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> It uses an encryption algorithm[13] which adds apparently random offsets to both the latitude and longitude, with the alleged goal of improving national security.

You're both right! It uses reversible randomness apparently. Wonder how hard the algorithm and seed(s) are to figure out



> reversible randomness

Yeah, we have a word for that: encryption


https://wuyongzheng.wordpress.com/2010/01/22/china-map-devia...

There are now many OSS-tools that convert between the global coordinate system standard (WGS-84) and the Chinese deliberately incompatible coordinate systems (GCJ-02 and BD-09).




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