https://wuyongzheng.wordpress.com/2010/01/22/china-map-deviation-as-a-regression-problem/ https://wuyongzheng.wordpress.com/2010/01/22/china-map-devia... There

https://wuyongzheng.wordpress.com/2010/01/22/china-map-deviation-as-a-regression-problem/ 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).