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The solution proposed by Spacedman is easy to do with GRASS GIS and Python scripting or or OpenJump's "planar graph" command. 1) Generate random points (or specific points) from the DEM and sample elevation at each of these points. (v.random, v.drape) 2) Compute a TIN with the Delaunay algorithm (v.delaunay, 3D) 3) Compute the Planar Graph (with ...

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