I am a young attorney who was an engineer before going to the dark side. As a result, I have some experience with computer aided drafting and some programming. I would like to use blender to create some 3d models for a pending environmental case. I would like to create a landscape that illustrates the exact topography of the property at issue before development. I am trying to find the easiest way to do this. I can import the property survey with all the elevation lines as a background image. From here I am at a loss for an easy solution. In Autocad we can draw a line that follows the contours of the background image and then pull that line up to the correct elevation. Any suggestions? I hope I am missing an easy option. Below is a small of example of something similar to what I am trying to follow.