude: 33°26\'59.672"N, longitude: 7°33\'27.295"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6262' => [
            'name' => 'Massawa',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Eritrea',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6263' => [
            'name' => 'Minna',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Nigeria',
            'help' => 'Fundamental point: Minna base station L40. Latitude: 9°38\'08.87"N, longitude: 6°30\'58.76"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6265' => [
            'name' => 'Monte Mario',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Italy - including San Marino and Vatican',
            'help' => 'Fundamental point: Monte Mario. Latitude: 41°55\'25.51"N, longitude: 12°27\'08.4"E (of Greenwich).
Replaced Genova datum, Bessel 1841 ellipsoid, from 1940.',
        ],
        'urn:ogc:def:datum:EPSG::6266' => [
            'name' => 'M\'poraloko',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Gabon',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6267' => [
            'name' => 'North American Datum 1927',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'North America - NAD27',
            'help' => 'Fundamental point: Meade\'s Ranch. Latitude: 39°13\'26.686"N, longitude: 98°32\'30.506"W (of Greenwich).
In United States (USA) and Canada, replaced by North American Datum 1983 (NAD83) (code 6269) ; in Mexico, replaced by Mexican Datum of 1993 (code 1042).',
        ],
        'urn:ogc:def:datum:EPSG::6269' => [
            'name' => 'North American Datum 1983',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'North America - NAD83',
            'help' => 'NAD83 Doppler Transit stations in NWL 9D were aligned with the BIH Conventional Terrestrial Reference Frame (BTS) at epoch 1984.0 using an internationally adopted transformation. NAD83 is now known to be non-geocentric by about 2.2 meters.
Although the 1986 adjustment included connections to Greenland and Mexico, it has not been adopted there. In Canada and US, replaced NAD27.',
        ],
        'urn:ogc:def:datum:EPSG::6270' => [
            'name' => 'Nahrwan 1967',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East - Qatar offshore and UAE',
            'help' => 'Fundamental point: Nahrwan south base.  Latitude: 33°19\'10.87"N, longitude: 44°43\'25.54"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6271' => [
            'name' => 'Naparima 1972',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Trinidad and Tobago - Tobago - onshore',
            'help' => 'Fundamental point: Naparima. Latitude: 10°16\'44.860"N, longitude: 61°27\'34.620"W (of Greenwich).
Naparima 1972 is an extension to Tobago of the Naparima 1955 network of Trinidad.',
        ],
        'urn:ogc:def:datum:EPSG::6272' => [
            'name' => 'New Zealand Geodetic Datum 1949',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - onshore and nearshore',
            'help' => 'Fundamental point: Papatahi. Latitude: 41°19\' 8.900"S, longitude: 175°02\'51.000"E (of Greenwich).
Replaced by New Zealand Geodetic Datum 2000 (code 6167) from March 2000.',
        ],
        'urn:ogc:def:datum:EPSG::6273' => [
            'name' => 'NGO 1948',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7005',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Norway - onshore',
            'help' => 'Fundamental point: Oslo observatory. Latitude: 59°54\'43.7"N, longitude: 10°43\'22.5"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6274' => [
            'name' => 'Datum 73',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - mainland - onshore',
            'help' => 'Fundamental point:  TF4, Melrica. Latitude: 39°41\'37.30"N, longitude: 8°07\'53.31"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6275' => [
            'name' => 'Nouvelle Triangulation Francaise',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France - onshore - mainland and Corsica',
            'help' => 'Fundamental point: Pantheon. Latitude: 48°50\'46.522"N, longitude: 2°20\'48.667"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6276' => [
            'name' => 'NSWC 9Z-2',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7025',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Transit precise ephemeris before 1991.',
        ],
        'urn:ogc:def:datum:EPSG::6277' => [
            'name' => 'Ordnance Survey of Great Britain 1936',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7001',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Britain and UKCS 49°45\'N to 61°N, 9°W to 2°E',
            'help' => 'Prior to 2002 fundamental point: Herstmonceux, Latitude: 50°51\'55.271"N, longitude: 0°20\'45.882"E, triangulation adjustment started 1936, completed 1962. From April 2002 the datum is defined through the application of the OSTN transformation from ETRS89.
The average accuracy of OSTN compared to the old triangulation network (down to 3rd order) is 0.1m. With the introduction of OSTN15, the area for OGSB36 has effectively been extended from Britain to cover the adjacent UK Continental Shelf.',
        ],
        'urn:ogc:def:datum:EPSG::6278' => [
            'name' => 'OSGB 1970 (SN)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7001',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UK - Great Britain onshore and nearshore; Isle of Man',
            'help' => 'Fundamental point: Herstmonceux. Latitude: 50°51\'55.271"N, longitude: 0°20\'45.882"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6279' => [
            'name' => 'OS (SN) 1980',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7001',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - British Isles - UK and Ireland onshore',
            'help' => 'Fundamental point: Herstmonceux. Latitude: 50°51\'55.271"N, longitude: 0°20\'45.882"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6281' => [
            'name' => 'Palestine 1923',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7010',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East - Israel, Jordan and Palestine onshore',
            'help' => 'Fundamental point: Point 82\'M  Jerusalem. Latitude: 31°44\' 2.749"N, longitude: 35°12\'43.490"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6282' => [
            'name' => 'Congo 1960 Pointe Noire',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Congo',
            'help' => 'Fundamental point: Point Noire Astro. Latitude: 4°47\'00.10"S, longitude: 11°51\'01.55"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6283' => [
            'name' => 'Geocentric Datum of Australia 1994',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Australia - GDA',
            'help' => 'ITRF92 at epoch 1994.0.
',
        ],
        'urn:ogc:def:datum:EPSG::6284' => [
            'name' => 'Pulkovo 1942',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - FSU onshore',
            'help' => 'Fundamental point: Pulkovo observatory. Latitude: 59°46\'18.550"N, longitude: 30°19\'42.090"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6285' => [
            'name' => 'Qatar 1974',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Qatar',
            'help' => 'Fundamental point: Station G3.
',
        ],
        'urn:ogc:def:datum:EPSG::6286' => [
            'name' => 'Qatar 1948',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7020',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Qatar - onshore',
            'help' => 'Fundamental point: Sokey 0 M. Latitude: 25°22\'56.500"N, longitude: 50°45\'41.000"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6288' => [
            'name' => 'Loma Quintana',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Venezuela - north of 7°45\'N',
            'help' => 'Fundamental point: Loma Quintana.
Replaced by La Canoa (code 6247).',
        ],
        'urn:ogc:def:datum:EPSG::6289' => [
            'name' => 'Amersfoort',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Netherlands - onshore',
            'help' => 'Originally defined through fundamental point Amersfoort, latitude 52°09\'22.178"N, longitude 5°23\'15.478"E (of Greenwich). Since 2000-10-01 has been redefined as derived from ETRS89 by application of the official transformation RDNAPTRANS(TM).
',
        ],
        'urn:ogc:def:datum:EPSG::6292' => [
            'name' => 'Sapper Hill 1943',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Falkland Islands - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6293' => [
            'name' => 'Schwarzeck',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7046',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Namibia',
            'help' => 'Fundamental point: Schwarzeck. Latitude: 22°45\'35.820"S, longitude: 18°40\'34.549"E (of Greenwich). Fixed during German South West Africa-British Bechuanaland boundary survey of 1898-1903.
',
        ],
        'urn:ogc:def:datum:EPSG::6295' => [
            'name' => 'Serindung',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia - Kalimantan W - coastal',
            'help' => 'Fundamental point: Ep A. Latitude: 1°06\'10.60"N, longitude: 105°00\'59.82"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6297' => [
            'name' => 'Tananarive 1925',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Madagascar - onshore and nearshore',
            'help' => 'Fundamental point: Tananarive observatory. Latitude: 18°55\'02.10"S, longitude: 47°33\'06.75"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6298' => [
            'name' => 'Timbalai 1948',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7016',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Brunei and East Malaysia',
            'help' => 'Fundamental point: Station P85 at Timbalai. Latitude: 5°17\' 3.548"N, longitude: 115°10\'56.409"E (of Greenwich).
In 1968, the original adjustment was densified in Sarawak and extended to Sabah.',
        ],
        'urn:ogc:def:datum:EPSG::6299' => [
            'name' => 'TM65',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7002',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Ireland (Republic and Ulster) - onshore',
            'help' => 'Adjusted to best mean fit 12 stations of the OSNI 1952 primary adjustment.
Differences between OSNI 1952 and TM65 at these stations are RMS 0.25m east, 0.23m north, maximum vector 0.57m. TM65 replaced by and not to be confused with Geodetic Datum of 1965 alias 1975 Mapping Adjustment or TM75 (datum code 6300).',
        ],
        'urn:ogc:def:datum:EPSG::6300' => [
            'name' => 'Geodetic Datum of 1965',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7002',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Ireland (Republic and Ulster) - onshore',
            'help' => 'Adjusted to best mean fit 9 stations of the OSNI 1952 primary adjustment in Northern Ireland plus the 1965 values of 3 stations in the Republic of Ireland.
Differences from the 1965 adjustment (datum code 6299) are: average difference in Eastings 0.092m; average difference in Northings 0.108m; maximum vector difference 0.548m.',
        ],
        'urn:ogc:def:datum:EPSG::6301' => [
            'name' => 'Tokyo',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Japan and Korea',
            'help' => 'Fundamental point: Nikon-Keido-Genten. Latitude: 35°39\'17.5148"N, longitude: 139°44\'40.5020"E (of Greenwich). Longitude derived in 1918.
In Japan, replaces Tokyo 1892 (code 1048) and replaced by Japanese Geodetic Datum 2000 (code 6611). In Korea used only for geodetic applications before being replaced by Korean 1985 (code 6162).',
        ],
        'urn:ogc:def:datum:EPSG::6302' => [
