根据两点的经纬度计算两点真实距离
- (double)calculateStart:(CLLocationCoordinate2D)start end:(CLLocationCoordinate2D)end {
doubleEARTH_RADIUS =6378137;
doublemeter =0;
doublestartLongitude = start.longitude;
doublestartLatitude = start.latitude;
doubleendLongitude = end.longitude;
doubleendLatitude = end.latitude;
doubleradLatitude1 = startLatitude *M_PI/180.0;
doubleradLatitude2 = endLatitude *M_PI/180.0;
doublea =fabs(radLatitude1 - radLatitude2);
doubleb =fabs(startLongitude *M_PI/180.0- endLongitude *M_PI/180.0);
doubles =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;//返回距离单位是米
returnmeter;
}
