In general, Evil Transform is used to convert WGS84 <-> GCJ-02:
https://github.com/googollee/eviltransform

So, most likely, you need to create a class that inherits OnlineMapsProjectionSphericalMercator, which will convert the coordinates to GCJ, and specify the projection for amap provider (OnlineMapsProvider.projection).
http://infinity-code.com/doxygen/online … cator.html
http://infinity-code.com/doxygen/online … 1ef1b24402

I‘m using onlinemaps to create a game that can combine the map to show the actual terrain. The map provider is Amap and I get elevation data from bingmap. But amap uses GCJ02 coordinates system in China, and bingmap uses WGS84. How do I match them?

Thank you in advance for your reply.