            'name' => 'Trinidad 1903',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7007',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Trinidad and Tobago - Trinidad',
            'help' => 'Station 00, Harbour Master\'s Flagstaff, Port of Spain.
Trinidad 1903 / Trinidad Grid coordinates (Clarke\'s links): 333604.30 E, 436366.91 N (Latitude: 10°38\'39.01"N,  Longitude: 61°30\'38.00"W of Greenwich)
',
        ],
        'urn:ogc:def:datum:EPSG::6303' => [
            'name' => 'Trucial Coast 1948',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7020',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'UAE - Abu Dhabi and Dubai - onshore',
            'help' => 'Fundamental point: TC1. Latitude: 25°23\'50.190"N, longitude: 55°26\'43.950"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6304' => [
            'name' => 'Voirol 1875',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Algeria - north of 32°N',
            'help' => 'Fundamental point: Voirol. Latitude: 36°45\'07.927"N, longitude: 3°02\'49.435"E of Greenwich. Uses RGS (and old IGN) value of 2°20\'13.95"for Greenwich-Paris meridian difference.
Replaced by Voirol 1879 (code 6671).',
        ],
        'urn:ogc:def:datum:EPSG::6306' => [
            'name' => 'Bern 1938',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Liechtenstein and Switzerland',
            'help' => 'Fundamental point: Old Bern observatory. Latitude: 46°57\'07.890"N, longitude: 7°26\'22.335"E (of Greenwich).
This redetermination of the coordinates of fundamental point is used for scientific purposes and as the graticule overprinted on topographic maps constructed on the CH1903 / LV03 projected CS (code 21781).',
        ],
        'urn:ogc:def:datum:EPSG::6307' => [
            'name' => 'Nord Sahara 1959',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Algeria',
            'help' => 'Coordinates of primary network readjusted on ED50 datum and then transformed conformally to Clarke 1880 (RGS) ellipsoid.
Adjustment includes Morocco and Tunisia but use only in Algeria. Within Algeria the adjustment is north of 32°N but use has been extended southwards in many disconnected projects, some based on independent astro stations rather than the geodetic network.',
        ],
        'urn:ogc:def:datum:EPSG::6308' => [
            'name' => 'Stockholm 1938',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sweden - onshore',
            'help' => 'Fundamental point: Stockholm observatory.
Replaced by RT90 adjustment (datum code 6124)',
        ],
        'urn:ogc:def:datum:EPSG::6309' => [
            'name' => 'Yacare',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Uruguay - onshore',
            'help' => 'Fundamental point: Yacare. Latitude: 30°35\'53.68"S, longitude: 57°25\'01.30"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6310' => [
            'name' => 'Yoff',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Senegal',
            'help' => 'Fundamental point: Yoff. Latitude: 14°44\'41.62"N, longitude: 17°29\'07.02"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6311' => [
            'name' => 'Zanderij',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Suriname',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6312' => [
            'name' => 'Militar-Geographische Institut',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Austria',
            'help' => 'Fundamental point: Hermannskogel. Latitude: 48°16\'15.29"N, longitude: 16°17\'41.06"E (of Greenwich).
The longitude of the datum origin equates to a value for the Ferro meridian of 17°40\' exactly west of Greenwich.',
        ],
        'urn:ogc:def:datum:EPSG::6313' => [
            'name' => 'Reseau National Belge 1972',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Belgium - onshore',
            'help' => 'Fundamental point: Uccle observatory. Latitude: 50°47\'57.704"N, longitude: 4°21\'24.983"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6314' => [
            'name' => 'Deutsches Hauptdreiecksnetz',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - West Germany all states',
            'help' => 'Fundamental point: Rauenberg. Latitude: 52°27\'12.021"N, longitude: 13°22\'04.928"E (of Greenwich).  This station was destroyed in 1910 and the station at Potsdam substituted as the fundamental point.
',
        ],
        'urn:ogc:def:datum:EPSG::6315' => [
            'name' => 'Conakry 1905',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guinea - onshore',
            'help' => 'Fundamental point: Conakry. Latitude: 10.573766g N, longitude: 17.833682g W (of Paris).
',
        ],
        'urn:ogc:def:datum:EPSG::6316' => [
            'name' => 'Dealul Piscului 1930',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Romania - onshore',
            'help' => 'Fundamental point: latitude 44°24\'33.9606"N, longitude 26°06\'44.8772"E (of Greenwich).
Replaced by Pulkovo 1942(58) (datum code 6179)',
        ],
        'urn:ogc:def:datum:EPSG::6318' => [
            'name' => 'National Geodetic Network',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Kuwait - onshore',
            'help' => '
Replaces 1984 adjustment which used the WGS72 ellipsoid.',
        ],
        'urn:ogc:def:datum:EPSG::6319' => [
            'name' => 'Kuwait Utility',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Kuwait - Kuwait City',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6322' => [
            'name' => 'World Geodetic System 1972',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7043',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1972.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Developed from a worldwide distribution of terrestrial and geodetic satellite observations and defined through a set of station coordinates.
Used by GPS before 1987. For Transit satellite positioning see also WGS 72BE.',
        ],
        'urn:ogc:def:datum:EPSG::6324' => [
            'name' => 'WGS 72 Transit Broadcast Ephemeris',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7043',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1972.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => '
Alleged datum for use with Transit broadcast ephemeris prior to 1989. Relationship to WGS 72 has changed over time.',
        ],
        'urn:ogc:def:datum:EPSG::6326' => [
            'name' => 'World Geodetic System 1984 ensemble',
            'type' => 'ensemble',
            'ellipsoid' => null,
            'prime_meridian' => null,
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'ensemble' => [
                'urn:ogc:def:datum:EPSG::1166',
                'urn:ogc:def:datum:EPSG::1152',
                'urn:ogc:def:datum:EPSG::1153',
                'urn:ogc:def:datum:EPSG::1154',
                'urn:ogc:def:datum:EPSG::1155',
                'urn:ogc:def:datum:EPSG::1156',
                'urn:ogc:def:datum:EPSG::1309',
                'urn:ogc:def:datum:EPSG::1383',
            ],
            'help' => '
EPSG::6326 has been the then current realization. No distinction is made between the original and subsequent (G730, G873, G1150, G1674, G1762, G2139 and G2296) WGS 84 frames. Since 1997, WGS 84 has been maintained within 10cm of the then current ITRF.',
        ],
        'urn:ogc:def:datum:EPSG::6600' => [
            'name' => 'Anguilla 1957',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Anguilla - onshore',
            'help' => 'Fundamental point: station A4, Police.
',
        ],
        'urn:ogc:def:datum:EPSG::6601' => [
            'name' => 'Antigua 1943',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Antigua - onshore',
            'help' => 'Fundamental point: station A14.
',
        ],
        'urn:ogc:def:datum:EPSG::6602' => [
            'name' => 'Dominica 1945',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Dominica - onshore',
            'help' => 'Fundamental point: station M12.
',
        ],
        'urn:ogc:def:datum:EPSG::6603' => [
            'name' => 'Grenada 1953',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Grenada and southern Grenadines - onshore',
            'help' => 'Fundamental point: station GS8, Sante Marie.
',
        ],
        'urn:ogc:def:datum:EPSG::6604' => [
            'name' => 'Montserrat 1958',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Montserrat - onshore',
            'help' => 'Fundamental point: station M36.
',
        ],
        'urn:ogc:def:datum:EPSG::6605' => [
            'name' => 'St. Kitts 1955',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Kitts and Nevis - onshore',
            'help' => 'Fundamental point: station K12.
',
        ],
        'urn:ogc:def:datum:EPSG::6606' => [
            'name' => 'St. Lucia 1955',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Lucia - onshore',
            'help' => 'Fundamental point: station DCS3.
',
        ],
        'urn:ogc:def:datum:EPSG::6607' => [
            'name' => 'St. Vincent 1945',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Vincent and the Grenadines - onshore',
            'help' => 'Fundamental point: station V1, Fort Charlotte.
',
        ],
        'urn:ogc:def:datum:EPSG::6608' => [
            'name' => 'North American Datum 1927 (1976)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Canada - Ontario',
            'help' => 'Fundamental point: Meade\'s Ranch. Latitude: 39°13\'26.686"N, longitude: 98°32\'30.506"W (of Greenwich).
NAD27(76) used in Ontario for all maps at scale 1/20 000 and larger; elsewhere in Canada for selected purposes.',
        ],
        'urn:ogc:def:datum:EPSG::6609' => [
            'name' => 'North American Datum 1927 (CGQ77)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Canada - Quebec',
            'help' => 'Fundamental point: Meade\'s Ranch. Latitude: 39°13\'26.686"N, longitude: 98°32\'30.506"W (of Greenwich).
NAD27 (CGQ77) used in Quebec for all maps at scale 1/20 000 and larger; generally for maps issued by the Quebec cartography office whose reference system is CGQ77.',
        ],
        'urn:ogc:def:datum:EPSG::6610' => [
            'name' => 'Xian 1980',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7049',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - onshore',
            'help' => 'Xian observatory.
',
        ],
        'urn:ogc:def:datum:EPSG::6611' => [
            'name' => 'Hong Kong 1980',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - Hong Kong',
            'help' => 'Fundamental point: Trig "Zero", 38.4 feet south along the transit circle of the Kowloon Observatory. Latitude 22°18\'12.82"N, longitude 114°10\'18.75"E (of Greenwich).
Replaces Hong Kong 1963 and Hong Kong 1963(67).',
        ],
        'urn:ogc:def:datum:EPSG::6612' => [
            'name' => 'Japanese Geodetic Datum 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Japan',
            'help' => 'ITRF94 at epoch 1997.0. Fundamental point: Tokyo-Taisho, latitude: 35°39\'29.1572"N, longitude: 139°44\'28.8759"E (of Greenwich).
Instigated under amendment to the Japanese Surveying Law with effect from April 2002. Replaces Tokyo datum (code 6301). Replaced by JGD2011 (datum code 1128) with effect from 21st October 2011.',
        ],
        'urn:ogc:def:datum:EPSG::6613' => [
            'name' => 'Gunung Segara',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia - Kalimantan E',
            'help' => 'Station P5 (Gunung Segara). Latitude 0°32\'12.83"S, longitude 117°08\'48.47"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6614' => [
            'name' => 'Qatar National Datum 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Qatar - onshore',
            'help' => 'Defined by transformation from WGS 84 - see coordinate operation code 1840.
',
        ],
        'urn:ogc:def:datum:EPSG::6615' => [
