When dealing with rounded earth you will have to deal with the various problems of 2D to 3D So the mapping of the SRTM data or whatever to it without major problems is unlikely.
The folks at Celestia seem to have that figured out tho. Perhaps you can see how they did it?
To be honest I think a rounded earth is a waste of time. You are not going to be simulating aircraft flying high enough or other factors that desperately need a rounded earth.
The data in my links in the other topic is supposed to be laid out flat if I remember correctly.
I have a small concern here. You seem to call this sim a community subsim. Does this mean that you will fully open up development through some sort of version management? I hope you will allow others to work on the code.
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