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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 assert; |
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use function explode; |
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use function intdiv; |
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use function preg_replace; |
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use function preg_split; |
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use function trim; |
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use function unpack; |
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/** |
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* @see https://github.com/Kortforsyningen/kmsgrid/blob/master/kmsgrid.py for documentation |
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*/ |
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class KMSGrid extends GeographicGeoidHeightGrid |
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{ |
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use BilinearInterpolation; |
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private int $binaryHeaderLength = 64; |
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private bool $isBinary; |
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private string $integerFormatChar = 'V'; |
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private string $doubleFormatChar = 'e'; |
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private string $floatFormatChar = 'g'; |
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private SplFixedArray $textData; |
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public function __construct($filename) |
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{ |
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$this->gridFile = new SplFileObject($filename); |
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$this->storageOrder = self::STORAGE_ORDER_INCREASING_LONGITUDE_DECREASING_LATIITUDE; |
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$firstChar = $this->gridFile->fread(1); |
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if ($firstChar === ' ') { |
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$this->isBinary = false; |
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$header = preg_split('/\s+/', trim($this->gridFile->fgets())); |
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$this->startX = (float) $header[2]; |
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$this->startY = (float) $header[0]; |
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$this->endX = (float) $header[3]; |
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$this->endY = (float) $header[1]; |
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$this->columnGridInterval = (float) $header[5]; |
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$this->rowGridInterval = (float) $header[4]; |
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$this->numberOfColumns = (int) (string) (($this->endX - $this->startX) / $this->columnGridInterval) + 1; |
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$this->numberOfRows = (int) (string) (($this->endY - $this->startY) / $this->rowGridInterval) + 1; |
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$this->textData = new SplFixedArray($this->numberOfColumns * $this->numberOfRows); |
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$index = 0; |
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while (!$this->gridFile->eof()) { |
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$rawData = trim($this->gridFile->fgets()); |
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if ($rawData) { |
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$values = explode(' ', trim(preg_replace('/\s+/', ' ', $rawData))); |
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foreach ($values as $value) { |
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$this->textData[$index] = (float) $value; |
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++$index; |
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} |
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} |
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} |
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} else { |
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$this->isBinary = true; |
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$this->gridFile->fseek(0); |
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$rawHeader = $this->gridFile->fread($this->binaryHeaderLength); |
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$icode = unpack("{$this->integerFormatChar}ICODE", $rawHeader)['ICODE']; |
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if ($icode !== 777) { |
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$this->integerFormatChar = 'N'; |
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$this->doubleFormatChar = 'E'; |
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$this->floatFormatChar = 'G'; |
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$icode = unpack("{$this->integerFormatChar}ICODE", $rawHeader)['ICODE']; |
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} |
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assert($icode === 777); |
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$header = unpack("{$this->integerFormatChar}ICODE/{$this->doubleFormatChar}BMIN/{$this->doubleFormatChar}BMAX/{$this->doubleFormatChar}LMIN/{$this->doubleFormatChar}LMAX/{$this->doubleFormatChar}DB/{$this->doubleFormatChar}DL/{$this->integerFormatChar}DATUM/{$this->integerFormatChar}CSTM/{$this->integerFormatChar}MODE", $rawHeader); |
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$this->startX = $header['LMIN']; |
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$this->startY = $header['BMIN']; |
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$this->endX = $header['LMAX']; |
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$this->endY = $header['BMAX']; |
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$this->columnGridInterval = $header['DL']; |
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$this->rowGridInterval = $header['DB']; |
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$this->numberOfColumns = (int) (string) (($this->endX - $this->startX) / $this->columnGridInterval) + 1; |
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$this->numberOfRows = (int) (string) (($this->endY - $this->startY) / $this->rowGridInterval) + 1; |
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// there's a weird 16 records per block thing here, columns extend beyond declared boundaries |
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$this->numberOfColumns = intdiv($this->numberOfColumns + 16 - 1, 16) * 16; |
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} |
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if ($this->startX > 180) { // normalise if necessary |
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$this->startX -= 360; |
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} |
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} |
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/** |
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* @return Metre[] |
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*/ |
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public function getValues($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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private function getRecord(int $longitudeIndex, int $latitudeIndex): GridValues |
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{ |
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$recordId = ($this->numberOfRows - $latitudeIndex - 1) * $this->numberOfColumns + $longitudeIndex; |
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$longitude = $longitudeIndex * $this->columnGridInterval + $this->startX; |
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$latitude = $latitudeIndex * $this->rowGridInterval + $this->startY; |
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if ($this->isBinary) { |
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$offset = $this->binaryHeaderLength + $recordId * 4; |
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$this->gridFile->fseek($offset); |
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$rawRow = $this->gridFile->fread(4); |
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$data = unpack("{$this->floatFormatChar}shift", $rawRow); |
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return new GridValues( |
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$longitude, |
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$latitude, |
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[$data['shift']] |
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); |
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} else { |
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return new GridValues( |
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$longitude, |
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$latitude, |
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[$this->textData[$recordId]] |
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); |
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} |
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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.