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copied!<p>Your formula looks different to my implementation. However mine's in .NET but I've unit tested it and it works well.</p> <p>It's a slightly rewritten version of this: <a href="http://megocode3.wordpress.com/2008/02/05/haversine-formula-in-c/" rel="nofollow">http://megocode3.wordpress.com/2008/02/05/haversine-formula-in-c/</a></p> <pre><code>/// <summary> /// Implementation of the Haversine formula /// For calculating the distance between 2 points on a sphere /// http://en.wikipedia.org/wiki/Haversine_formula /// </summary> public class Haversine { /// <summary> /// Calculate the distance between 2 points in miles or kilometers /// http://megocode3.wordpress.com/2008/02/05/haversine-formula-in-c/ /// /// This assumes sea level /// </summary> public double Distance(LatLon pos1, LatLon pos2, DistanceType type) { const double RADIUS_OF_EARTH_IN_MILES = 3963.1676; const double RADIUS_OF_EARTH_IN_KILOMETERS = 6378.1; //radius of the earth double R = (type == DistanceType.Miles) ? RADIUS_OF_EARTH_IN_MILES : RADIUS_OF_EARTH_IN_KILOMETERS; //Deltas double dLat = ToRadian(pos2.Lat - pos1.Lat); double dLon = ToRadian(pos2.Lon - pos1.Lon); double a = Math.Sin(dLat/2)*Math.Sin(dLat/2) + Math.Cos(ToRadian(pos1.Lat))*Math.Cos(ToRadian(pos2.Lat)) * Math.Sin(dLon / 2) * Math.Sin(dLon / 2); double c = 2 * Math.Asin(Math.Min(1, Math.Sqrt(a))); double d = R*c; return d; } /// <summary> /// Convert to Radians. /// </summary> private double ToRadian(double val) { return (Math.PI / 180) * val; } } </code></pre>

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