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public static double geo_distance(double lat1, double lng1, double lat2,

double lng2) {

// earth's mean radius in KM

double r = 6378.137;

lat1 = Math.toRadians(lat1);

lng1 = Math.toRadians(lng1);

lat2 = Math.toRadians(lat2);

lng2 = Math.toRadians(lng2);

double d1 = Math.abs(lat1 - lat2);

double d2 = Math.abs(lng1 - lng2);

double p = Math.pow(Math.sin(d1 / 2), 2) + Math.cos(lat1)

* Math.cos(lat2) * Math.pow(Math.sin(d2 / 2), 2);

double dis = r * 2 * Math.asin(Math.sqrt(p));

return dis;

}

public static double geo_distance(double lat1, double lng1, double lat2,

double lng2) {

// earth's mean radius in KM

double r = 6378.137;

lat1 = Math.toRadians(lat1);

lng1 = Math.toRadians(lng1);

lat2 = Math.toRadians(lat2);

lng2 = Math.toRadians(lng2);

double d1 = Math.abs(lat1 - lat2);

double d2 = Math.abs(lng1 - lng2);

double p = Math.pow(Math.sin(d1 / 2), 2) + Math.cos(lat1)

* Math.cos(lat2) * Math.pow(Math.sin(d2 / 2), 2);

double dis = r * 2 * Math.asin(Math.sqrt(p));

return dis;

}