gpx_distance

geocode/includes/modules/filefield/gpx.inc, line 115

Versions

6

gpx_distance($lat1, $lon1, $lat2, $lon2)

Code

<?php
function gpx_distance($lat1, $lon1, $lat2, $lon2) {
  $r = 3958.75; // Earth's radius, in miles
  $d_lat = deg2rad($lat2 - $lat1);
  $d_lon = deg2rad($lon2 - $lon1);

  $a = sin($d_lat/2) * sin($d_lat/2) +
       cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *
       sin($d_lon/2) * sin($d_lon/2);
  $c = 2 * atan2(sqrt($a), sqrt(1-$a));
  return $r * $c;
}
?>