            'name' => 'Porto Santo 1936',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Madeira archipelago onshore',
            'help' => 'SE Base on Porto Santo island.
Replaced by 1995 adjustment (datum code 6663). For Selvagens see Selvagem Grande (code 6616).',
        ],
        'urn:ogc:def:datum:EPSG::6616' => [
            'name' => 'Selvagem Grande',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Selvagens onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6618' => [
            'name' => 'South American Datum 1969',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7050',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'South America - SAD69 by country',
            'help' => 'Fundamental point: Chua. Geodetic latitude: 19°45\'41.6527"S; geodetic longitude: 48°06\'04.0639"W (of Greenwich). (Astronomic coordinates: Latitude 19°45\'41.34"S +/- 0.05", longitude 48°06\'07.80"W +/- 0.08").
SAD69 uses GRS 1967 ellipsoid but with 1/f to exactly 2 decimal places. In Brazil only, replaced by SAD69(96) (datum code 1075).',
        ],
        'urn:ogc:def:datum:EPSG::6619' => [
            'name' => 'SWEREF99',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sweden',
            'help' => 'Densification of ETRS89.
The solution was calculated in ITRF97 epoch 1999.5, and has subsequently been corrected to ETRS89 in accordance with guidelines given by EUREF.',
        ],
        'urn:ogc:def:datum:EPSG::6620' => [
            'name' => 'Point 58',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - 12th parallel N',
            'help' => 'Fundamental point: Point 58. Latitude: 12°52\'44.045"N, longitude: 3°58\'37.040"E (of Greenwich).
Used as the basis for computation of the 12th Parallel traverse conducted 1966-70 from Senegal to Chad and connecting to the Blue Nile 1958 (Adindan) triangulation in Sudan.',
        ],
        'urn:ogc:def:datum:EPSG::6621' => [
            'name' => 'Fort Marigot',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - St Martin and St Barthelemy - onshore',
            'help' => '
Replaced by RRAF 1991 (datum code 1047).',
        ],
        'urn:ogc:def:datum:EPSG::6622' => [
            'name' => 'Guadeloupe 1948',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Guadeloupe - Grande-Terre and surrounding islands - onshore',
            'help' => '
Replaced by RRAF 1991 (datum code 1047).',
        ],
        'urn:ogc:def:datum:EPSG::6623' => [
            'name' => 'Centre Spatial Guyanais 1967',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Guiana - coastal area',
            'help' => 'Fundamental point: Kourou-Diane. Latitude: 5°15\'53.699"N, longitude: 52°48\'09.149"W (of Greenwich).
Replaced by RGFG95 (code 6624).',
        ],
        'urn:ogc:def:datum:EPSG::6624' => [
            'name' => 'Reseau Geodesique Francais Guyane 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Guiana',
            'help' => 'ITRF93 at epoch 1995.0
Replaces CSG67 (datum code 6623).',
        ],
        'urn:ogc:def:datum:EPSG::6625' => [
            'name' => 'Martinique 1938',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Martinique - onshore',
            'help' => 'Fundamental point: Fort Desaix. Latitude: 14°36\'54.090"N, longitude: 61°04\'04.030"W (of Greenwich).
Replaced by RRAF 1991 (datum code 1047).',
        ],
        'urn:ogc:def:datum:EPSG::6626' => [
            'name' => 'Reunion 1947',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Reunion - onshore',
            'help' => 'Fundamental point: Piton des Neiges (Borne). Latitude: 21°05\'13.119"S, longitude: 55°29\'09.193"E (of Greenwich).
Replaced by RGR92 (datum code 6627).',
        ],
        'urn:ogc:def:datum:EPSG::6627' => [
            'name' => 'Reseau Geodesique de la Reunion 1992',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Reunion',
            'help' => 'ITRF91 at epoch 1993.0
Replaces Piton des Neiges (code 6626).',
        ],
        'urn:ogc:def:datum:EPSG::6628' => [
            'name' => 'Tahiti 52',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Moorea and Tahiti',
            'help' => 'Fundamental point: Tahiti North Base. Latitude: 17°38\'10.0"S, longitude: 149°36\'57.8"W (of Greenwich).
Replaced by Tahiti 79 (datum code 6690) in Tahiti and Moorea 87 (code 6691) in Moorea.',
        ],
        'urn:ogc:def:datum:EPSG::6629' => [
            'name' => 'Tahaa 54',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Bora Bora, Huahine, Raiatea, Tahaa',
            'help' => 'Fundamental point: Tahaa East Base. Latitude: 16°33\'20.97"S, longitude: 151°29\'06.25"W (of Greenwich).
Replaced by RGPF (datum code 6687).',
        ],
        'urn:ogc:def:datum:EPSG::6630' => [
            'name' => 'IGN72 Nuku Hiva',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Marquesas Islands - Nuku Hiva, Ua Huka and Ua Pou',
            'help' => 'Fundamental point: Taiohae. Latitude: 8°55\'03.97"S, longitude: 140°05\'36.24"W (of Greenwich).
Replaced by RGPF (datum code 6687).',
        ],
        'urn:ogc:def:datum:EPSG::6632' => [
            'name' => 'Combani 1950',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mayotte - onshore',
            'help' => 'Combani South Base.
Replaced by RGM04 and Cadastre 1997 (datum codes 1036-37).',
        ],
        'urn:ogc:def:datum:EPSG::6633' => [
            'name' => 'IGN56 Lifou',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia - Lifou',
            'help' => 'South end of the Goume base.
',
        ],
        'urn:ogc:def:datum:EPSG::6634' => [
            'name' => 'IGN72 Grande Terre',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia - Grande Terre',
            'help' => 'North end of Gomen base.
',
        ],
        'urn:ogc:def:datum:EPSG::6636' => [
            'name' => 'Petrels 1972',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Antarctica - Adelie Land - Petrels island',
            'help' => 'Fundamental point: Astro station DZ on Ile de Petrels. Latitude: 66°40\'00"S, longitude: 140°00\'46"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6637' => [
            'name' => 'Pointe Geologie Perroud 1950',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Antarctica - Adelie Land coastal area',
            'help' => 'Fundamental point: Astro station G.0 on Pointe Geologie. Latitude: 66°39\'30"S, longitude: 140°01\'00"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6638' => [
            'name' => 'Saint Pierre et Miquelon 1950',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Pierre and Miquelon - onshore',
            'help' => '
Replaced by RGSPM06 (datum code 1038).',
        ],
        'urn:ogc:def:datum:EPSG::6639' => [
            'name' => 'MOP78',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Wallis and Futuna - Wallis',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6641' => [
            'name' => 'IGN53 Mare',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia - Mare',
            'help' => 'South-east end of the La Roche base.
',
        ],
        'urn:ogc:def:datum:EPSG::6642' => [
            'name' => 'ST84 Ile des Pins',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia - Ile des Pins',
            'help' => 'Fundamental point: Pic Nga.
',
        ],
        'urn:ogc:def:datum:EPSG::6643' => [
            'name' => 'ST71 Belep',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia - Belep',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6644' => [
            'name' => 'NEA74 Noumea',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia - Grande Terre - Noumea',
            'help' => 'Noumea old signal station.
',
        ],
        'urn:ogc:def:datum:EPSG::6646' => [
            'name' => 'Grand Comoros',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Comoros - Njazidja (Grande Comore)',
            'help' => 'Fundamental point: M\'Tsaoueni.  Latitude: 11°28\'32.200"S, longitude: 43°15\'42.315"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6647' => [
            'name' => 'International Terrestrial Reference Frame 1988',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1988.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 3-dimensional Cartesian station coordinates (SCS).
Realization of the IERS Terrestrial Reference System (ITRS) at epoch 1988.0. Replaced by ITRF89 (code 6648).',
        ],
        'urn:ogc:def:datum:EPSG::6648' => [
            'name' => 'International Terrestrial Reference Frame 1989',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1988.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 3-dimensional Cartesian station coordinates (SCS) for epoch 1988.0.
Realization of the IERS Terrestrial Reference System (ITRS) from April 1991. Replaces ITRF88 (code 6647). Replaced by ITRF90 (code 6649).',
        ],
        'urn:ogc:def:datum:EPSG::6649' => [
            'name' => 'International Terrestrial Reference Frame 1990',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1988.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 3-dimensional Cartesian station coordinates (SCS) for epoch 1988.0.
Realization of the IERS Terrestrial Reference System (ITRS) from December 1991. Replaces ITRF89 (code 6648). Replaced by ITRF91 (code 6650).',
        ],
        'urn:ogc:def:datum:EPSG::6650' => [
            'name' => 'International Terrestrial Reference Frame 1991',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1988.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 3-dimensional Cartesian station coordinates (SCS) for epoch 1988.0.
Realization of the IERS Terrestrial Reference System (ITRS) from October 1992. Replaces ITRF90 (code 6649). Replaced by ITRF92 (code 6651).',
        ],
        'urn:ogc:def:datum:EPSG::6651' => [
            'name' => 'International Terrestrial Reference Frame 1992',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1988.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 287 3-dimensional Cartesian station coordinates (SCS) for epoch 1988.0.
Realization of the IERS Terrestrial Reference System (ITRS) from October 1993. Replaces ITRF91 (code 6650). Replaced by ITRF93 (code 6652).',
        ],
        'urn:ogc:def:datum:EPSG::6652' => [
            'name' => 'International Terrestrial Reference Frame 1993',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1993.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 3-dimensional Cartesian station coordinates (SCS) for epoch 1993.0.
Realization of the IERS Terrestrial Reference System (ITRS) from October 1994. Replaces ITRF92 (code 6651). Replaced by ITRF94 (code 6653).',
        ],
        'urn:ogc:def:datum:EPSG::6653' => [
            'name' => 'International Terrestrial Reference Frame 1994',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1993.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 3-dimensional Cartesian station coordinates (SCS) for epoch 1993.0.
Realization of the IERS Terrestrial Reference System (ITRS) from March 1996. Replaces ITRF93 (code 6652). Replaced by ITRF96 (code 6654).',
        ],
        'urn:ogc:def:datum:EPSG::6654' => [
            'name' => 'International Terrestrial Reference Frame 1996',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1997.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 3-dimensional Cartesian station coordinates (SCS) for epoch 1997.0.
Realization of the IERS Terrestrial Reference System (ITRS) from May 1998. Replaces ITRF94 (code 6653). Replaced by ITRF97 (code 6655).',
        ],
        'urn:ogc:def:datum:EPSG::6655' => [
            'name' => 'International Terrestrial Reference Frame 1997',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1997.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 3-dimensional Cartesian station coordinates (SCS) for epoch 1997.0.
