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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 PHPCoord\CoordinateReferenceSystem\Projected; |
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use PHPCoord\CoordinateSystem\Cartesian; |
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use PHPCoord\Datum\Datum; |
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use PHPCoord\Point\ProjectedPoint; |
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use PHPCoord\UnitOfMeasure\Length\Metre; |
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use function abs; |
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class OSTNOSGM15Grid extends Grid |
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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(string $filename) |
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{ |
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$this->gridFile = new GridFile($filename); |
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$this->startX = 0; |
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$this->startY = 0; |
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$this->columnGridInterval = 1000; |
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$this->rowGridInterval = 1000; |
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$this->numberOfColumns = 700; |
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$this->numberOfRows = 1250; |
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} |
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public function applyForwardHorizontalAdjustment(ProjectedPoint $point): ProjectedPoint |
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{ |
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$adjustment = $this->getValues($point->getEasting()->asMetres()->getValue(), $point->getNorthing()->asMetres()->getValue()); |
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$easting = $point->getEasting()->add($adjustment[0]); |
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$northing = $point->getNorthing()->add($adjustment[1]); |
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return ProjectedPoint::createFromEastingNorthing(Projected::fromSRID(Projected::EPSG_OSGB36_BRITISH_NATIONAL_GRID), $easting, $northing, $point->getCoordinateEpoch()); |
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} |
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public function applyReverseHorizontalAdjustment(ProjectedPoint $point): ProjectedPoint |
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{ |
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$osgb36NationalGrid = Projected::fromSRID(Projected::EPSG_OSGB36_BRITISH_NATIONAL_GRID); |
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$etrs89NationalGrid = new Projected( |
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'ETRS89 / National Grid', |
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Cartesian::fromSRID(Cartesian::EPSG_2D_AXES_EASTING_NORTHING_E_N_ORIENTATIONS_EAST_NORTH_UOM_M), |
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Datum::fromSRID(Datum::EPSG_EUROPEAN_TERRESTRIAL_REFERENCE_SYSTEM_1989_ENSEMBLE), |
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$osgb36NationalGrid->getBoundingArea() |
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); |
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$adjustment = [new Metre(0), new Metre(0)]; |
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$easting = $point->getEasting(); |
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$northing = $point->getNorthing(); |
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do { |
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$prevAdjustment = $adjustment; |
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$adjustment = $this->getValues($easting->asMetres()->getValue(), $northing->asMetres()->getValue()); |
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$easting = $point->getEasting()->subtract($adjustment[0]); |
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$northing = $point->getNorthing()->subtract($adjustment[1]); |
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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); |
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return ProjectedPoint::createFromEastingNorthing($etrs89NationalGrid, $easting, $northing, $point->getCoordinateEpoch()); |
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} |
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public function getHeightAdjustment(ProjectedPoint $point): Metre |
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{ |
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$adjustment = $this->getValues($point->getEasting()->asMetres()->getValue(), $point->getNorthing()->asMetres()->getValue()); |
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return $adjustment[2]; |
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} |
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/** |
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* @return Metre[] |
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*/ |
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public function getValues(float $x, float $y): array |
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{ |
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$offsets = $this->interpolate($x, $y); |
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return [new Metre($offsets[0]), new Metre($offsets[1]), new Metre($offsets[2])]; |
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} |
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private function getRecord(int $eastIndex, int $northIndex): GridValues |
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{ |
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$record = $northIndex * 701 + $eastIndex + 1; |
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$this->gridFile->seek($record); |
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/** @var array<int, string> $rawData */ |
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$rawData = $this->gridFile->fgetcsv(); |
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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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} |
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dvdoug /
PHPCoord
This check looks for private methods that have been defined, but are not used inside the class.