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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 explode; |
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use function max; |
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use function min; |
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use const PHP_FLOAT_MAX; |
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use const PHP_FLOAT_MIN; |
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use PHPCoord\UnitOfMeasure\Length\Metre; |
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use function round; |
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use SplFileObject; |
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use SplFixedArray; |
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use function str_replace; |
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use function trim; |
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class GUGiKHeightGrid extends GeographicGeoidHeightGrid |
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{ |
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use BilinearInterpolation; |
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private SplFixedArray $data; |
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public function __construct($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 SplFileObject($filename); |
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$this->columnGridInterval = 0.01; // always |
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$this->rowGridInterval = 0.01; // always |
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// these files have variable length headers, and then are not rectangular!! |
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do { |
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$headerLine = str_replace(self::BOM, '', $this->gridFile->fgets()); |
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} while ($headerLine && $headerLine[0] === '#'); |
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$firstDataRowIndex = $this->gridFile->key() + 1; |
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$startX = PHP_FLOAT_MAX; |
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$endX = PHP_FLOAT_MIN; |
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$startY = PHP_FLOAT_MAX; |
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$endY = PHP_FLOAT_MIN; |
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while ($row = $this->gridFile->fgets()) { |
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$data = explode("\t", trim($row)); |
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$startX = min($startX, (float) $data[1]); |
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$endX = max($endX, (float) $data[1]); |
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$startY = min($startY, (float) $data[0]); |
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$endY = max($endY, (float) $data[0]); |
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} |
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$this->startX = $startX; |
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$this->startY = $startY; |
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$this->numberOfColumns = (int) (string) (($endX - $startX) / $this->columnGridInterval) + 1; |
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$this->numberOfRows = (int) (string) (($endY - $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; |
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} |
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// fill in with actual values |
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$this->gridFile->seek($firstDataRowIndex); |
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while ($row = $this->gridFile->fgets()) { |
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$rowData = explode("\t", trim($row)); |
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$index = round((($rowData[0] - $this->startY) / $this->rowGridInterval) * $this->numberOfColumns + ($rowData[1] - $this->startX) / $this->columnGridInterval); |
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$this->data[$index] = (float) $rowData[2]; |
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} |
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} |
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/** |
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* @return Metre[] |
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*/ |
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public function getValues($x, $y): array |
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{ |
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$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 + $longitudeIndex; |
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$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