Realization of the IERS Terrestrial Reference System (ITRS) from May 1999. Replaces ITRF96 (code 6654). Replaced by ITRF2000 (code 6656).',
        ],
        'urn:ogc:def:datum:EPSG::6656' => [
            'name' => 'International Terrestrial Reference Frame 2000',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1997.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, orientated to the BIH Terrestrial System at epoch 1984.0. Datum defined by a set of 3-dimensional Cartesian station coordinates (SCS) for epoch 1997.0.
Realization of the IERS Terrestrial Reference System (ITRS) from 2004. Replaces ITRF97 (code 6655). Replaced by ITRF2005 (code 6896).',
        ],
        'urn:ogc:def:datum:EPSG::6657' => [
            'name' => 'Reykjavik 1900',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7051',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iceland - mainland',
            'help' => 'Fundamental point:  Latitude: 64°08\'31.88"N, longitude: 21°55\'51.15"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6658' => [
            'name' => 'Hjorsey 1955',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iceland - mainland',
            'help' => 'Fundamental point:  Latitude: 64°31\'29.26"N, longitude: 22°22\'05.84"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6659' => [
            'name' => 'Islands Net 1993',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iceland',
            'help' => 'ITRF93 at epoch 1993.6.
Replaced by ISN2004 (datum code 1060).',
        ],
        'urn:ogc:def:datum:EPSG::6660' => [
            'name' => 'Helle 1954',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Jan Mayen - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6661' => [
            'name' => 'Latvian geodetic coordinate system 1992',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Latvia',
            'help' => 'Constrained to 4 ETRS89 points in Latvia from the EUREF Baltic 1992 campaign.
Densification of ETRS89 during the 1992 Baltic campaign. Replaced by Latvian coordinate system 2020 (datum code 1356).',
        ],
        'urn:ogc:def:datum:EPSG::6663' => [
            'name' => 'Porto Santo 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Madeira archipelago onshore',
            'help' => 'SE Base on Porto Santo island. Origin and orientation constrained to those of the 1936 adjustment.
Classical and GPS observations. Replaces 1936 adjustment (datum code 6615). For Selvagens see Selvagem Grande (datum code 6616).',
        ],
        'urn:ogc:def:datum:EPSG::6664' => [
            'name' => 'Azores Oriental Islands 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores E - onshore',
            'help' => 'Fundamental point: Forte de São Bras. Origin and orientation constrained to those of the 1940 adjustment.
Classical and GPS observations. Replaces 1940 adjustment (datum code 6184).',
        ],
        'urn:ogc:def:datum:EPSG::6665' => [
            'name' => 'Azores Central Islands 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - Azores C - onshore',
            'help' => 'Fundamental point: Graciosa south west base. Origin and orientation constrained to those of the 1948 adjustment.
Classical and GPS observations. Replaces 1948 adjustment (datum code 6183).',
        ],
        'urn:ogc:def:datum:EPSG::6666' => [
            'name' => 'Lisbon 1890',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - mainland - onshore',
            'help' => 'Fundamental point: Castelo Sao Jorge, Lisbon. Latitude: 38°42\'43.631"N, longitude: 9°07\'54.862"W of Greenwich.
Replaced by Lisbon 1937 adjustment (which uses International 1924 ellipsoid).',
        ],
        'urn:ogc:def:datum:EPSG::6667' => [
            'name' => 'Iraq-Kuwait Boundary Datum 1992',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East - Iraq-Kuwait boundary',
            'help' => 'Four stations established between September and December 1991 determined by GPS and Doppler observations.
',
        ],
        'urn:ogc:def:datum:EPSG::6668' => [
            'name' => 'European Datum 1979',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - west',
            'help' => 'Fundamental point: Potsdam (Helmert Tower). Latitude: 52°22\'51.4456"N, longitude: 13°03\'58.9283"E (of Greenwich).
Replaced by 1987 adjustment.',
        ],
        'urn:ogc:def:datum:EPSG::6670' => [
            'name' => 'Istituto Geografico Militaire 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Italy - including San Marino and Vatican',
            'help' => 'Densification of ETRF89 in Italy. Network of 1296 points observed 1992-1995 adjusted in 1996 constrained to 9 ETRF89 points at epoch 1989.0. By April 2021 the framework was composed of 3104 points of the fundamental network and 3819 densification points.
Replaced by RDN2008 (datum code 1132) from 2011-11-10.',
        ],
        'urn:ogc:def:datum:EPSG::6671' => [
            'name' => 'Voirol 1879',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Algeria - north of 32°N',
            'help' => 'Fundamental point: Voirol. Latitude: 36°45\'08.199"N, longitude: 3°02\'49.435"E (of Greenwich). Uses RGS (and old IGN) value of 2°20\'13.95"for Greenwich-Paris meridian difference.
Replaces Voirol 1875 (code 6304).',
        ],
        'urn:ogc:def:datum:EPSG::6672' => [
            'name' => 'Chatham Islands Datum 1971',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - Chatham Islands group',
            'help' => '
Replaced by Chatham Islands Datum 1979 (code 6673).',
        ],
        'urn:ogc:def:datum:EPSG::6673' => [
            'name' => 'Chatham Islands Datum 1979',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Zealand - Chatham Islands group',
            'help' => 'Fundamental point: station Astro. Latitude: 43°57\'23.60"S, longitude: 176°34\'28.65"W (of Greenwich).
Replaces Chatham Islands Datum 1971 (code 6672). Replaced by New Zealand Geodetic Datum 2000 (code 6167) from March 2000.',
        ],
        'urn:ogc:def:datum:EPSG::6674' => [
            'name' => 'Sistema de Referencia Geocentrico para las AmericaS 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Latin America - SIRGAS 2000 by country',
            'help' => 'ITRF2000 at epoch 2000.40.
Realized by a frame of 184 stations observed in 2000 and adjusted in the ITRF2000. Includes ties to tide gauges. Replaces SIRGAS 1995 system for South America; expands SIRGAS to Central America. Name changed in 2001 for use in all of Latin America.',
        ],
        'urn:ogc:def:datum:EPSG::6675' => [
            'name' => 'Guam 1963',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Pacific - Guam and NMI - onshore',
            'help' => 'Fundamental point: Tagcha. Latitude: 13°22\'38.49"N, longitude: 144°45\'51.56"E (of Greenwich).
Replaced by NAD83(HARN)',
        ],
        'urn:ogc:def:datum:EPSG::6676' => [
            'name' => 'Vientiane 1982',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Laos',
            'help' => 'Fundamental point: Vientiane (Nongteng) Astro Pillar. Latitude: 18°01\'31.6301"N, longitude: 102°30\'56.6999"E (of Greenwich).
Replaced by Lao 1993.',
        ],
        'urn:ogc:def:datum:EPSG::6677' => [
            'name' => 'Lao 1993',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Laos',
            'help' => 'Fundamental point: Lao 1982 coordinates of Pakxa pillar. Latitude: 18°23\'57.0056"N, longitude: 103°38\'41.8020"E (of Greenwich). Orientation parallel with WGS 84.
Replaces Vientiane 1982. Replaced by Lao 1997',
        ],
        'urn:ogc:def:datum:EPSG::6678' => [
            'name' => 'Lao National Datum 1997',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7024',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Laos',
            'help' => 'Fundamental point: Vientiane (Nongteng) Astro Pillar. Latitude: 18°01\'31.3480"N, longitude: 102°30\'57.1376"E (of Greenwich).
Replaces Lao 1993.',
        ],
        'urn:ogc:def:datum:EPSG::6679' => [
            'name' => 'Jouik 1961',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mauritania - north coast',
            'help' => '
Replaced by Mauritania 1999 (datum code 6702).',
        ],
        'urn:ogc:def:datum:EPSG::6680' => [
            'name' => 'Nouakchott 1965',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mauritania - central coast',
            'help' => 'Nouakchott astronomical point.
Triangulation limited to environs of Nouakchott. Extended in 1982 by satellite translocation from a single station "Ruines" to support Syledis chain for offshore operations. Replaced by Mauritania 1999 (datum code 6602).',
        ],
        'urn:ogc:def:datum:EPSG::6682' => [
            'name' => 'Gulshan 303',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7015',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bangladesh',
            'help' => 'Gulshan garden, Dhaka.
Network of more than 140 control points observed and adjusted in 1995 by Japan International Cooperation Agency (JICA).',
        ],
        'urn:ogc:def:datum:EPSG::6683' => [
            'name' => 'Philippine Reference System 1992',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Philippines',
            'help' => 'Fundamental point: Balacan. Latitude: 13°33\'41.000"N, longitude: 121°52\'03.000"E (of Greenwich), geoid-ellipsoid separation 0.34m.
Replaces Luzon 1911 datum (code 6253).',
        ],
        'urn:ogc:def:datum:EPSG::6684' => [
            'name' => 'Gan 1970',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Maldives - onshore',
            'help' => '
In some references incorrectly named "Gandajika 1970". See datum code 6685.',
        ],
        'urn:ogc:def:datum:EPSG::6686' => [
            'name' => 'Marco Geocentrico Nacional de Referencia',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Colombia',
            'help' => 'Densification of SIRGAS95 (ITRF94 at epoch 1995.4) in Colombia. Bogota observatory coordinates: Latitude: 4°35\'46.3215"N, longitude: 74°04\'39.0285"W (of Greenwich).
Densification of SIRGAS 1995 within Colombia. Replaces Bogota 1975 (datum code 6218).',
        ],
        'urn:ogc:def:datum:EPSG::6687' => [
            'name' => 'Reseau Geodesique de la Polynesie Francaise',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia',
            'help' => 'ITRF92 at epoch 1993.0. Densification by GPS of the Reference Network of French Polynesia, a coordinate set of 13 stations determined through DORIS observations.
Replaces Tahaa 54 (datum code 6629), IGN 63 Hiva Oa (6689), IGN 72 Nuku Hiva (6630), Maupiti 83 (6692), MHEFO 55 (6688), Moorea 87 (6691) and Tahiti 79 (6690).',
        ],
        'urn:ogc:def:datum:EPSG::6688' => [
            'name' => 'Fatu Iva 72',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Marquesas Islands - Fatu Hiva',
            'help' => 'Fundamental point: Latitude: 9°25\'58.00"S, longitude: 138°55\'06.25"W (of Greenwich).
Recomputed by IGN in 1972 using origin and observations of 1953-1955 Mission Hydrographique des Establissements Francais d\'Oceanie (MHEFO 55). Replaced by RGPF (datum code 6687).',
        ],
        'urn:ogc:def:datum:EPSG::6689' => [
            'name' => 'IGN63 Hiva Oa',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Marquesas Islands - Hiva Oa and Tahuata',
            'help' => 'Fundamental point: Atuona. Latitude: 9°48\'27.20"S, longitude: 139°02\'15.45"W (of Greenwich).
Replaced by RGPF (datum code 6687).',
        ],
        'urn:ogc:def:datum:EPSG::6690' => [
            'name' => 'Tahiti 79',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Tahiti',
            'help' => 'Fundamental point: Tahiti North Base. Latitude: 17°38\'10.0"S, longitude: 149°36\'57.8"W (of Greenwich).
