// 由经纬度计算两点距离

private final double EARTH_RADIUS = 6378137.0;  

private double gps2m(double lat_a, double lng_a, double lat_b, double lng_b) {

       double radLat1 = (lat_a * Math.PI / 180.0);

       double radLat2 = (lat_b * Math.PI / 180.0);

       double a = radLat1 - radLat2;

       double b = (lng_a - lng_b) * Math.PI / 180.0;

       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;

    }

转载于:https://www.cnblogs.com/heimi/archive/2013/01/15/2860918.html