• Feedburner RSS
  • Comments RSS
  • Post RSS

Actionscript Distance Between 2 Longitude Latitude Points

September 6th, 2009

Recently I’ve been doing alot of Google Maps stuff in flash, and have needed this more than once. This will give you the distance in miles or km between 2 Longitude and Latitude Points.

function getLatLngDistance($lat1:Number, $lng1:Number, $lat2:Number, $lng2:Number, $miles:Boolean=true):Number{
		var pi80:Number = Math.PI/180;
		$lat1 *= pi80;
	      	$lng1 *= pi80;
	      	$lat2 *= pi80;
	      	$lng2 *= pi80;
 
	      	var earthRadius:Number = 6372.797; // mean radius of Earth in km
	      	var dlat:Number = $lat2-$lat1;
	      	var dlng:Number = $lng2-$lng1;
	      	var a:Number = Math.sin(dlat / 2) * Math.sin(dlat / 2) + Math.cos($lat1) * Math.cos($lat2) * Math.sin(dlng / 2) * Math.sin(dlng / 2);
	      	var c:Number = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
	      	var km:Number = earthRadius*c;
     	 	return ($miles ? (km * 0.621371192) : km);
}