Replaces Tahiti 52 (datum code 6628) in Tahiti. Replaced by RGPF (datum code 6687).',
        ],
        'urn:ogc:def:datum:EPSG::6691' => [
            'name' => 'Moorea 87',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Moorea',
            'help' => 'Two stations on Tahiti whose coordinates from the Tahiti 1979 adjustment were held fixed.
Replaces Tahiti 52 (datum code 6628) in Moorea. Replaced by RGPF (datum code 6687).',
        ],
        'urn:ogc:def:datum:EPSG::6692' => [
            'name' => 'Maupiti 83',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Polynesia - Society Islands - Maupiti',
            'help' => 'Fundamental point: Pitiahe South Base. Latitude: 16°28\'28.942"S, longitude: 152°14\'55.059"W (of Greenwich).
Replaced by RGPF (datum code 6687).',
        ],
        'urn:ogc:def:datum:EPSG::6693' => [
            'name' => 'Nakhl-e Ghanem',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iran - Kangan district',
            'help' => 'Coordinates of two stations determined with respect to ITRF 2000 at epoch 2005.2: BMT1 latitude 27°42\'09.8417"N, longitude 52°12\'11.0362"E (of Greenwich); Total1 latitude 27°31\'03.8896"N, longitude 52°36\'13.1312"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6694' => [
            'name' => 'Posiciones Geodesicas Argentinas 1994',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Argentina',
            'help' => 'WGS 84 coordinates at time of survey of a geodetic network of 127 points defining the National Geodetic System (Sistema Geodésico Nacional). Surveyed between February and April 1993 and between March and May 1994.
Adopted as defining the National Geodetic Reference Network from 9th May 1997. Technically, but not legally, replaced by POSGAR 98 (datum code 6190) until 15th May 2009 when legally replaced by POSGAR 2007 (datum code 1062).',
        ],
        'urn:ogc:def:datum:EPSG::6695' => [
            'name' => 'Katanga 1955',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Congo DR (Zaire) - Katanga',
            'help' => 'Fundamental point: Tshinsenda A. Latitude: 12°30\'31.568"S, longitude: 28°01\'02.971"E (of Greenwich).
Replaces earlier adjustments.',
        ],
        'urn:ogc:def:datum:EPSG::6696' => [
            'name' => 'Kasai 1953',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Congo DR (Zaire) - Kasai - SE',
            'help' => 'Two stations of the Katanga triangulation with ellipsoid change applied: Kabila, latitude 6°58\'34.023"S, longitude 23°50\'24.028"E (of Greenwich); and Gandajika NW base, latitude 6°45\'01.057"S, longitude 23°57\'03.038"E (of Greenwich).
Replaced by IGC 1962 Arc of the 6th Parallel South.',
        ],
        'urn:ogc:def:datum:EPSG::6697' => [
            'name' => 'IGC 1962 Arc of the 6th Parallel South',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Congo DR (Zaire) - 6th parallel south',
            'help' => 'Coordinates of 3 stations determined with respect to Arc 1950: Mulungu 4°47\'39.2325"S, 29°59\'37.5864"E; Nyakawembe 4°14\'57.3618"S, 29°42\'52.8032"E; Kavula 4°35\'15.8634"S, 29°41\'14.2693"E (all longitude w.r.t. Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6698' => [
            'name' => 'IGN 1962 Kerguelen',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'French Southern Territories - Kerguelen onshore',
            'help' => 'K0 1949.
',
        ],
        'urn:ogc:def:datum:EPSG::6699' => [
            'name' => 'Le Pouce 1934',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mauritius - mainland',
            'help' => 'Fundamental point: Le Pouce. Latitude: 20°11\'42.25"S, longitude: 57°31\'18.58"E (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6700' => [
            'name' => 'IGN Astro 1960',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mauritania - onshore',
            'help' => 'Realised through a set of independent astronomically-positioned points.
Observed during 1959-1960. Independent points not connected through a network. Relative accuracy estimated at 50-100m. Replaced by Mauritania 1999 (datum code 6702).',
        ],
        'urn:ogc:def:datum:EPSG::6701' => [
            'name' => 'Institut Geographique du Congo Belge 1955',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Congo DR (Zaire) - Bas Congo',
            'help' => 'Fundamental point: Yella east base. Latitude: 6°00\'53.139"S, longitude: 12°58\'29.287"E (of Greenwich).
Replaced by IGC 1962 Arc of the 6th Parallel South, except for oil industry activities.',
        ],
        'urn:ogc:def:datum:EPSG::6702' => [
            'name' => 'Mauritania 1999',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Mauritania',
            'help' => 'ITRF96 at epoch 1997.0
A network of 36 GPS stations tied to ITRF96, 8 of which are IGN 1962 astronomic points.',
        ],
        'urn:ogc:def:datum:EPSG::6703' => [
            'name' => 'Missao Hidrografico Angola y Sao Tome 1951',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Angola - Cabinda',
            'help' => 'Extension of Camacupa datum into Cabinda.
A variation of this datum has been adopted by the oil industry but incorrectly using the International 1924 ellipsoid and not tied to the official Portuguese triangulation - see Mhast (onshore) and Mhast (offshore) (codes 6704 and 6705).',
        ],
        'urn:ogc:def:datum:EPSG::6704' => [
            'name' => 'Mhast (onshore)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - Angola (Cabinda) and DR Congo (Zaire) - coastal',
            'help' => 'Probably adopted a Mhast 1951 coordinate set but associated an incorrect ellipsoid with it.
Adopted by oil industry with intention of being Mhast 1951 (code 6703) but incorrectly (for Mhast 1951) used the International 1924 ellipsoid. This datum differs by about 400 metres from the Portuguese Mhast 1951 and Camacupa datums.',
        ],
        'urn:ogc:def:datum:EPSG::6705' => [
            'name' => 'Mhast (offshore)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Africa - Angola (Cabinda) and DR Congo (Zaire) - offshore',
            'help' => 'Fundamental point: Station Y at Malongo base camp. Latitude: 5°23\'30.810"S, longitude: 12°12\'01.590"E (of Greenwich).
Origin coordinates determined by Transit single point position using 32 passes and transformed from WGS72BE using transformation code 15790. Differs from Mhast (onshore) by approximately 10m. Replaced in 1987 by Malongo 1987 (code 6259).',
        ],
        'urn:ogc:def:datum:EPSG::6706' => [
            'name' => 'Egypt Gulf of Suez S-650 TL',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7020',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Egypt - Gulf of Suez',
            'help' => 'Fundamental point: Station S-650 DMX. Adopted coordinates: latitude: 28°19\'02.1907"N, longitude: 33°06\'36.6344"E (of Greenwich). The proper Egypt 1907 coordinates for S-650 differ from these by about 20m.
A coherent set of stations bordering the Gulf of Suez coordinated by Transit translocation ("TL") between 1980 and 1984. Based on incorrect Egypt 1907 values for origin station S-650. Differs from true Egypt 1907 by approximately 20m.',
        ],
        'urn:ogc:def:datum:EPSG::6707' => [
            'name' => 'Tern Island 1961',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - Hawaii - Tern Island and Sorel Atoll',
            'help' => 'Fundamental point: station FRIG on tern island, station B4 on Sorol Atoll.
Two independent astronomic determinations considered to be consistent through adoption of common transformation to WGS 84 (see tfm code 15795).',
        ],
        'urn:ogc:def:datum:EPSG::6708' => [
            'name' => 'Cocos Islands 1965',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7003',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cocos (Keeling) Islands - onshore',
            'help' => 'Fundamental point: Anna 1.
',
        ],
        'urn:ogc:def:datum:EPSG::6709' => [
            'name' => 'Iwo Jima 1945',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Japan - Iwo Jima',
            'help' => 'Fundamental point: Beacon "E".
',
        ],
        'urn:ogc:def:datum:EPSG::6710' => [
            'name' => 'Astro DOS 71',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Helena - St Helena Island',
            'help' => 'Fundamental point: DOS 71/4, Ladder Hill Fort, latitude: 15°55\'30"S, longitude: 5°43\'25"W (of Greenwich).
',
        ],
        'urn:ogc:def:datum:EPSG::6711' => [
            'name' => 'Marcus Island 1952',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Japan - Minamitori-shima (Marcus Island) - onshore',
            'help' => 'Marcus Island Astronomic Station.
',
        ],
        'urn:ogc:def:datum:EPSG::6712' => [
            'name' => 'Ascension Island 1958',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Helena - Ascension Island',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6713' => [
            'name' => 'Ayabelle Lighthouse',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Djibouti',
            'help' => 'Fundamental point: Ayabelle Lighthouse.
',
        ],
        'urn:ogc:def:datum:EPSG::6714' => [
            'name' => 'Bellevue',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Vanuatu - southern islands',
            'help' => '
Datum covers all the major islands of Vanuatu in two different adjustment blocks, but practical usage is as given in the area of use.',
        ],
        'urn:ogc:def:datum:EPSG::6715' => [
            'name' => 'Camp Area Astro',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Antarctica - Camp McMurdo area',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6716' => [
            'name' => 'Phoenix Islands 1966',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Kiribati - Phoenix Islands',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6717' => [
            'name' => 'Cape Canaveral',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'North America - Bahamas and USA - Florida - onshore',
            'help' => 'Fundamental point: Central 1950.  Latitude: 28°29\'32.36555"N, longitude 80°34\'38.77362"W (of Greenwich)
',
        ],
        'urn:ogc:def:datum:EPSG::6718' => [
            'name' => 'Solomon 1968',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Solomon Islands - onshore main islands',
            'help' => 'Fundamental point: GUX 1.
',
        ],
        'urn:ogc:def:datum:EPSG::6719' => [
            'name' => 'Easter Island 1967',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Chile - Easter Island onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6720' => [
            'name' => 'Fiji Geodetic Datum 1986',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7043',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Fiji - onshore',
            'help' => 'NWL 9D coordinates of 6 stations on Vitu Levu and Vanua Levu.
Replaces Viti Levu 1912, Vanua Levu 1915 and Fiji 1956.',
        ],
        'urn:ogc:def:datum:EPSG::6721' => [
            'name' => 'Fiji 1956',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Fiji - main islands',
            'help' => 'Latitude origin was obtained astronomically at station Rasusuva = 17°49\'03.13"S,  longitude origin was obtained astronomically at station Suva = 178°25\'35.835"E (of Greenwich).
For topographic mapping replaces Viti Levu 1912 and Vanua Levu 1915. Replaced by Fiji Geodetic Datum 1986.',
        ],
        'urn:ogc:def:datum:EPSG::6722' => [
            'name' => 'South Georgia 1968',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'South Georgia - onshore',
            'help' => 'Fundamental point: ISTS 061.
',
        ],
        'urn:ogc:def:datum:EPSG::6723' => [
            'name' => 'Grand Cayman Geodetic Datum 1959',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cayman Islands - Grand Cayman',
