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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\UnitOfMeasure\Length\Metre; |
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use SplFixedArray; |
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use function array_unique; |
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use function end; |
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use function explode; |
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use function round; |
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use function sort; |
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use function trim; |
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use function assert; |
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class BEVHeightGrid extends GeographicGeoidHeightGrid |
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{ |
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use BilinearInterpolation; |
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/** |
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* @var SplFixedArray<float> |
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*/ |
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private SplFixedArray $data; |
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public function __construct(string $filename) |
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{ |
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$this->storageOrder = self::STORAGE_ORDER_INCREASING_LONGITUDE_INCREASING_LATIITUDE; |
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$this->gridFile = new GridFile($filename); |
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// these are not rectangular!! |
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$xs = []; |
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$ys = []; |
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$this->gridFile->seek(1); |
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while ($row = $this->gridFile->fgets()) { |
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$data = explode(';', trim($row)); |
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$xs[] = (float) $data[1]; |
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$ys[] = (float) $data[0]; |
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} |
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$xs = array_unique($xs); |
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$ys = array_unique($ys); |
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sort($xs); |
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sort($ys); |
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$this->startX = $xs[0]; |
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$this->startY = $ys[0]; |
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$this->endX = (float) end($xs); |
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$this->endY = (float) end($ys); |
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$this->columnGridInterval = round($xs[1] - $xs[0], 7); |
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$this->rowGridInterval = round($ys[1] - $ys[0], 7); |
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$this->numberOfColumns = (int) (string) (($this->endX - $this->startX) / $this->columnGridInterval) + 1; |
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$this->numberOfRows = (int) (string) (($this->endY - $this->startY) / $this->rowGridInterval) + 1; |
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// init with 0 |
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$this->data = new SplFixedArray($this->numberOfColumns * $this->numberOfRows); |
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for ($i = 0, $numValues = $this->numberOfColumns * $this->numberOfRows; $i < $numValues; ++$i) { |
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$this->data[$i] = 0.0; |
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} |
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// fill in with actual values |
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$this->gridFile->seek(1); |
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while ($row = $this->gridFile->fgets()) { |
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/** @var float[] $rowData */ |
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$rowData = explode(';', trim($row)); |
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$index = (int) round((($rowData[0] - $this->startY) / $this->rowGridInterval) * $this->numberOfColumns + ($rowData[1] - $this->startX) / $this->columnGridInterval); |
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$this->data[$index] = (float) $rowData[2]; |
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} |
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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 $y): array |
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{ |
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$shift = $this->interpolate($x, $y)[0]; |
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return [new Metre($shift)]; |
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} |
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protected function getRecord(int $longitudeIndex, int $latitudeIndex): GridValues |
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{ |
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$recordId = $latitudeIndex * $this->numberOfColumns + $longitudeIndex; |
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assert($this->data[$recordId] !== null); |
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$record = $this->data[$recordId]; |
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$longitude = $longitudeIndex * $this->columnGridInterval + $this->startX; |
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$latitude = $latitudeIndex * $this->rowGridInterval + $this->startY; |
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return new GridValues($longitude, $latitude, [$record]); |
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} |
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} |
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dvdoug /
PHPCoord
