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<?php /*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/ /*:: :*/ /*:: This routine calculates the distance between two points (given the :*/ /*:: latitude/longitude of those points). It is being used to calculate :*/ /*:: the distance between two locations using GeoDataSource(TM) Products :*/ /*:: :*/ /*:: Definitions: :*/ /*:: South latitudes are negative, east longitudes are positive :*/ /*:: :*/ /*:: Passed to function: :*/ /*:: lat1, lon1 = Latitude and Longitude of point 1 (in decimal degrees) :*/ /*:: lat2, lon2 = Latitude and Longitude of point 2 (in decimal degrees) :*/ /*:: unit = the unit you desire for results :*/ /*:: where: 'M' is statute miles :*/ /*:: 'K' is kilometers (default) :*/ /*:: 'N' is nautical miles :*/ /*:: Worldwide cities and other features databases with latitude longitude :*/ /*:: are available at http://www.geodatasource.com :*/ /*:: :*/ /*:: For enquiries, please contact sales@geodatasource.com :*/ /*:: :*/ /*:: Official Web site: http://www.geodatasource.com :*/ /*:: :*/ /*:: GeoDataSource.com (C) All Rights Reserved 2014 :*/ /*:: :*/ /*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/ function distance($lat1, $lon1, $lat2, $lon2, $unit) { $theta = $lon1 - $lon2; $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta)); $dist = acos($dist); $dist = rad2deg($dist); $miles = $dist * 60 * 1.1515; $unit = strtoupper($unit); if ($unit == "K") { return ($miles * 1.609344); } else if ($unit == "N") { return ($miles * 0.8684); } else { return $miles; } } echo distance(32.9697, -96.80322, 29.46786, -98.53506, "M") . " Miles<br>"; echo distance(32.9697, -96.80322, 29.46786, -98.53506, "K") . " Kilometers<br>"; echo distance(32.9697, -96.80322, 29.46786, -98.53506, "N") . " Nautical Miles<br>"; ?>

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