iOS开发 百度坐标转火星坐标

- (CLLocationCoordinate2D)hhTrans_GCGPS:(CLLocationCoordinate2D)baiduGps

{

const double x_pi = 3.14159265358979324 * 3000.0 / 180.0;

CLLocationCoordinate2D googleGps;

double bd_x=baiduGps.longitude - 0.0065;

double bd_y=baiduGps.latitude - 0.006;

double z = sqrt(bd_x * bd_x + bd_y * bd_y) - 0.00002 * sin(bd_y * x_pi);

double theta = atan2(bd_y, bd_x) - 0.000003 * cos(bd_x * x_pi);

googleGps.longitude = z * cos(theta);

googleGps.latitude = z * sin(theta);

return googleGps;

}