iOS 地圖 通過經緯度計算兩點間距離

標籤：

- (double)calculateStart:(CLLocationCoordinate2D)start end:(CLLocationCoordinate2D)end {        double meter = 0;        double startLongitude = start.longitude;    double startLatitude = start.latitude;    double endLongitude = end.longitude;    double endLatitude = end.latitude;        double radLatitude1 = startLatitude * M_PI / 180.0;    double radLatitude2 = endLatitude * M_PI / 180.0;    double a = fabs(radLatitude1 - radLatitude2);    double b = fabs(startLongitude * M_PI / 180.0 - endLongitude * M_PI / 180.0);        double s = 2 * asin(sqrt(pow(sin(a/2),2) + cos(radLatitude1) * cos(radLatitude2) * pow(sin(b/2),2)));    s = s * EARTH_RADIUS;        meter = round(s * 10000) / 10000; //返回距離單位是米    return meter;}

//赤道半徑 EARTH_RADIUS = 6378137; //start 起點經緯度,資料格式 start = {lon:,lat:} //end 終點定位度,資料格式 end = {lon:,lat:}

iOS 地圖 通過經緯度計算兩點間距離