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55 lines
1.8 KiB
PHP
55 lines
1.8 KiB
PHP
<?php
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/**
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* Orange Management
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*
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* PHP Version 7.0
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*
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* @category TBD
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* @package TBD
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* @author OMS Development Team <dev@oms.com>
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* @author Dennis Eichhorn <d.eichhorn@oms.com>
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* @copyright 2013 Dennis Eichhorn
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* @license OMS License 1.0
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* @version 1.0.0
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* @link http://orange-management.com
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*/
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namespace phpOMS\Math\Algebra;
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class Sphere
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{
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/**
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* Calculating the distance between two points on a sphere
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*
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* @param float $latStart Latitude of start point in deg
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* @param float $longStart Longitude of start point in deg
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* @param float $latEnd Latitude of target point in deg
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* @param float $longEnd Longitude of target point in deg
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* @param float $radius Sphere radius
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*
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* @return float Distance between points in meter
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*
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* @since 1.0.0
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* @author Dennis Eichhorn <d.eichhorn@oms.com>
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*/
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public static function distance2PointsOnSphere(\float $latStart, \float $longStart, \float $latEnd, \float $longEnd, \float $radius = 6371000.0) : \float
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{
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$latFrom = deg2rad($latStart);
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$lonFrom = deg2rad($longStart);
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$latTo = deg2rad($latEnd);
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$lonTo = deg2rad($longEnd);
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$latDelta = $latTo - $latFrom;
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$lonDelta = $lonTo - $lonFrom;
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$a = pow(cos($latTo) * sin($lonDelta), 2) + pow(cos($latFrom) * sin($latTo) - sin($latFrom) * cos($latTo) * cos($lonDelta), 2);
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$b = sin($latFrom) * sin($latTo) + cos($latFrom) * cos($latTo) * cos($lonDelta);
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$angle = atan2(sqrt($a), $b);
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// Approximation (very good for short distances)
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// $angle = 2 * asin(sqrt(pow(sin($latDelta / 2), 2) + cos($latFrom) * cos($latTo) * pow(sin($lonDelta / 2), 2)));
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return $angle * $radius;
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}
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}
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