经纬度计算距离

public class Gps2m {    private static final double EARTH_RADIUS = 6378137.0;    //利用两次经纬度计算距离（返回单位是米）    public static double getDistance(double longitude1, double latitude1, double longitude2, double latitude2) {        double Lat1 = rad(latitude1);        double Lat2 = rad(latitude2);        double a = Lat1 - Lat2;        double b = rad(longitude1) - rad(longitude2);        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)                + Math.cos(Lat1) * Math.cos(Lat2)                * Math.pow(Math.sin(b / 2), 2)));        s = s * EARTH_RADIUS;        s = Math.round(s * 10000) / 10000;        return s;    }    private static double rad(double d) {        return d * Math.PI / 180.0;    }}