            'help' => 'Fundamental point: GC1. Latitude: 19°17\'54.43"N, longitude: 81°22\'37.17"W (of Greenwich).
Replaced by CIGD11 (datum code 1100).',
        ],
        'urn:ogc:def:datum:EPSG::6724' => [
            'name' => 'Diego Garcia 1969',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'British Indian Ocean Territory - Diego Garcia',
            'help' => 'Fundamental point: ISTS 073.
',
        ],
        'urn:ogc:def:datum:EPSG::6725' => [
            'name' => 'Johnston Island 1961',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Johnston Island',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6726' => [
            'name' => 'Sister Islands Geodetic Datum 1961',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7008',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Cayman Islands - Little Cayman and Cayman Brac',
            'help' => 'Fundamental point: LC5. Latitude: 19°39\'46.324"N, longitude: 80°03\'47.910"W (of Greenwich).
Replaced by CIGD11 (datum code 1100).',
        ],
        'urn:ogc:def:datum:EPSG::6727' => [
            'name' => 'Midway 1961',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Midway Islands - Sand and Eastern Islands',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6728' => [
            'name' => 'Pico de las Nieves 1984',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - Canary Islands western',
            'help' => 'Pico de las Nieves mountain, Gran Canaria. The fundamental point is a different station to that for PN68.
Replaces Pico de las Nieves 1968 (PN68) only on western islands (El Hierro, La Gomera, La Palma and Tenerife). Replaced by REGCAN95.',
        ],
        'urn:ogc:def:datum:EPSG::6729' => [
            'name' => 'Pitcairn 1967',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Pitcairn - Pitcairn Island',
            'help' => 'Fundamental point: Pitcairn Astro. Latitude: 25°04\'06.87"S, longitude: 130°06\'47.83"W (of Greenwich).
Replaced by Pitcairn 2006.',
        ],
        'urn:ogc:def:datum:EPSG::6730' => [
            'name' => 'Santo 1965',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Vanuatu - northern islands',
            'help' => '
Datum covers all the major islands of Vanuatu in two different adjustment blocks, but practical usage is as given in the area of use.',
        ],
        'urn:ogc:def:datum:EPSG::6732' => [
            'name' => 'Marshall Islands 1960',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7053',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Pacific - Marshall Islands, Wake - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6733' => [
            'name' => 'Wake Island 1952',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Wake - onshore',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6734' => [
            'name' => 'Tristan 1968',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'St Helena - Tristan da Cunha',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6735' => [
            'name' => 'Kusaie 1951',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Micronesia - Kosrae (Kusaie)',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6736' => [
            'name' => 'Deception Island',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Antarctica - Deception Island',
            'help' => '
',
        ],
        'urn:ogc:def:datum:EPSG::6737' => [
            'name' => 'Korean Geodetic Datum 2002',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Korea, Republic of (South Korea)',
            'help' => 'ITRF2000 at epoch 2002.0.
KGD2002 is geocentric.',
        ],
        'urn:ogc:def:datum:EPSG::6738' => [
            'name' => 'Hong Kong 1963',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7007',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - Hong Kong',
            'help' => 'Fundamental point: Trig "Zero", 38.4 feet south along the transit circle of the Kowloon Observatory. Latitude 22°18\'12.82"N, longitude 114°10\'18.75"E (of Greenwich).
Replaced by Hong Kong 1963(67) for military purposes only in 1967. Replaced by Hong Kong 1980.',
        ],
        'urn:ogc:def:datum:EPSG::6739' => [
            'name' => 'Hong Kong 1963(67)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'China - Hong Kong',
            'help' => 'Fundamental point: Trig "Zero", 38.4 feet south along the transit circle of the Kowloon Observatory. Latitude 22°18\'12.82"N, longitude 114°10\'18.75"E (of Greenwich).
Replaces Hong Kong 1963 for military purposes only in 1967. Replaced by Hong Kong 1980.',
        ],
        'urn:ogc:def:datum:EPSG::6740' => [
            'name' => 'Parametry Zemli 1990',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7054',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1990.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Defined through coordinates of stations of the satellite geodetic network (SGN) in Russia at epoch 1990.0.
Replaced by PZ-90.02 from 2007-09-20.',
        ],
        'urn:ogc:def:datum:EPSG::6741' => [
            'name' => 'Faroe Datum 1954',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Faroe Islands - onshore',
            'help' => 'Astronomical observations at 3 points.
Replaced by ED50 in late 1970\'s for all purposes other than cadastre. Replaced by fk89 for cadastre.',
        ],
        'urn:ogc:def:datum:EPSG::6742' => [
            'name' => 'Geodetic Datum of Malaysia 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Malaysia',
            'help' => 'ITRF2000, epoch 2000.0.
Replaces all older Malaysian datums.',
        ],
        'urn:ogc:def:datum:EPSG::6743' => [
            'name' => 'Karbala 1979',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Iraq - onshore',
            'help' => 'Fundamental point: Karbala. Latitude: 32°34\'14.4941"N, longitude: 44°00\'49.6379"E.
National geodetic network established by Polservice consortium.',
        ],
        'urn:ogc:def:datum:EPSG::6744' => [
            'name' => 'Nahrwan 1934',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7012',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Middle East - Iraq and SW Iran',
            'help' => 'Fundamental point: Nahrwan south base.  Latitude: 33°19\'10.87"N, longitude: 44°43\'25.54"E (of Greenwich).
This adjustment later discovered to have a significant orientation error. In Iran replaced by FD58. In Iraq, replaced by Karbala 1979.',
        ],
        'urn:ogc:def:datum:EPSG::6745' => [
            'name' => 'Rauenberg Datum/83',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - Saxony',
            'help' => 'Fundamental point: Rauenberg. Latitude: 52°27\'12.021"N, longitude: 13°22\'04.928"E (of Greenwich). This station was destroyed in 1910 and the station at Potsdam substituted as the fundamental point.
RD/83 is the realization of DHDN in Saxony. It is the resultant of applying a transformation derived at 106 points throughout former East Germany to Pulkovo 1942/83 points in Saxony.',
        ],
        'urn:ogc:def:datum:EPSG::6746' => [
            'name' => 'Potsdam Datum/83',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Germany - Thuringen',
            'help' => 'Fundamental point: Rauenberg. Latitude: 52°27\'12.021"N, longitude: 13°22\'04.928"E (of Greenwich). This station was destroyed in 1910 and the station at Potsdam substituted as the fundamental point.
PD/83 is the realization of DHDN in Thuringen. It is the resultant of applying a transformation derived at 13 points on the border between East and West Germany to Pulkovo 1942/83 points in Thuringen.',
        ],
        'urn:ogc:def:datum:EPSG::6747' => [
            'name' => 'Greenland 1996',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greenland',
            'help' => 'ITRF94 at epoch 1996.62
Replaces Ammassalik 1958, Qornoq 1927 and Scoresbysund 1952.',
        ],
        'urn:ogc:def:datum:EPSG::6748' => [
            'name' => 'Vanua Levu 1915',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7055',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Fiji - Vanua Levu and Taveuni',
            'help' => 'Latitude origin was obtained astronomically at station Numuiloa = 16°23\'38.36"S, longitude origin was obtained astronomically at station Suva = 178°25\'35.835"E.
For topographic mapping, replaced by Fiji 1956. For other purposes, replaced by Fiji 1986.',
        ],
        'urn:ogc:def:datum:EPSG::6749' => [
            'name' => 'Reseau Geodesique de Nouvelle Caledonie 91-93',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia',
            'help' => 'ITRF90 at epoch 1989.0.
Replaced by RGNC15 (datum code 1357).',
        ],
        'urn:ogc:def:datum:EPSG::6750' => [
            'name' => 'ST87 Ouvea',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'New Caledonia - Ouvea',
            'help' => 'Ouloup.
',
        ],
        'urn:ogc:def:datum:EPSG::6751' => [
            'name' => 'Kertau (RSO)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7056',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Asia - Malaysia (west) and Singapore',
            'help' => '
Adopts metric conversion of 0.914398 metres per yard exactly. This is a truncation of the Sears 1922 ratio.',
        ],
        'urn:ogc:def:datum:EPSG::6752' => [
            'name' => 'Viti Levu 1912',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7055',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Fiji - Viti Levu',
            'help' => 'Latitude origin was obtained astronomically at station Monavatu = 17°53\'28.285"S, longitude origin was obtained astronomically at station Suva = 178°25\'35.835"E.
For topographic mapping, replaced by Fiji 1956. For other purposes, replaced by Fiji 1986.',
        ],
        'urn:ogc:def:datum:EPSG::6753' => [
            'name' => 'fk89',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Faroe Islands - onshore',
            'help' => '
Replaces FD54 for cadastre.',
        ],
        'urn:ogc:def:datum:EPSG::6754' => [
            'name' => 'Libyan Geodetic Datum 2006',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Libya',
            'help' => '5 stations tied to ITRF2000 through 8 days of continuous observations in May 2006.
Replaces ELD79.',
        ],
        'urn:ogc:def:datum:EPSG::6755' => [
            'name' => 'Datum Geodesi Nasional 1995',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia',
            'help' => 'ITRF91at epoch 1992.0.
Replaces ID74 and all older datums.',
        ],
        'urn:ogc:def:datum:EPSG::6756' => [
            'name' => 'Vietnam 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Vietnam - onshore',
            'help' => 'Point N00, located in the premises of the Land Administration Research Institute, Hoang Quoc Viet Street, Hanoi.
Replaces Hanoi 1972.',
        ],
        'urn:ogc:def:datum:EPSG::6757' => [
            'name' => 'SVY21',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Singapore',
            'help' => 'Fundamental point: Base 7 at Pierce Reservoir. Latitude: 1°22\'02.9154"N, longitude: 103°49\'31.9752"E (of Greenwich).
Replaces Kertau 1968 for cadastral purposes from August 2004.',
        ],
        'urn:ogc:def:datum:EPSG::6758' => [
            'name' => 'Jamaica 2001',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Jamaica',
            'help' => 'Aligned to WGS 84.
',
        ],
        'urn:ogc:def:datum:EPSG::6759' => [
            'name' => 'NAD83 (National Spatial Reference System 2007)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'USA - CONUS and Alaska; PRVI',
            'help' => 'Coordinates of 486 national continually operating reference system (CORS) and 195 collaborative GPS (CGPS) sites constrained to their CORS96 values, ITRF2000 at epoch 2002.0.
