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<?php |
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/* |
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* This file is part of the Geotools library. |
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* |
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* (c) Antoine Corcy <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\Geotools\Coordinate; |
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use League\Geotools\Exception\InvalidArgumentException; |
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use League\Geotools\Exception\NotMatchingEllipsoidException; |
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/** |
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* Ellipsoid class |
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* |
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* @author Antoine Corcy <[email protected]> |
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* |
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* @see http://en.wikipedia.org/wiki/Reference_ellipsoid |
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* @see http://www.colorado.edu/geography/gcraft/notes/datum/gif/ellipse.gif |
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*/ |
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class Ellipsoid |
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{ |
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/** |
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* List of selected reference ellipsoids. |
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* |
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* @var string |
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*/ |
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const AIRY = 'AIRY'; |
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const AUSTRALIAN_NATIONAL = 'AUSTRALIAN_NATIONAL'; |
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const BESSEL_1841 = 'BESSEL_1841'; |
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const BESSEL_1841_NAMBIA = 'BESSEL_1841_NAMBIA'; |
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const CLARKE_1866 = 'CLARKE_1866'; |
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const CLARKE_1880 = 'CLARKE_1880'; |
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const EVEREST = 'EVEREST'; |
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const FISCHER_1960_MERCURY = 'FISCHER_1960_MERCURY'; |
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const FISCHER_1968 = 'FISCHER_1968'; |
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const GRS_1967 = 'GRS_1967'; |
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const GRS_1980 = 'GRS_1980'; |
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const HELMERT_1906 = 'HELMERT_1906'; |
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const HOUGH = 'HOUGH'; |
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const INTERNATIONAL = 'INTERNATIONAL'; |
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const KRASSOVSKY = 'KRASSOVSKY'; |
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const MODIFIED_AIRY = 'MODIFIED_AIRY'; |
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const MODIFIED_EVEREST = 'MODIFIED_EVEREST'; |
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const MODIFIED_FISCHER_1960 = 'MODIFIED_FISCHER_1960'; |
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const SOUTH_AMERICAN_1969 = 'SOUTH_AMERICAN_1969'; |
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const WGS60 = 'WGS60'; |
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const WGS66 = 'WGS66'; |
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const WGS72 = 'WGS72'; |
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const WGS84 = 'WGS84'; |
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/** |
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* The name of the Ellipsoid. |
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* |
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* @var string |
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*/ |
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protected $name; |
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/** |
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* The semi-major axis (equatorial radius) in meters. |
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* @see http://en.wikipedia.org/wiki/Earth_radius |
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* @see http://home.online.no/~sigurdhu/WGS84_Eng.html |
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* |
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* @var double |
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*/ |
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protected $a; |
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/** |
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* The inverse flattening. |
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* @see http://home.online.no/~sigurdhu/WGS84_Eng.html |
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* |
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* @var double |
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*/ |
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protected $invF; |
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/** |
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* Selected reference ellipsoids. |
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* Source: Defense Mapping Agency. 1987b. Washington, DC: Defense Mapping Agency |
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* DMA Technical Report: Supplement to Department of Defense World Geodetic System 1984 Technical Report. |
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* @see http://en.wikipedia.org/wiki/Geodetic_datum |
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* @see http://www.colorado.edu/geography/gcraft/notes/datum/gif/refellip.gif |
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* |
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* @var array |
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*/ |
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protected static $referenceEllipsoids = array( |
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self::AIRY => array( |
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'name' => 'Airy', |
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'a' => 6377563.396, |
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'invF' => 299.3249646, |
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), |
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self::AUSTRALIAN_NATIONAL => array( |
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'name' => 'Australian National', |
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'a' => 6378160.0, |
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'invF' => 298.25, |
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), |
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self::BESSEL_1841 => array( |
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'name' => 'Bessel 1841', |
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'a' => 6377397.155, |
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'invF' => 299.1528128, |
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), |
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self::BESSEL_1841_NAMBIA => array( |
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'name' => 'Bessel 1841 (Nambia)', |
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'a' => 6377483.865, |
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'invF' => 299.1528128, |
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), |
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self::CLARKE_1866 => array( |
