I want to make a surface, below a surface. Say, the bottom of a body of water, or an existing surface and a known elevation to remove.
What is the best way to do this. I already have the existing Topo. Should I creat another surface using a .CSV file with N,E, and elevations that we want to remove to, then calculate a Volume?
THe volume is my ultimate goal.
Thanks so much for any help you can provide.
-me-