Hmmm Im far from an expert at this, but i do know that terrain meshes created from space shuttle scans of the earth are freely availible on the net.
Microsoft flight sim had a number of freeware addons created around this data.
Now i know that the size of these files can be large. So why not raise the DEM of the most inportant places? IE murmansk and nova scotia. If its possible just to raise the LOD for a local area surely that could be an answer?
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