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'name' => 'Clarke 1866', |
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'a' => 6378206.4, |
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'invF' => 294.9786982, |
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), |
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self::CLARKE_1880 => array( |
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'name' => 'Clarke 1880', |
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'a' => 6378249.145, |
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'invF' => 293.465, |
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), |
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self::EVEREST => array( |
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'name' => 'Everest', |
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'a' => 6377276.345, |
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'invF' => 300.8017, |
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), |
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self::FISCHER_1960_MERCURY => array( |
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'name' => 'Fischer 1960 (Mercury)', |
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'a' => 6378166.0, |
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'invF' => 298.3, |
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), |
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self::FISCHER_1968 => array( |
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'name' => 'Fischer 1968', |
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'a' => 6378150.0, |
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'invF' => 298.3, |
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), |
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self::GRS_1967 => array( |
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'name' => 'GRS 1967', |
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'a' => 6378160.0, |
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'invF' => 298.247167427, |
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), |
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self::GRS_1980 => array( |
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'name' => 'GRS 1980', |
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'a' => 6378137, |
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'invF' => 298.257222101, |
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), |
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self::HELMERT_1906 => array( |
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'name' => 'Helmert 1906', |
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'a' => 6378200.0, |
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'invF' => 298.3, |
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), |
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self::HOUGH => array( |
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'name' => 'Hough', |
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'a' => 6378270.0, |
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'invF' => 297.0, |
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), |
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self::INTERNATIONAL => array( |
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'name' => 'International', |
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'a' => 6378388.0, |
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'invF' => 297.0, |
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), |
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self::KRASSOVSKY => array( |
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'name' => 'Krassovsky', |
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'a' => 6378245.0, |
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'invF' => 298.3, |
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), |
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self::MODIFIED_AIRY => array( |
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'name' => 'Modified Airy', |
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'a' => 6377340.189, |
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'invF' => 299.3249646, |
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), |
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self::MODIFIED_EVEREST => array( |
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'name' => 'Modified Everest', |
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'a' => 6377304.063, |
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'invF' => 300.8017, |
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), |
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self::MODIFIED_FISCHER_1960 => array( |
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'name' => 'Modified Fischer 1960', |
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'a' => 6378155.0, |
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'invF' => 298.3, |
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), |
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self::SOUTH_AMERICAN_1969 => array( |
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'name' => 'South American 1969', |
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'a' => 6378160.0, |
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'invF' => 298.25, |
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), |
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self::WGS60 => array( |
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'name' => 'WGS 60', |
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'a' => 6378165.0, |
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'invF' => 298.3, |
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), |
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self::WGS66 => array( |
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'name' => 'WGS 66', |
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'a' => 6378145.0, |
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'invF' => 298.25, |
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), |
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self::WGS72 => array( |
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'name' => 'WGS 72', |
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'a' => 6378135.0, |
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'invF' => 298.26, |
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), |
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self::WGS84 => array( |
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'name' => 'WGS 84', |
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'a' => 6378136.0, |
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'invF' => 298.257223563, |
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), |
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); |
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/** |
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* Create a new ellipsoid. |
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* |
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* @param string $name The name of the ellipsoid to create. |
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* @param double $a The semi-major axis (equatorial radius) in meters. |
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* @param double $invF The inverse flattening. |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public function __construct($name, $a, $invF) |
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{ |
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if (0.0 >= (double) $invF) { |
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throw new InvalidArgumentException('The inverse flattening cannot be negative or equal to zero !'); |
