根据任意两点地图坐标算出距离是多少

 1  private static double rads(double d)
 2         {
 3             return d*Math.PI/180.0;
 4         }
 5 
 6         private const double EarihRadius = 6378.137;
 7 
 8         private static double GetDistances(double lat1, double lng1, double lat2, double lng2)
 9         {
10             var radLat1 = rads(lat1);
11             var radLat2 = rads(lat2);
12             var lat = radLat1 - radLat2;
13             var lng = rads(lng1) - rads(lng2);
14             var s = 2*
15                     Math.Asin(
16                         Math.Sqrt(Math.Pow(Math.Sin(lat/2), 2) +
17                                   Math.Cos(radLat1)*Math.Cos(radLat2)*Math.Pow(Math.Sin(lng/2), 2)));
18             s = s*EarihRadius;
19             return Math.Round(s*10000)/10000;
20         }
21 
22 
23 ///
24 var c = GetDistances( 39.90408611111111,116.29571388888888, 39.9061185, 116.297728);
25             Console.WriteLine(c);
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