1 private double rad(double d)
2 {
3 return d * Math.PI / 180.0;
4 }
5
6 public double getDistance(double lat1, double lng1, double lat2,
7 double lng2)
8 {
9 double radLat1 = rad(lat1);
10 double radLat2 = rad(lat2);
11 double a = radLat1 - radLat2;
12 double b = rad(lng1) - rad(lng2);
13 double s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2)
14 + Math.Cos(radLat1) * Math.Cos(radLat2)
15 * Math.Pow(Math.Sin(b / 2), 2)));
16 s = s * 6378.137;
17 s = Math.Round(s * 10000);
18 s = s / 10000;
19 return s ;//计算单位：公里
20 }
