计算GPS点之间的距离

latitude纬度  longtitude经度
// 求弧度
double getRadian(double d)
{
    return d * PI / 180.0;   //角度1? = π / 180
}

//计算距离  米
double getDistance(double lat1, double lng1, double lat2, double lng2)
{
    double radLat1 = getRadian(lat1);
    double radLat2 = getRadian(lat2);
    double a = radLat1 - radLat2;
    double b = getRadian(lng1) - getRadian(lng2);

    double dst =  * asin((sqrt(pow(sin(a / ), ) + cos(radLat1) * cos(radLat2) * pow(sin(b / ), ) )));
    dst = dst * EARTH_RADIUS * ;

    return dst;
}