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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 SplFileObject; |
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use SplFixedArray; |
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use function explode; |
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use function preg_match; |
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use function preg_replace; |
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use function strlen; |
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use function trim; |
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class IGNESHeightGrid extends GeographicGeoidHeightGrid |
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{ |
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use BilinearInterpolation; |
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private const ITERATION_CONVERGENCE = 0.0001; |
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private bool $coordinatesIncludedInData; |
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private int $valuesPerCoordinate; |
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private bool $precisionIncluded; |
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private SplFixedArray $data; |
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public function __construct($filename) |
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{ |
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$this->gridFile = new SplFileObject($filename); |
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$this->init(); |
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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 = ($this->numberOfRows - $latitudeIndex - 1) * $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, $record); |
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} |
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private function init(): void |
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{ |
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$headerRegexp = '^\s+(-?[\d.]+)\s+(-?[\d.]+)\s+(-?[\d.]+)\s+(-?[\d.]+)\s+([\d.]+)\s+([\d.]+)'; |
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$header = $this->gridFile->fgets(); |
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preg_match('/' . $headerRegexp . '/', $header, $headerParts); |
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$this->columnGridInterval = $headerParts[4] / 60; |
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$this->rowGridInterval = $headerParts[3] / 60; |
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$this->numberOfColumns = (int) $headerParts[6]; |
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$this->numberOfRows = (int) $headerParts[5]; |
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$this->startX = (float) $headerParts[2]; |
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if ($this->startX > 180) { |
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$this->startX -= 360; |
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} |
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$this->endX = $this->startX + ($this->numberOfColumns - 1) * $this->columnGridInterval; |
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$this->endY = (float) $headerParts[1]; |
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$this->startY = $this->endY - ($this->numberOfRows - 1) * $this->rowGridInterval; |
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// these files are not 1 record per line so direct file access is not possible. Read into memory instead :/ |
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$this->data = new SplFixedArray($this->numberOfColumns * $this->numberOfRows); |
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$rawData = $this->gridFile->fread($this->gridFile->getSize() - strlen($header)); |
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$values = explode(' ', trim(preg_replace('/\s+/', ' ', $rawData))); |
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$cursor = 0; |
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for ($i = 0, $numValues = $this->numberOfColumns * $this->numberOfRows; $i < $numValues; ++$i) { |
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$rowData = [(float) $values[$cursor]]; |
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++$cursor; |
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$this->data[$i] = $rowData; |
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} |
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} |
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} |
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dvdoug /
PHPCoord
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