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Revision: 50830
at September 5, 2011 05:31 by adrianparr
Initial Code 
private const RADIUS_OF_EARTH_IN_MILES:int = 3963;
private const RADIUS_OF_EARTH_IN_FEET:int =20925525;
private const RADIUS_OF_EARTH_IN_KM:int =6378;
private const RADIUS_OF_EARTH_IN_M:int =6378000;

private function distanceBetweenCoordinates(lat1:Number,lon1:Number,
                                            lat2:Number,lon2:Number,
                                            units:String="miles"):Number{

	var R:int = RADIUS_OF_EARTH_IN_MILES;
	if (units == "km"){
		R = RADIUS_OF_EARTH_IN_KM;
	}
	if (units == "meters"){
		R = RADIUS_OF_EARTH_IN_M;
	}
	if (units =="feet"){
		R= RADIUS_OF_EARTH_IN_FEET;
	}

	var dLat:Number = (lat2-lat1) * Math.PI/180;
	var dLon:Number = (lon2-lon1) * Math.PI/180;

	var lat1inRadians:Number = lat1 * Math.PI/180;
	var lat2inRadians:Number = lat2 * Math.PI/180;

	var a:Number = Math.sin(dLat/2) * Math.sin(dLat/2) + 
                       Math.sin(dLon/2) * Math.sin(dLon/2) * 
                       Math.cos(lat1inRadians) * Math.cos(lat2inRadians);
        var c:Number = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
        var d:Number = R * c;

	return d;
}
Initial URL 
http://www.terrenceryan.com/blog/post.cfm/getting-the-distance-between-two-points-using-actionscript
Initial Description 
Full credit for this goes to Terrence Ryan who converted the JavaScript version to ActionScript.
Initial Title 
AS3 Getting the Distance Between Two Geographical Points
Initial Tags 

                                

                                                            

                                    

                                        

                                        Initial Language
                                        

                                    

                                    
ActionScript 3