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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 assert; |
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use function explode; |
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use const PHP_MAJOR_VERSION; |
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use PHPCoord\CoordinateReferenceSystem\Geographic; |
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use PHPCoord\GeographicPoint; |
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use PHPCoord\UnitOfMeasure\Angle\Angle; |
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use PHPCoord\UnitOfMeasure\Length\Metre; |
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use function preg_replace; |
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use SplFileObject; |
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use function str_replace; |
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use function trim; |
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class IGNGeocentricTranslationGrid extends SplFileObject |
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{ |
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private const ITERATION_CONVERGENCE = 0.0001; |
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private float $lowerLatitudeLimit; |
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private float $upperLatitudeLimit; |
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private float $lowerLongitudeLimit; |
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private float $upperLongitudeLimit; |
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private float $latitudeGridInterval; |
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private float $longitudeGridInterval; |
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public function __construct($filename) |
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{ |
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parent::__construct($filename); |
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$this->readHeader(); |
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} |
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public function applyForwardAdjustment(GeographicPoint $point, Geographic $to): GeographicPoint |
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{ |
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[$tx, $ty, $tz] = $this->getAdjustment($point->getLatitude(), $point->getLongitude()); |
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return $point->geocentricTranslation( |
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$to, |
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$tx, |
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$ty, |
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$tz, |
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); |
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} |
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public function applyReverseAdjustment(GeographicPoint $point, Geographic $to): GeographicPoint |
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{ |
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$adjustment = [new Metre(0), new Metre(0), new Metre(0)]; |
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$latitude = $point->getLatitude(); |
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$longitude = $point->getLongitude(); |
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do { |
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$prevAdjustment = $adjustment; |
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$adjustment = $this->getAdjustment($latitude, $longitude); |
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$newPoint = $point->geocentricTranslation( |
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$to, |
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$adjustment[0]->multiply(-1), |
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$adjustment[1]->multiply(-1), |
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$adjustment[2]->multiply(-1), |
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); |
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$latitude = $newPoint->getLatitude(); |
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$longitude = $newPoint->getLongitude(); |
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} while (abs($adjustment[0]->subtract($prevAdjustment[0])->getValue()) > self::ITERATION_CONVERGENCE && abs($adjustment[1]->subtract($prevAdjustment[1])->getValue()) > self::ITERATION_CONVERGENCE && abs($adjustment[2]->subtract($prevAdjustment[2])->getValue()) > self::ITERATION_CONVERGENCE); |
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return $newPoint; |
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} |
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/** |
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* @return Metre[] |
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*/ |
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private function getAdjustment(Angle $latitude, Angle $longitude): array |
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{ |
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$latitudeIndex = (int) (string) (($latitude->getValue() - $this->lowerLatitudeLimit) / $this->latitudeGridInterval); |
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$longitudeIndex = (int) (string) (($longitude->getValue() - $this->lowerLongitudeLimit) / $this->longitudeGridInterval); |
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$corner0 = $this->getRecord($latitudeIndex, $longitudeIndex); |
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$corner1 = $this->getRecord($latitudeIndex + 1, $longitudeIndex); |
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$corner2 = $this->getRecord($latitudeIndex + 1, $longitudeIndex + 1); |
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$corner3 = $this->getRecord($latitudeIndex, $longitudeIndex + 1); |
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$dLatitude = $latitude->getValue() - $corner0[2]; |
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$dLongitude = $longitude->getValue() - $corner0[1]; |
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$t = $dLatitude / $this->latitudeGridInterval; |
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$u = $dLongitude / $this->longitudeGridInterval; |
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$tx = (1 - $t) * (1 - $u) * $corner0[3] + ($t) * (1 - $u) * $corner1[3] + ($t) * ($u) * $corner2[3] + (1 - $t) * ($u) * $corner3[3]; |
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$ty = (1 - $t) * (1 - $u) * $corner0[4] + ($t) * (1 - $u) * $corner1[4] + ($t) * ($u) * $corner2[4] + (1 - $t) * ($u) * $corner3[4]; |
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$tz = (1 - $t) * (1 - $u) * $corner0[5] + ($t) * (1 - $u) * $corner1[5] + ($t) * ($u) * $corner2[5] + (1 - $t) * ($u) * $corner3[5]; |
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return [new Metre($tx), new Metre($ty), new Metre($tz)]; |
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} |
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private function getRecord(int $latitudeIndex, int $longitudeIndex): array |
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{ |
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$latitudesPerLongitude = (int) (string) (($this->upperLatitudeLimit - $this->lowerLatitudeLimit) / $this->latitudeGridInterval); |
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$record = ($longitudeIndex * ($latitudesPerLongitude + 1) + $latitudeIndex + 4); |
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// https://bugs.php.net/bug.php?id=62004 |
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if (PHP_MAJOR_VERSION < 8) { |
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--$record; |
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} |
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$this->seek($record); |
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return explode(' ', trim(preg_replace('/ +/', ' ', $this->fgets()))); |
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} |
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private function readHeader(): void |
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{ |
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$header0 = $this->fgets(); |
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$header1 = $this->fgets(); |
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$header2 = $this->fgets(); |
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$header3 = $this->fgets(); |
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$interpolationMethod = trim(str_replace('GR3D2', '', $header2)); |
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assert($interpolationMethod === 'INTERPOLATION BILINEAIRE'); |
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$gridDimensions = explode(' ', trim(preg_replace('/ +/', ' ', str_replace('GR3D1', '', $header1)))); |
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$this->lowerLongitudeLimit = (float) $gridDimensions[0]; |
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$this->upperLongitudeLimit = (float) $gridDimensions[1]; |
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$this->lowerLatitudeLimit = (float) $gridDimensions[2]; |
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$this->upperLatitudeLimit = (float) $gridDimensions[3]; |
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$this->longitudeGridInterval = (float) $gridDimensions[4]; |
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$this->latitudeGridInterval = (float) $gridDimensions[5]; |
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} |
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} |
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dvdoug /
PHPCoord
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