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<?php |
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/** |
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* PHPCoord. |
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* |
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* @author Doug Wright |
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*/ |
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declare(strict_types=1); |
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namespace PHPCoord\CoordinateOperation; |
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use function abs; |
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use function atan2; |
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use function cos; |
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use PHPCoord\Datum\Datum; |
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use PHPCoord\UnitOfMeasure\Angle\Radian; |
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use PHPCoord\UnitOfMeasure\Length\Length; |
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use PHPCoord\UnitOfMeasure\Length\Metre; |
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use function sin; |
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use function sqrt; |
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/** |
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* A geocentric point w/out a CRS. |
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* @internal |
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*/ |
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class GeocentricValue |
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{ |
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protected const NEWTON_RAPHSON_CONVERGENCE = 1e-16; |
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private Metre$x; |
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private Metre $y; |
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private Metre $z; |
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private Datum $datum; |
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public function __construct(Length $x, Length $y, Length $z, Datum $datum) |
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{ |
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$this->x = $x->asMetres(); |
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$this->y = $y->asMetres(); |
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$this->z = $z->asMetres(); |
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$this->datum = $datum; |
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} |
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public function getX(): Metre |
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{ |
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return $this->x; |
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} |
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public function getY(): Metre |
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{ |
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return $this->y; |
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} |
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public function getZ(): Metre |
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{ |
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return $this->z; |
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} |
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public function asGeographicValue(): GeographicValue |
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{ |
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$a = $this->datum->getEllipsoid()->getSemiMajorAxis()->asMetres()->getValue(); |
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$e2 = $this->datum->getEllipsoid()->getEccentricitySquared(); |
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$x = $this->x->getValue(); |
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$y = $this->y->getValue(); |
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$z = $this->z->getValue(); |
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$longitude = atan2($y, $x); |
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$p = sqrt(($x ** 2) + ($y ** 2)); |
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$latitude = atan2($z, ($p * (1 - $e2))); |
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do { |
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$phi1 = $latitude; |
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$v = $a / sqrt(1 - $e2 * (sin($latitude) ** 2)); |
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$latitude = atan2($z + ($e2 * $v * sin($latitude)), $p); |
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} while (abs($latitude - $phi1) >= self::NEWTON_RAPHSON_CONVERGENCE); |
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$latitude += $this->datum->getPrimeMeridian()->getGreenwichLongitude()->asRadians()->getValue(); |
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$h = $p / cos($latitude) - $v; |
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return new GeographicValue(new Radian($latitude), new Radian($longitude), new Metre($h), $this->datum); |
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} |
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} |
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dvdoug /
PHPCoord
