2017年06月30日星期五
- 今天测试美眉跑过来和我说地图模块中的定位是有问题的，有偏移量，而且偏移量比较随机。我狡辩说没问题，是手机定位不准确.... 认真看了代码之后，感觉是不是定位之后获取坐标的时候小数点没有获取够啊...
- 未果...
- 咨询了一下做地图的大牛，发现是因为百度地图自己的定位因为隐私还是其他原因，和其他地图的定位坐标有偏移量，SDK中还是提供了坐标转换的功能。如下，
// 设备的当前位置
CLLocation *currLocation = [locations lastObject];
CLLocationCoordinate2D test = CLLocationCoordinate2DMake(currLocation.coordinate.latitude, currLocation.coordinate.longitude);
//获取百度地图base64加密的自己的坐标
NSDictionary *testdic = BMKConvertBaiduCoorFrom(test,BMK_COORDTYPE_GPS);
//解base64的加密
CLLocationCoordinate2D realBadiDuPoint = BMKCoorDictionaryDecode(testdic);
另，附百度地图坐标系和IOS原生地图(高德)的坐标系的转换
百度地图坐标与苹果自带地图经纬度之间的相互转换方法：
/// 百度坐标转高德坐标
+ (CLLocationCoordinate2D)GCJ02FromBD09:(CLLocationCoordinate2D)coor
{
CLLocationDegrees x_pi = 3.14159265358979324 * 3000.0 / 180.0;
CLLocationDegrees x = coor.longitude - 0.0065, y = coor.latitude - 0.006;
CLLocationDegrees z = sqrt(x * x + y * y) - 0.00002 * sin(y * x_pi);
CLLocationDegrees theta = atan2(y, x) - 0.000003 * cos(x * x_pi);
CLLocationDegrees gg_lon = z * cos(theta);
CLLocationDegrees gg_lat = z * sin(theta);
return CLLocationCoordinate2DMake(gg_lat, gg_lon);
}
// 高德坐标转百度坐标
+ (CLLocationCoordinate2D)BD09FromGCJ02:(CLLocationCoordinate2D)coor
{
CLLocationDegrees x_pi = 3.14159265358979324 * 3000.0 / 180.0;
CLLocationDegrees x = coor.longitude, y = coor.latitude;
CLLocationDegrees z = sqrt(x * x + y * y) + 0.00002 * sin(y * x_pi);
CLLocationDegrees theta = atan2(y, x) + 0.000003 * cos(x * x_pi);
CLLocationDegrees bd_lon = z * cos(theta) + 0.0065;
CLLocationDegrees bd_lat = z * sin(theta) + 0.006;
return CLLocationCoordinate2DMake(bd_lat, bd_lon);
}
