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<?php |
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/* |
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* This file is part of the Geotools library. |
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* |
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* (c) Antoine Corcy <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\Geotools\Geohash; |
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use League\Geotools\Coordinate\CoordinateInterface; |
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/** |
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* TenTen class |
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* |
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* @see http://blog.jgc.org/2006/07/simple-code-for-entering-latitude-and.html |
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* @see http://blog.jgc.org/2010/06/1010-code.html |
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* |
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* @author Antoine Corcy <[email protected]> |
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*/ |
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class TenTen |
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{ |
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/** |
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* The alphabet base. |
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* |
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* @var integer |
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*/ |
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const BASE = 29; |
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/** |
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* The used alphabet. |
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* |
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* @var string |
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*/ |
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private $alphabet = 'ABCDEFGHJKMNPQRVWXY0123456789'; |
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/** |
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* Encode the coordinate via the 10:10 algorithm. |
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* |
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* @param CoordinateInterface $coordinate The coordinate to encode. |
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* @return string |
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*/ |
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public function encode(CoordinateInterface $coordinate) |
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{ |
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$latitude = floor(($coordinate->getLatitude() + 90.0) * 10000.0); |
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$longitude = floor(($coordinate->getLongitude() + 180.0) * 10000.0); |
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$position = $latitude * 3600000.0 + $longitude; |
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$ttNumber = $position * self::BASE; |
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$checkDigit = 0; |
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for ($i = 1; $i < 10; ++$i) { |
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$checkDigit += ($position % self::BASE) * $i; |
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$position = floor($position / self::BASE); |
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} |
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$checkDigit %= self::BASE; |
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1 |
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$ttNumber += $checkDigit; |
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$ttNumber = floor($ttNumber); |
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$tt = ''; |
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for ($i = 0; $i < 10; ++$i) { |
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$digit = $ttNumber % self::BASE; |
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if ($i === 4 || $i === 7) { |
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$tt = ' ' . $tt; |
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} |
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$tt = $this->alphabet[$digit] . $tt; |
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$ttNumber = floor($ttNumber / self::BASE); |
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} |
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return $tt; |
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} |
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} |
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thephpleague /
geotools
