RE: [PHP] longitude/latitude function

Thanks Aaron, If you don't mind me asking, where did you get it? It seems to give a better answer than my function. Thanks! Eddie -----Original Message----- From: Aaron Gould [mailto:webdevel@partscanada.com] Sent: Friday, November 15, 2002 11:04 AM To: Edward Peloke; php-general@lists.php.net Subject: Re: [PHP] longitude/latitude function Try this snippet... I can't vouch for its accuracy since I am not a mathematician: <? // Function takes latitude and longitude of two places as input // and prints the distance in miles and kms. function calculateDistance($lat1, $lon1, $lat2, $lon2) // Convert all the degrees to radians $lat1 = deg2rad($lat1); $lon1 = deg2rad($lon1); $lat2 = deg2rad($lat2); $lon2 = deg2rad($lon2); // Find the deltas $delta_lat = $lat2 - $lat1; $delta_lon = $lon2 - $lon1; // Find the Great Circle distance $temp = pow(sin($delta_lat / 2.0), 2) + cos($lat1) * cos($lat2) * pow(sin($delta_lon / 2.0), 2); $EARTH_RADIUS = 3956; $distance = ($EARTH_RADIUS * 2 * atan2(sqrt($temp), sqrt(1 - $temp)) * 1.6093); return $distance; } ?> -- Aaron Gould agould@partscanada.com Web Developer Parts Canada ----- Original Message ----- From: "Edward Peloke" <epeloke@echoman.com> To: <php-general@lists.php.net> Sent: Friday, November 15, 2002 11:20 AM Subject: [PHP] longitude/latitude function > Has anyone ever written a php function to take the longitude and latitude of > two destinations and calculate the distance? > > I am working on one but the output is just a little off. > > Thanks, > Eddie > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php