百度地图坐标系和火星坐标系之间的互相转换

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// 百度转火星

-(CLLocationCoordinate2D)hhTrans_GCGPS:(CLLocationCoordinate2D)baiduGps

{

    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 * M_PI);

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

    googleGps.longitude = z * cos(theta);

    googleGps.latitude = z * sin(theta);

    return googleGps;

}

其他坐标转百度坐标系

 CLLocationCoordinate2D test = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude);

        //转换 google地图、soso地图、aliyun地图、mapabc地图和amap地图所用坐标至百度坐标

        NSDictionary* testdic = BMKConvertBaiduCoorFrom(test,BMK_COORDTYPE_COMMON);

        //转换GPS坐标至百度坐标

        testdic = BMKConvertBaiduCoorFrom(test,BMK_COORDTYPE_GPS);

        NSLog(@"x=%f,y=%f",location.coordinate.latitude,location.coordinate.longitude);

        NSLog(@"x=%@,y=%@",[testdic objectForKey:@"x"],[testdic objectForKey:@"y"]);

        NSString *lat = [MCEncryption base64FromBase64String:[testdic objectForKey:@"x"]] ;

        NSString *lon = [MCEncryption base64FromBase64String:[testdic objectForKey:@"y"]] ;

百度地图坐标系和火星坐标系之间的互相转换

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原文地址：http://www.cnblogs.com/mglttkx/p/5522856.html