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It's "impossible".

Private, independent geographical surveying is illegal in China. [0] So technically you can't do it even in the local coordinate system.

[0] https://en.wikipedia.org/wiki/Restrictions_on_geographic_dat...

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But I guess to OPs point, you could make a non-authoritative map based on satellite imagery, it just wouldn’t be legal to use in China.

OSM has an extensive article about mapping in China. Generally it's not allowed. Still, in the bigger OSM is quite accurate. :>

Anything that can be seen from a satellite is quite accurate, that's true, but oftentimes things like number of lanes, type or direction of the roads is unknown, footpaths in rural areas are very spotty. Basically anything that requires local human verification (addresses, business location, etc) is off limits and accuracy in those points comes from pre-ban times (or illegal activity).

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