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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\Degree; |
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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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use BilinearInterpolation; |
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private const ITERATION_CONVERGENCE = 0.0001; |
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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()->asDegrees(), $point->getLongitude()->asDegrees()); |
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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->asDegrees(), $longitude->asDegrees()); |
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$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(Degree $latitude, Degree $longitude): array |
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{ |
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$offsets = $this->interpolateBilinear($longitude->getValue(), $latitude->getValue()); |
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return [new Metre($offsets[0]), new Metre($offsets[1]), new Metre($offsets[2])]; |
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} |
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private function getRecord(int $longitudeIndex, int $latitudeIndex): GridValues |
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{ |
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$record = ($longitudeIndex * ($this->numberOfRows + 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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$rawData = explode(' ', trim(preg_replace('/ +/', ' ', $this->fgets()))); |
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return new GridValues((float) $rawData[1], (float) $rawData[2], [(float) $rawData[3], (float) $rawData[4], (float) $rawData[5]]); |
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} |
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private function readHeader(): void |
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{ |
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$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->startX = (float) $gridDimensions[0]; |
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$this->endX = (float) $gridDimensions[1]; |
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$this->startY = (float) $gridDimensions[2]; |
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$this->endY = (float) $gridDimensions[3]; |
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$this->columnGridInterval = (float) $gridDimensions[4]; |
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$this->rowGridInterval = (float) $gridDimensions[5]; |
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$this->numberOfColumns = (int) (string) (($this->endX - $this->startX) / $this->columnGridInterval); |
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$this->numberOfRows = (int) (string) (($this->endY - $this->startY) / $this->rowGridInterval); |
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} |
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} |
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dvdoug /
PHPCoord
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