I would like to get accurate elevation maps with a drone. Is there an inexpensive way to do this? Ive used daftlogic abit. Im new to drones but i want to overlay an ariel photo with an elevation map. Ill use it in drainage and in the bush for mapping new sugarbush sap lines. Could i get by with a DJI Phantom and overlay a map or do i need a 10,000 dollar drone like the tile guys use?