We hired Frontline Surveying and Mapping from Marietta to do the topographic survey for neoTerra. We had them do a 2-foot contour interval. Since one of our goals is to preserve as many of the larger trees as possible, we also asked them to plot the locations of the larger trees in the potential construction area.
The crew from Frontline was great. They arrived right on time and walked the site with us to get a good understanding of where we planned to site the house and the trees we wanted to plot.
You can orient the model to face true south and get an idea of how the sun will illuminate the site.
Simple things like this can help a lot when you're working remotely. If someone cuts the wrong tree(s) down it will take 50 years to grow new ones.