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https://en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China https://en.wikipedia.org/wiki/Restrictions_on_geographic_dat...

• logfromblammo 9y ago
  As I have occasionally worked with geodetic coordinate conversions in the past, that GCJ-02 datum sounds like an incredibly bad idea. The worst accidental mistake I have ever made with respect to geodetic coordinates, relating to accumulating floating-point round-off errors, absolutely pales in comparison to the sheer idiocy of introducing errors into your geodetic datum on purpose. Look, people, satellite photography exists now. That objective reality maps really well onto a coordinate systems based on a smooth ellipsoid. If you intentionally make your domestically-produced map products harder to use for people in your own country, they will buy better maps from other countries. If your goal is to make your 50 most important military assets harder to find, and in the process make it harder to find a billion civilian assets, you're going to lose more money just paying all those delivery drivers to get lost for 20 minutes than it would cost to rebuild those 50 military assets 10 times over.