Algorithms

Lat_Long_2_Miles

Type:	code fragment
Added by:	farrukh
Entered:	04/12/2000
Last modified:	01/12/2000
Rating:	- (fewer than 3 votes)
Views:	6592

Computes the shortest distance between 2 points (locations) on the earth surface given the Latitude/Longitude.

<?php

                            
 function calcMiles($lat1, $lon1, $lat2, $lon2) { 

                            
 $deg2mile = 69.09;  //for earth
 $temp1 = cos(deg2rad($lat1));
 $temp2 = cos(deg2rad($lat2));

                            
 $dist = sqrt( $temp1 * $temp2 * pow($lon1 - $lon2 , 2) + pow($lat1 - $lat2, 2) );
 $miles = $dist * $deg2mile; 
 $miles = sprintf("%0.2f",$miles); 

                            return $miles; 

                            }
 ?>

Usage Example

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