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

[Geo]

Hi Gary

@gary545

I am trying to model Lake Tahoe and it will require hundreds of grabs and not practical.

Given Lake Tahoe is some 22 miles long; modeling the lake and surrounding terrain would certainly prove problematic via the Add Location feature or whatever other means one might use.
SketchUp’s OpenGL rendering engine tends to have tantrums at such great distances.