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Calculating the distance between two points using latitude and longitude

How to handle distance bettween latitude/longitude points. Haversine Formula http://en.wikipedia.org/wiki/Haversine_formula Php Function to calculate distance between 2 points:

function distance($lat1, $lon1, $lat2, $lon2) { 
$pi80 = M_PI / 180; 
$lat1 *= $pi80; 
$lon1 *= $pi80; 
$lat2 *= $pi80; 
$lon2 *= $pi80; 
$r = 6372.797; // mean radius of Earth in km 
$dlat = $lat2 - $lat1; 
$dlon = $lon2 - $lon1; 
$a = sin($dlat / 2) * sin($dlat / 2) + cos($lat1) * cos($lat2) * sin($dlon / 2) * sin($dlon / 2); 
$c = 2 * atan2(sqrt($a), sqrt(1 - $a)); 
$km = $r * $c; 
//echo ' '.$km; 
return $km; 
}
 

Mysql Query getting the nearest points (objects,products,users, what ever ….) This SlideShare could help you optimize your querys, since make querys and manipulating coords are time consuming with big db’s.

Geo Distance Search with MySQL by Oleksiy Kovyrin

Doing some testing before coding anything http://www.movable-type.co.uk/scripts/latlong.html    

Beto López
Software engineer & Full stack website developer who has left a startup job where wednesdays were "yoga days", to build an standarized-low-cost technical support service, deepest than than the service hosting companies provide, for website owners, freelancers and digital businesses. Personal Website, Linkedin y Twitter.


Calculating the distance between two points using latitude and longitude
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