Hey Kelly the only thing in this regard that I can think of off the top of my head is sometimes we fly in steep terrain and want to keep the camera close to a set AGL. When I create plans in Tower for this I cross reference with elevations in Google Earth. Its a little painstaking but the models Iv been able to do have been awesome. Two examples of using this is a slope that wildfire nuked off and we modeled it to monitor runoff and erosion. The second was a wagon trail that we wanted to fly a narrow strip out to the end of radio range and back, this when done in terrain thats not level can be rough if you dont change the altitudes.