You can also use MICRODEM to simply export a 3D model (.OBJ) file of the displayed map. I used the GPS tool to enter real-world GPS coordinates for the 4 corners of my 40 acre property, then zoomed to that region
amp; exported a 3D model of it. This creates a VERY large file (mine was 205MB) which can then be edited in most 3D programs.
Alternately, you can also create a 3D height field (elevated mesh) using Rhinocerous, using a greyscale image of your property terrain data. ;) This creates a much smaller file to work with, as well.