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35 lines
1.0 KiB
35 lines
1.0 KiB
<?php
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class geocode
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{
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/**
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* straight_line_distance - Returns Straight Line distance between two sets of (LAT/LONGS)
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* @param real $lat1 - Latitude of Location #1
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* @param real $lon1 - Longitude of Location #1
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* @param real $lat2 - Latitude of Location #2
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* @param real $lon2 - Longitude of Location #2
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* @param string $unit - Unit of measure [DEFAULT = statute miles] ('K'=kilometers, 'N'=nautical miles)
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* @return numeric - returns the distance in the desired unit of measure.
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*/
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public function straight_line_distance($lat1, $lon1, $lat2, $lon2, $unit='')
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{
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$theta = $lon1 - $lon2;
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$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
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$dist = acos($dist);
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$dist = rad2deg($dist);
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$miles = $dist * 60 * 1.1515;
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$unit = strtoupper($unit);
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if ($unit == "K")
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{
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return ($miles * 1.609344);
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}
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else if ($unit == "N")
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{
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return ($miles * 0.8684);
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}
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else
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{
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return $miles;
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}
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}
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}
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