While working on site plans I drove by the site and noticed that the rear of the lot slopes dramatically up to the railroad tracks. In order to have a more accurate portrayal of what can be built there I thought I should try to create a topography map in Revit. I first tried finding topographical maps of the area, which were old and not very detailed. Further research showed me that I could use sketchup to import a google earth model and then export that as a dwg file. Very easy! Once in Revit I imported the cad file and went into the massing and site area and revit created the map for me.
here is a link to the youtube video that I used to help me out with this. It ended up being far easier than I had anticipated.