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} |
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$this->name = $name; |
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$this->a = $a; |
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$this->invF = $invF; |
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} |
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/** |
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* Create the ellipsoid chosen by its name. |
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* |
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* @param string $name The name of the ellipsoid to create (optional). |
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* |
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* @return Ellipsoid |
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*/ |
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public static function createFromName($name = self::WGS84) |
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{ |
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$name = trim($name); |
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if (empty($name)) { |
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throw new InvalidArgumentException('Please provide an ellipsoid name !'); |
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} |
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if (!array_key_exists($name, self::$referenceEllipsoids)) { |
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throw new InvalidArgumentException( |
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sprintf('%s ellipsoid does not exist in selected reference ellipsoids !', $name) |
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); |
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} |
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return self::createFromArray(self::$referenceEllipsoids[$name]); |
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} |
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/** |
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* Create an ellipsoid from an array. |
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* |
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* @param array $newEllipsoid The ellipsoid's parameters to create. |
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* |
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* @return Ellipsoid |
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*/ |
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public static function createFromArray(array $newEllipsoid) |
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{ |
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if (!isset($newEllipsoid['name']) || !isset($newEllipsoid['a']) || !isset($newEllipsoid['invF']) |
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|| 3 !== count($newEllipsoid)) { |
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throw new InvalidArgumentException('Ellipsoid arrays should contain `name`, `a` and `invF` keys !'); |
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} |
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return new self($newEllipsoid['name'], $newEllipsoid['a'], $newEllipsoid['invF']); |
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} |
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/** |
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* Check if coordinates have the same ellipsoid. |
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* |
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* @param CoordinateInterface $a A coordinate. |
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* @param CoordinateInterface $b A coordinate. |
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* |
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* @throws NotMatchingEllipsoidException |
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*/ |
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public static function checkCoordinatesEllipsoid(CoordinateInterface $a, CoordinateInterface $b) |
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{ |
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if ($a->getEllipsoid() != $b->getEllipsoid()) { |
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throw new NotMatchingEllipsoidException('The ellipsoids for both coordinates must match !'); |
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} |
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} |
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/** |
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* Returns the ellipsoid's name. |
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* |
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* @return string |
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*/ |
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public function getName() |
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{ |
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return $this->name; |
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} |
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/** |
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* Returns the semi-major axis (equatorial radius) in meters. |
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* |
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* @return double |
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*/ |
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public function getA() |
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{ |
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return (double) $this->a; |
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} |
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/** |
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* Computes and returns the semi-minor axis (polar distance) in meters. |
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* @see http://home.online.no/~sigurdhu/WGS84_Eng.html |
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* |
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* @return double |
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*/ |
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public function getB() |
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{ |
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return (double) $this->a * (1 - 1 / $this->invF); |
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} |
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/** |
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* Returns the inverse flattening. |
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* |
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* @return double |
|
319
|
|
|
*/ |
|
320
|
23 |
|
public function getInvF() |
|
321
|
|
|
{ |
|
322
|
23 |
|
return (double) $this->invF; |
|
323
|
|
|
} |
|
324
|
|
|
|
|
325
|
|
|
/** |
|
326
|
|
|
* Computes and returns the arithmetic mean radius in meters. |
|
327
|
|
|
* @see http://home.online.no/~sigurdhu/WGS84_Eng.html |
|
328
|
|
|
* |
|
329
|
|
|
* @return double |
|
330
|
|
|
*/ |
|
331
|
5 |
|
public function getArithmeticMeanRadius() |
|
332
|
|
|
{ |
|
333
|
5 |
|
return (double) $this->a * (1 - 1 / $this->invF / 3); |
|
334
|
|
|
} |
|
335
|
|
|
|
|
336
|
|
|
/** |
|
337
|
|
|
* Returns the list of available ellipsoids sorted by alphabetical order. |
|
338
|
|
|
* |
|
339
|
|
|
* @return string The list of available ellipsoids comma separated. |
|
340
|
|
|
*/ |
|
341
|
110 |
|
public static function getAvailableEllipsoidNames() |
|
342
|
|
|
{ |
|
343
|
110 |
|
ksort(self::$referenceEllipsoids); |
|
344
|
|
|
|
|
345
|
110 |
|
return implode(', ', array_keys(self::$referenceEllipsoids)); |
|
346
|
|
|
} |
|
347
|
|
|
} |
|
348
|
|
|
|