# Solve the problem of coordinate transformation of Python GDAL projection

Time：2020-9-16

To convert the xian80 geographic coordinate system to a projected coordinate system:

``````
xian1980 = """
GEOGCS["GCS_Xian_1980",
DATUM["Xian_1980",
SPHEROID["Xian_1980",6378140.0,298.257]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]]"""
prjreference = 'PROJCS["Xian_1980_3_Degree_GK_Zone_37",GEOGCS["GCS_Xian_1980",DATUM["D_Xian_1980",SPHEROID["Xian_1980",6378140.0,298.257]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Gauss_Kruger"],PARAMETER["False_Easting",37500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",111.0],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]'``````

Error will be reported after conversion:

``````latlong = transform.TransformPoint(x,y)
File "/usr/lib/python3/dist-packages/osgeo/osr.py", line 711, in TransformPoint
return _osr.CoordinateTransformation_TransformPoint(self, *args)
NotImplementedError: Wrong number or type of arguments for overloaded function 'CoordinateTransformation_TransformPoint'.
Possible C/C++ prototypes are: