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Chinese goverment uses a different coordinate system called "GCJ-02 (Guo Ce Ju 2002)".
This means, if you want provide map service in China, you must convert WGS-84 points to GCJ-02 points.
Google Ditu(maps.google.cn or ditu.google.cn) uses GCJ-02 coordinate system.
So if you add a marker with a WGS-84 position, The marker position will be completely wrong, like above screenshot.
There is an english article about GCJ-02: http://www.sinosplice.com/life/archi...offset-problem
And some convert code: https://github.com/googollee/eviltransform
Chinese goverment uses a different coordinate system called "GCJ-02 (Guo Ce Ju 2002)".
This means, if you want provide map service in China, you must convert WGS-84 points to GCJ-02 points.
Google Ditu(maps.google.cn or ditu.google.cn) uses GCJ-02 coordinate system.
So if you add a marker with a WGS-84 position, The marker position will be completely wrong, like above screenshot.
There is an english article about GCJ-02: http://www.sinosplice.com/life/archi...offset-problem
And some convert code: https://github.com/googollee/eviltransform