Replaced by NAD83 (National Spatial Reference System 2011), datum code 1116.',
        ],
        'urn:ogc:def:datum:EPSG::6760' => [
            'name' => 'World Geodetic System 1966',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7025',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 1966.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Developed from a worldwide distribution of terrestrial and geodetic satellite observations and defined through a set of station coordinates.
A worldwide 5° × 5° mean free air gravity anomaly field provided the basic data for producing the WGS 66 gravimetric geoid. Replaced by WGS 72.',
        ],
        'urn:ogc:def:datum:EPSG::6761' => [
            'name' => 'Croatian Terrestrial Reference System',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Croatia',
            'help' => 'Densification of ETRS89 in Croatia at epoch 1995.55.
Based on 78 control points with coordinates determined in ETRS89.',
        ],
        'urn:ogc:def:datum:EPSG::6762' => [
            'name' => 'Bermuda 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Bermuda',
            'help' => 'ITRF96 at epoch 2000.0.
',
        ],
        'urn:ogc:def:datum:EPSG::6763' => [
            'name' => 'Pitcairn 2006',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7030',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Pitcairn - Pitcairn Island',
            'help' => 'Fundamental point: Pitcairn Astro. Latitude: 25°04\'06.7894"S, longitude: 130°06\'46.6816"W (of Greenwich), derived by single point GPS oberservations.
Replaces Pitcairn 1967.',
        ],
        'urn:ogc:def:datum:EPSG::6764' => [
            'name' => 'Ross Sea Region Geodetic Datum 2000',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Antarctica - Ross Sea Region',
            'help' => 'Based on ITRF96 at epoch 2000.0
',
        ],
        'urn:ogc:def:datum:EPSG::6765' => [
            'name' => 'Slovenia Geodetic Datum 1996',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Slovenia',
            'help' => 'Densification of ETRS89, based on ITRS89 at epoch 1995.55.
',
        ],
        'urn:ogc:def:datum:EPSG::6801' => [
            'name' => 'CH1903 (Bern)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8907',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Liechtenstein and Switzerland',
            'help' => 'Fundamental point: Old Bern observatory. Latitude: 46°57\'08.660"N, longitude: 0°E (of Bern).
',
        ],
        'urn:ogc:def:datum:EPSG::6802' => [
            'name' => 'Bogota 1975 (Bogota)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8904',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Colombia - mainland',
            'help' => 'Fundamental point: Bogota observatory. Latitude: 4°35\'56.570"N, longitude: 0°E (of Bogota).
',
        ],
        'urn:ogc:def:datum:EPSG::6803' => [
            'name' => 'Lisbon 1937 (Lisbon)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8902',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - mainland - onshore',
            'help' => 'Fundamental point: Castelo Sao Jorge, Lisbon. Latitude: 38°42\'43.631"N, longitude: 0°E (of Lisbon).
Replaces Lisbon 1890 adjustment (which used Bessel 1841 ellipsoid).',
        ],
        'urn:ogc:def:datum:EPSG::6804' => [
            'name' => 'Makassar (Jakarta)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8908',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia - Sulawesi SW',
            'help' => 'Fundamental point: station P1, Moncongloe. Latitude 5°08\'41.42"S, longitude 12°35\'47.15"E (of Jakarta).
',
        ],
        'urn:ogc:def:datum:EPSG::6805' => [
            'name' => 'Militar-Geographische Institut (Ferro)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8909',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Austria and former Yugoslavia onshore',
            'help' => 'Fundamental point: Hermannskogel. Latitude: 48°16\'15.29"N, longitude: 33°57\'41.06"E (of Ferro).
Replaced by MGI in Austria and MGI 1901 in former Yugoslavia.',
        ],
        'urn:ogc:def:datum:EPSG::6806' => [
            'name' => 'Monte Mario (Rome)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8906',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Italy - including San Marino and Vatican',
            'help' => 'Fundamental point: Monte Mario. Latitude: 41°55\'25.51"N, longitude: 0°00\' 00.00"E (of Rome).
Replaced Genova datum, Bessel 1841 ellipsoid, from 1940.',
        ],
        'urn:ogc:def:datum:EPSG::6807' => [
            'name' => 'Nouvelle Triangulation Francaise (Paris)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8903',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France - onshore - mainland and Corsica',
            'help' => 'Fundamental point: Pantheon. Latitude: 54.273618g N, longitude: 0.0106921g E (of Paris).
',
        ],
        'urn:ogc:def:datum:EPSG::6809' => [
            'name' => 'Reseau National Belge 1950 (Brussels)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8910',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Belgium - onshore',
            'help' => 'Fundamental point: Lommel (tower). Latitude: 51°13\'47.334"N, longitude: 0°56\'44.773"E (of Brussels).
',
        ],
        'urn:ogc:def:datum:EPSG::6810' => [
            'name' => 'Tananarive 1925 (Paris)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7022',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8903',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Madagascar - onshore',
            'help' => 'Fundamental point: Tananarive observatory. Latitude: 21.0191667g S, longitude: 50.23849537g E (of Paris)
',
        ],
        'urn:ogc:def:datum:EPSG::6811' => [
            'name' => 'Voirol 1875 (Paris)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8903',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Algeria - north of 32°N',
            'help' => 'Fundamental point: Voirol. Latitude: 40.83578 grads N, longitude: 0.78873 grads E (of Paris).
',
        ],
        'urn:ogc:def:datum:EPSG::6813' => [
            'name' => 'Batavia (Jakarta)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8908',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia - Bali, Java and western Sumatra onshore',
            'help' => 'Fundamental point: Longitude at Batavia astronomical station. Latitude: 6°07\'39.522"S, longitude: 0°00\'00.0"E (of Jakarta). Latitude and azimuth at Genuk.
',
        ],
        'urn:ogc:def:datum:EPSG::6814' => [
            'name' => 'Stockholm 1938 (Stockholm)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8911',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Sweden - onshore',
            'help' => 'Fundamental point: Stockholm observatory
Replaced by RT90 adjustment (datum code 6124)',
        ],
        'urn:ogc:def:datum:EPSG::6815' => [
            'name' => 'Greek (Athens)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8912',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Greece - onshore',
            'help' => 'Fundamental point: Athens Observatory. Latitude 37°58\'20.132"N, longitude 0°E (of Athens).
See geodetic datum alias 6404. Used as basis of topographic mapping based on Hatt projection.',
        ],
        'urn:ogc:def:datum:EPSG::6816' => [
            'name' => 'Carthage (Paris)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8903',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Tunisia - onshore',
            'help' => 'Fundamental point: Carthage. Latitude: 40.9464506g N, longitude: 8.8724368g E (of Paris).
Fundamental point astronomic coordinates determined in 1878.',
        ],
        'urn:ogc:def:datum:EPSG::6817' => [
            'name' => 'NGO 1948 (Oslo)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7005',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8913',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Norway - onshore',
            'help' => 'Fundamental point: Oslo observatory. Latitude: 59°54\'43.7"N, longitude: 0°00\'00.0"E (of Oslo).
',
        ],
        'urn:ogc:def:datum:EPSG::6818' => [
            'name' => 'System of the Unified Trigonometrical Cadastral Network (Ferro)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8909',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Europe - Czechoslovakia',
            'help' => 'Modification of Austrian MGI (Ferro) datum.
',
        ],
        'urn:ogc:def:datum:EPSG::6820' => [
            'name' => 'Gunung Segara (Jakarta)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8908',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Indonesia - Kalimantan E',
            'help' => 'Station P5 (Gunung Segara) 0°32\'12.83"S, 117°08\'48.47"E (of Greenwich). Longitude 8°20\'20.68"E (of Jakarta).
',
        ],
        'urn:ogc:def:datum:EPSG::6821' => [
            'name' => 'Voirol 1879 (Paris)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7011',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8903',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Algeria - north of 32°N',
            'help' => 'Fundamental point: Voirol. Latitude: 40.835864 grads N, longitude: 0.788735 grads E (of Paris).
Replaces Voirol 1875 (Paris) (code 6811).',
        ],
        'urn:ogc:def:datum:EPSG::6896' => [
            'name' => 'International Terrestrial Reference Frame 2005',
            'type' => 'dynamic geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7019',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8901',
            'conventional_rs' => null,
            'frame_reference_epoch' => 2000.0,
            'anchor_epoch' => null,
            'extent_name' => 'World',
            'help' => 'Origin at geocentre, originally orientated to the BIH Terrestrial System at epoch 1984.0 then adjusted to ensure zero net rotation to earth\'s overall tectonic motion. Defined by time series of Cartesian station coordinates for epoch 2000.0.
Realization of the IERS Terrestrial Reference System (ITRS) from September 2007. Replaces ITRF2000 (code 6656). Replaced by ITRF2008 (datum code 1061).',
        ],
        'urn:ogc:def:datum:EPSG::6901' => [
            'name' => 'Ancienne Triangulation Francaise (Paris)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7027',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8914',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'France - mainland onshore',
            'help' => '
Uses the RGS value for the Paris meridian. In Alsace, data suspected to be transformation of German network into ATF. Replaced by Nouvelle Triangulation Francaise (Paris) (code 6807) which uses the 1936 IGN value for the Paris meridian.',
        ],
        'urn:ogc:def:datum:EPSG::6903' => [
            'name' => 'Madrid 1870 (Madrid)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7028',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8905',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Spain - mainland onshore',
            'help' => 'Fundamental point: Retiro observatory, Madrid.
Replaced by ED50.',
        ],
        'urn:ogc:def:datum:EPSG::6904' => [
            'name' => 'Lisbon 1890 (Lisbon)',
            'type' => 'geodetic',
            'ellipsoid' => 'urn:ogc:def:ellipsoid:EPSG::7004',
            'prime_meridian' => 'urn:ogc:def:meridian:EPSG::8902',
            'conventional_rs' => null,
            'frame_reference_epoch' => null,
            'anchor_epoch' => null,
            'extent_name' => 'Portugal - mainland - onshore',
            'help' => 'Fundamental point: Castelo Sao Jorge, Lisbon. Latitude: 38°42\'43.631"N, longitude: 0°E (of Lisbon).
Replaced by Lisbon 1937 adjustment (which uses International 1924 ellipsoid).',
        ],
    ];

    public const DATUM_TYPE_GEODETIC = 'geodetic';

    public const DATUM_TYPE_VERTICAL = 'vertical';

    public const DATUM_TYPE_DYNAMIC_GEODETIC = 'dynamic_geodetic';

    public const DATUM_TYPE_DYNAMIC_VERTICAL = 'dynamic_vertical';

    public const DATUM_TYPE_ENGINEERING = 'engineering';

    public const DATUM_TYPE_ENSEMBLE = 'ensemble';

    /**
     * @var array<string, self>
     */
    private static array $cachedObjects = [
    ];

    protected string $datumType;

    protected ?Ellipsoid $ellipsoid;

    protected ?PrimeMeridian $primeMeridian;

    protected ?DateTimeInterface $frameReferenceEpoch;

    protected string $name;

    protected string $srid;

    public function __construct(string $datumType, ?Ellipsoid $ellipsoid, ?PrimeMeridian $primeMeridian, ?DateTimeInterface $frameReferenceEpoch, string $name = '', string $srid = '')
    {
        $this->datumType = $datumType;
        $this->ellipsoid = $ellipsoid;
        $this->primeMeridian = $primeMeridian;
        $this->frameReferenceEpoch = $frameReferenceEpoch;
        $this->name = $name;
        $this->srid = $srid;
    }

    public function getDatumType(): string
    {
        return $this->datumType;
    }

    public function getEllipsoid(): Ellipsoid
    {
        return $this->ellipsoid;

    }

    public function getPrimeMeridian(): PrimeMeridian
    {
        return $this->primeMeridian;

    }

    public function getFrameReferenceEpoch(): ?DateTimeInterface
    {
        return $this->frameReferenceEpoch;
    }

    public function getName(): string
    {
        return $this->name;
    }

    public function getSRID(): string
    {
        return $this->srid;
    }

    public static function fromSRID(string $srid): self
    {
        if (!isset(static::$sridData[$srid])) {
            throw new UnknownDatumException($srid);
        }
        if (!isset(self::$cachedObjects[$srid])) {
            $data = static::$sridData[$srid];
            $frameReferenceEpoch = null;
            if ($data['frame_reference_epoch'] instanceof DateTimeInterface) {
                $frameReferenceEpoch = $data['frame_reference_epoch'];
            } elseif ($data['frame_reference_epoch']) {
                $frameReferenceEpoch = (new Year($data['frame_reference_epoch']))->asDateTime();
            }
            if ($data['type'] === self::DATUM_TYPE_ENSEMBLE) {
                // if ensemble, use latest realisation for data
                assert(isset(self::$sridData[$srid]['ensemble']));
                $latest = self::$sridData[end(self::$sridData[$srid]['ensemble'])];
                self::$cachedObjects[$srid] = new self($data['type'], $latest['ellipsoid'] ? Ellipsoid::fromSRID($latest['ellipsoid']) : null, $latest['prime_meridian'] ? PrimeMeridian::fromSRID($latest['prime_meridian']) : null, $frameReferenceEpoch, $data['name'], $srid);
            } elseif ($data['ellipsoid'] && $data['prime_meridian']) {
                self::$cachedObjects[$srid] = new self($data['type'], Ellipsoid::fromSRID($data['ellipsoid']), PrimeMeridian::fromSRID($data['prime_meridian']), $frameReferenceEpoch, $data['name'], $srid);
            } else {
                self::$cachedObjects[$srid] = new self($data['type'], null, null, $frameReferenceEpoch, $data['name'], $srid);
            }
        }

        return self::$cachedObjects[$srid];
    }

    /**
     * @return array<string, string>
     */
    public static function getSupportedSRIDs(): array
    {
        return array_map(fn (array $data) => $data['name'], static::$sridData);
    }

    /**
     * @return array<string, array{name: string, help: string}>
     */
    public static function getSupportedSRIDsWithHelp(): array
    {
        return array_map(fn (array $data) => [
            'name' => $data['name'],
            'help' => $data['help'],
        ], static::$sridData);
    }

    public static function registerCustomDatum(string $srid, string $name, string $type, ?string $ellipsoidSrid, ?string $primeMeridianSrid, ?DateTimeInterface $frameReferenceEpoch, string $help = ''): void
    {
        self::$sridData[$srid] = [
            'name' => $name,
            'type' => $type,
            'ellipsoid' => $ellipsoidSrid,
            'prime_meridian' => $primeMeridianSrid,
            'frame_reference_epoch' => $frameReferenceEpoch,
            'help' => $help,
        ];
    }
}

dvdoug / PHPCoord

Datum::getSRID() A last analyzed 2025-01-31 22:38 UTC

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Datum::getSRID() A
last analyzed 2025-01-31 22:38 UTC
