Creating a 3d STL terrain model from usgs or google earth for CNC

Thank you Geo. I downloaded the model you made and it is exactly what I wanted to do. Trouble is I dont know how you did it (sorry for being dense - it’s my first model in Sketch, have watched the Lynda.com videos on essential training, but I am just not finding any training specific to creating a solid out of non-flat terrain).

Could you walk me through how you created the solid from a single vessel? I see you have the terrain shape I had and assume that is the one part of my model you used, but then you somehow extruded that into a solid. That is the piece I am missing.

Thanks again for your coaching - it is extremely helpful

Mike