private static 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; }
