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AS3 Getting the Distance Between Two Geographical Points

/ Published in: ActionScript 3
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Full credit for this goes to Terrence Ryan who converted the JavaScript version to ActionScript.

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  1. private const RADIUS_OF_EARTH_IN_MILES:int = 3963;
  2. private const RADIUS_OF_EARTH_IN_FEET:int =20925525;
  3. private const RADIUS_OF_EARTH_IN_KM:int =6378;
  4. private const RADIUS_OF_EARTH_IN_M:int =6378000;
  5.  
  6. private function distanceBetweenCoordinates(lat1:Number,lon1:Number,
  7.                                             lat2:Number,lon2:Number,
  8.                                             units:String="miles"):Number{
  9.  
  10. 	var R:int = RADIUS_OF_EARTH_IN_MILES;
  11. 	if (units == "km"){
  12. 		R = RADIUS_OF_EARTH_IN_KM;
  13. 	}
  14. 	if (units == "meters"){
  15. 		R = RADIUS_OF_EARTH_IN_M;
  16. 	}
  17. 	if (units =="feet"){
  18. 		R= RADIUS_OF_EARTH_IN_FEET;
  19. 	}
  20.  
  21. 	var dLat:Number = (lat2-lat1) * Math.PI/180;
  22. 	var dLon:Number = (lon2-lon1) * Math.PI/180;
  23.  
  24. 	var lat1inRadians:Number = lat1 * Math.PI/180;
  25. 	var lat2inRadians:Number = lat2 * Math.PI/180;
  26.  
  27. 	var a:Number = Math.sin(dLat/2) * Math.sin(dLat/2) + 
  28.                        Math.sin(dLon/2) * Math.sin(dLon/2) * 
  29.                        Math.cos(lat1inRadians) * Math.cos(lat2inRadians);
  30.         var c:Number = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  31.         var d:Number = R * c;
  32.  
  33. 	return d;
  34. }

URL: http://www.terrenceryan.com/blog/post.cfm/getting-the-distance-between-two-points-using-actionscript

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