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<?php |
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/** |
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* PHPCoord |
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* @package PHPCoord |
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* @author Jonathan Stott |
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* @author Doug Wright |
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*/ |
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namespace PHPCoord; |
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/** |
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* Ordnance Survey grid reference |
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* References are accurate to 1m |
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* @author Jonathan Stott |
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* @author Doug Wright |
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* @package PHPCoord |
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*/ |
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class OSRef extends TransverseMercator |
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{ |
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const GRID_LETTERS = "VWXYZQRSTULMNOPFGHJKABCDE"; |
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public function getReferenceEllipsoid() |
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{ |
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return RefEll::airy1830(); |
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} |
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public function getScaleFactor() |
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{ |
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return 0.9996012717; |
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} |
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public function getOriginNorthing() |
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{ |
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return -100000; |
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} |
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public function getOriginEasting() |
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{ |
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return 400000; |
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} |
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public function getOriginLatitude() |
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{ |
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return 49; |
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} |
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public function getOriginLongitude() |
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{ |
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return -2; |
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} |
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/** |
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* Create a new object representing a UTM reference. |
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* |
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* @param int $x |
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* @param int $y |
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*/ |
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public function __construct($x, $y) |
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{ |
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parent::__construct($x, $y, 0, RefEll::airy1830()); |
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} |
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/** |
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* Take a string formatted as a six-figure OS grid reference (e.g. |
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* "TG514131") and return a reference to an OSRef object that represents |
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* that grid reference. |
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* |
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* @param string $ref |
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* @return OSRef |
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*/ |
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public static function getOSRefFromSixFigureReference($ref) |
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{ |
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//first (major) letter is the 500km grid sq, origin at -1000000, -500000 |
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$majorEasting = strpos(self::GRID_LETTERS, $ref[0]) % 5 * 500000 - 1000000; |
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$majorNorthing = (floor(strpos(self::GRID_LETTERS, $ref[0]) / 5)) * 500000 - 500000; |
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//second (minor) letter is 100km grid sq, origin at 0,0 of this square |
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$minorEasting = strpos(self::GRID_LETTERS, $ref[1]) % 5 * 100000; |
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$minorNorthing = (floor(strpos(self::GRID_LETTERS, $ref[1]) / 5)) * 100000; |
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$easting = $majorEasting + $minorEasting + (substr($ref, 2, 3) * 100); |
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$northing = $majorNorthing + $minorNorthing + (substr($ref, 5, 3) * 100); |
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return new OSRef($easting, $northing); |
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} |
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/** |
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* Convert this grid reference into a string using a standard six-figure |
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* grid reference including the two-character designation for the 100km |
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* square. e.g. TG514131. |
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* @return string |
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*/ |
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public function toSixFigureString() |
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{ |
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$easting = str_pad($this->x, 6, 0, STR_PAD_LEFT); |
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$northing = str_pad($this->y, 6, 0, STR_PAD_LEFT); |
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$adjustedX = $this->x + 1000000; |
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$adjustedY = $this->y + 500000; |
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$majorSquaresEast = floor($adjustedX / 500000); |
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$majorSquaresNorth = floor($adjustedY / 500000); |
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$majorLetterIndex = (int)(5 * $majorSquaresNorth + $majorSquaresEast); |
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$majorLetter = self::GRID_LETTERS[$majorLetterIndex]; |
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//second (minor) letter is 100km grid sq, origin at 0,0 of this square |
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$minorSquaresEast = $easting[0] % 5; |
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$minorSquaresNorth = $northing[0] % 5; |
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$minorLetterIndex = (int)(5 * $minorSquaresNorth + $minorSquaresEast); |
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$minorLetter = self::GRID_LETTERS[$minorLetterIndex]; |
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return $majorLetter . $minorLetter . substr($easting, 1, 3) . substr($northing, 1, 3); |
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} |
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/** |
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* Convert this grid reference into a latitude and longitude |
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* @return LatLng |
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*/ |
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public function toLatLng() |
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{ |
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$N = $this->y; |
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$E = $this->x; |
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$N0 = $this->getOriginNorthing(); |
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$E0 = $this->getOriginEasting(); |
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$phi0 = $this->getOriginLatitude(); |
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$lambda0 = $this->getOriginLongitude(); |
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return $this->convertToLatitudeLongitude($N, $E, $N0, $E0, $phi0, $lambda0); |
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} |
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/** |
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* String version of coordinate. |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return "({$this->x}, {$this->y})"; |
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} |
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} |
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dvdoug /
PHPCoord
