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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 assert; |
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use function in_array; |
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use PHPCoord\UnitOfMeasure\Angle\ArcSecond; |
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use PHPCoord\UnitOfMeasure\Length\Metre; |
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use SplFileObject; |
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use function unpack; |
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class BYNHeightGrid extends GeographicGeoidHeightGrid |
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{ |
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use BiquadraticInterpolation; |
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private string $shortFormatChar = 'v'; |
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private string $longFormatChar = 'V'; |
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private string $doubleFormatChar = 'e'; |
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private string $floatFormatChar = 'g'; |
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private int $dataSize; |
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private float $conversionFactor; |
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public function __construct($filename) |
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{ |
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$this->storageOrder = self::STORAGE_ORDER_INCREASING_LONGITUDE_DECREASING_LATIITUDE; |
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$this->gridFile = new SplFileObject($filename); |
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$this->gridFile->fseek(0); |
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$rawData = $this->gridFile->fread(80); |
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if (unpack('vByteOrder', $rawData, 50)['ByteOrder'] === 1) { |
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$this->shortFormatChar = 'n'; |
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$this->longFormatChar = 'N'; |
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$this->doubleFormatChar = 'E'; |
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$this->floatFormatChar = 'G'; |
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} |
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$data = unpack("{$this->longFormatChar}SOUTH/{$this->longFormatChar}NORTH/{$this->longFormatChar}WEST/{$this->longFormatChar}EAST/{$this->shortFormatChar}DLAT/{$this->shortFormatChar}DLON/{$this->shortFormatChar}GLOBAL/{$this->shortFormatChar}TYPE/{$this->doubleFormatChar}FACTOR/{$this->shortFormatChar}SIZEOF/x4/{$this->shortFormatChar}DATA/{$this->shortFormatChar}SUBTYPE/{$this->shortFormatChar}DATUM/{$this->shortFormatChar}ELLIPSOID/{$this->shortFormatChar}BYTEORDER/{$this->shortFormatChar}SCALE/{$this->doubleFormatChar}WO/{$this->doubleFormatChar}GM/{$this->shortFormatChar}TIDESYSTEM/{$this->shortFormatChar}REFREALISATION/{$this->floatFormatChar}EPOCH/{$this->shortFormatChar}PTTYPE/x2", $rawData); |
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foreach ($data as $key => $value) { |
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if (in_array($key, ['SOUTH', 'EAST', 'NORTH', 'WEST']) && $value > 2147483647) { |
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$data[$key] -= 4294967295; |
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} |
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} |
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assert($data['DATA'] === 0); // actual values, not errors |
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assert($data['TYPE'] === 1); // ellipsoid separation |
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assert($data['SIZEOF'] === 2 || $data['SIZEOF'] === 4); // sensible data type |
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$this->startX = (new ArcSecond($data['WEST']))->asDegrees()->getValue(); |
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$this->startY = (new ArcSecond($data['SOUTH']))->asDegrees()->getValue(); |
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$this->endX = (new ArcSecond($data['EAST']))->asDegrees()->getValue(); |
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$this->endY = (new ArcSecond($data['NORTH']))->asDegrees()->getValue(); |
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$this->columnGridInterval = (new ArcSecond($data['DLON']))->asDegrees()->getValue(); |
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$this->rowGridInterval = (new ArcSecond($data['DLAT']))->asDegrees()->getValue(); |
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$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->dataSize = $data['SIZEOF']; |
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$this->conversionFactor = $data['FACTOR']; |
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} |
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/** |
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* @return Metre[] |
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*/ |
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public function getValues($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 = ($this->numberOfRows - $latitudeIndex - 1) * $this->numberOfColumns + $longitudeIndex; |
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$offset = 80 + $recordId * $this->dataSize; |
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$this->gridFile->fseek($offset); |
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$rawRow = $this->gridFile->fread($this->dataSize); |
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$dataType = $this->dataSize === 2 ? $this->shortFormatChar : $this->longFormatChar; |
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$shift = unpack("{$dataType}shift", $rawRow)['shift']; |
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if ($this->dataSize === 4 && $shift > 2147483647) { |
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$shift -= 4294967295; |
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} elseif ($this->dataSize === 2 && $shift > 32767) { |
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$shift -= 65535; |
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} |
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$shift = $shift / $this->conversionFactor; |
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return new GridValues( |
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$longitudeIndex * $this->columnGridInterval + $this->startX, |
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$latitudeIndex * $this->rowGridInterval + $this->startY, |
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[$shift] |
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); |
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} |
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} |
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dvdoug /
PHPCoord
