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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; |
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use PHPCoord\CoordinateReferenceSystem\CoordinateReferenceSystem; |
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use PHPCoord\CoordinateReferenceSystem\Geographic2D; |
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use PHPCoord\CoordinateReferenceSystem\Geographic3D; |
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use PHPCoord\CoordinateSystem\Axis; |
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use PHPCoord\Datum\Ellipsoid; |
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use PHPCoord\Exception\InvalidCoordinateReferenceSystemException; |
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use PHPCoord\Exception\UnknownAxisException; |
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use PHPCoord\UnitOfMeasure\Angle\Angle; |
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use PHPCoord\UnitOfMeasure\Length\Length; |
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use PHPCoord\UnitOfMeasure\Length\Metre; |
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use PHPCoord\UnitOfMeasure\UnitOfMeasureFactory; |
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use TypeError; |
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/** |
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* Coordinate representing a point on an ellipsoid. |
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* @author Doug Wright |
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*/ |
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class GeographicPoint extends Point |
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{ |
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/** |
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* Latitude. |
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* @var Angle |
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*/ |
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protected $latitude; |
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/** |
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* Longitude. |
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* @var Angle |
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*/ |
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protected $longitude; |
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/** |
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* Height above ellipsoid (N.B. *not* height above ground, sea-level or anything else tangible). |
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* @var ?Length |
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*/ |
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protected $height; |
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/** |
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* Coordinate reference system. |
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* @var CoordinateReferenceSystem |
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*/ |
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protected $crs; |
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/** |
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* Constructor. |
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* @param Angle $latitude refer to CRS for preferred unit of measure, but any angle unit accepted |
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* @param Angle $longitude refer to CRS for preferred unit of measure, but any angle unit accepted |
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* @param ?Length $height refer to CRS for preferred unit of measure, but any length unit accepted |
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* @param Geographic2D|Geographic3D $crs |
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*/ |
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public function __construct(Angle $latitude, Angle $longitude, ?Length $height, CoordinateReferenceSystem $crs) |
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{ |
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if (!$crs instanceof Geographic2D && !$crs instanceof Geographic3D) { |
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throw new TypeError(sprintf("A geographic point must be associated with a geographic CRS, but a '%s' CRS was given", get_class($crs))); |
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} |
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if ($crs instanceof Geographic2D && $height !== null) { |
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throw new InvalidCoordinateReferenceSystemException('A 2D geographic point must not include a height'); |
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} |
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if ($crs instanceof Geographic3D && $height === null) { |
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throw new InvalidCoordinateReferenceSystemException('A 3D geographic point must include a height, none given'); |
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} |
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$this->crs = $crs; |
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$this->latitude = UnitOfMeasureFactory::convertAngle($latitude, $this->getAxisByName(Axis::GEODETIC_LATITUDE)->getUnitOfMeasureId()); |
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$this->longitude = UnitOfMeasureFactory::convertAngle($longitude, $this->getAxisByName(Axis::GEODETIC_LONGITUDE)->getUnitOfMeasureId()); |
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if ($height) { |
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$this->height = UnitOfMeasureFactory::convertLength($height, $this->getAxisByName(Axis::ELLIPSOIDAL_HEIGHT)->getUnitOfMeasureId()); |
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} |
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} |
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public function getLatitude(): Angle |
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{ |
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return $this->latitude; |
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} |
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public function getLongitude(): Angle |
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{ |
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return $this->longitude; |
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} |
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public function getHeight(): ?Length |
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{ |
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return $this->height; |
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} |
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public function getCRS(): CoordinateReferenceSystem |
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{ |
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return $this->crs; |
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} |
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/** |
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* Calculate surface distance between two points. |
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*/ |
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public function calculateSurfaceDistance(Point $to): Length |
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{ |
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if ($to->getCRS()->getEpsgCode() !== $this->crs->getEpsgCode()) { |
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throw new \InvalidArgumentException('Can only calculate distances between two points in the same CRS'); |
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} |
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//Mean radius definition taken from Wikipedia |
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/** @var Ellipsoid $ellipsoid */ |
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$ellipsoid = $this->getCRS()->getDatum()->getEllipsoid(); |
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$radius = ((2 * $ellipsoid->getSemiMajorAxis()->asMetres()->getValue()) + $ellipsoid->getSemiMinorAxis()->asMetres()->getValue()) / 3; |
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return new Metre(acos(sin($this->latitude->asRadians()->getValue()) * sin($to->latitude->asRadians()->getValue()) + cos($this->latitude->asRadians()->getValue()) * cos($to->latitude->asRadians()->getValue()) * cos($to->longitude->asRadians()->getValue() - $this->longitude->asRadians()->getValue())) * $radius); |
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} |
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public function __toString(): string |
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{ |
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$values = []; |
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foreach ($this->getCRS()->getCoordinateSystem()->getAxes() as $axis) { |
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if ($axis->getName() === Axis::GEODETIC_LATITUDE) { |
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$values[] = $this->latitude; |
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} elseif ($axis->getName() === Axis::GEODETIC_LONGITUDE) { |
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$values[] = $this->longitude; |
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} elseif ($axis->getName() === Axis::ELLIPSOIDAL_HEIGHT) { |
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$values[] = $this->height; |
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} else { |
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throw new UnknownAxisException(); // @codeCoverageIgnore |
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} |
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} |
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return '(' . implode(', ', $values) . ')'; |
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} |
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} |
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dvdoug /
PHPCoord
