3 ms·
> It uses an encryption algorithm[13] which adds apparently random offsets to both the latitude and longitude, with the alleged goal of improving national secur
by csours 11y ago
> 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
- poizan42 11y ago> reversible randomness Yeah, we have a word for that: encryption
- kristofferR 11y agohttps://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).