Created
July 12, 2014 00:20
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distense of two point
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private const double EARTH_RADIUS = 6378.137; | |
private static double rad(double d) | |
{ | |
return d * Math.PI / 180.0; | |
} | |
public static double GetDistance(double lat1, double lng1, double lat2, double lng2) | |
{ | |
double radLat1 = rad(lat1); | |
double radLat2 = rad(lat2); | |
double a = radLat1 - radLat2; | |
double b = rad(lng1) - rad(lng2); | |
double s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a/2),2) + | |
Math.Cos(radLat1)*Math.Cos(radLat2)*Math.Pow(Math.Sin(b/2),2))); | |
s = s * EARTH_RADIUS; | |
s = Math.Round(s * 10000) / 10000; | |
return s; | |
} |
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