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<?php |
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/** |
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* PHPCoord |
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* @package PHPCoord |
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* @author Jonathan Stott |
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* @author Doug Wright |
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*/ |
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namespace PHPCoord; |
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/** |
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* Reference ellipsoid |
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* @author Jonathan Stott |
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* @author Doug Wright |
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* @package PHPCoord |
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*/ |
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class RefEll |
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{ |
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/** |
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* Major axis |
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* @var float |
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*/ |
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protected $maj; |
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/** |
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* Minor axis |
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* @var float |
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*/ |
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protected $min; |
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/** |
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* Eccentricity |
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* @var float |
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*/ |
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protected $ecc; |
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/** |
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* Create a new RefEll object to represent a reference ellipsoid |
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* |
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* @param float $maj the major axis |
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* @param float $min the minor axis |
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*/ |
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public function __construct($maj, $min) |
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{ |
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$this->maj = $maj; |
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$this->min = $min; |
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$this->ecc = (($maj * $maj) - ($min * $min)) / ($maj * $maj); |
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} |
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/** |
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* @return float |
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*/ |
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public function getMaj() |
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{ |
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return $this->maj; |
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} |
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/** |
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* @return float |
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*/ |
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public function getMin() |
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{ |
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return $this->min; |
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} |
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/** |
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* @return float |
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*/ |
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public function getEcc() |
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{ |
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return $this->ecc; |
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} |
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/** |
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* Helper function to create Airy1830 ellipsoid used in GB |
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* @return RefEll |
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*/ |
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public static function airy1830() |
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{ |
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return new RefEll(6377563.396, 6356256.909); |
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} |
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/** |
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* Helper function to create Airy Modified ellipsoid used by Ireland |
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* @return RefEll |
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*/ |
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public static function airyModified() |
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{ |
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return new RefEll(6377340.189, 6356034.447); |
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} |
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/** |
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* Helper function to create WGS84 ellipsoid |
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* @return RefEll |
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*/ |
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public static function wgs84() |
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{ |
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return new RefEll(6378137, 6356752.314245); |
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} |
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/** |
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* Helper function to create GRS80 ellipsoid |
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* @return RefEll |
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*/ |
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public static function grs80() |
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{ |
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return new RefEll(6378137, 6356752.314140); |
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} |
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/** |
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* Helper function to create Clarke1866 ellipsoid |
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* @return RefEll |
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*/ |
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public static function clarke1866() |
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{ |
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return new RefEll(6378206.4, 6356583.8); |
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} |
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/** |
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* Helper function to create International 1924 (Heyford) ellipsoid |
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* @return RefEll |
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*/ |
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public static function international1924() |
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{ |
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return new RefEll(6378388.0, 6356911.9); |
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} |
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/** |
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* Helper function to create International 1924 (Heyford) ellipsoid |
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* @return RefEll |
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*/ |
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public static function heyford1924() |
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{ |
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return new RefEll(6378388.0, 6356911.9); |
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} |
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/** |
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* Helper function to create Bessel 1841 ellipsoid |
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* @return RefEll |
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*/ |
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public static function bessel1841() |
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{ |
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return new RefEll(6377397.155, 6356078.963); |
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} |
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} |
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dvdoug /
PHPCoord
