I work for a heavy / highway construction company, we are looking into survey drones for topographic surveying, as well as point references and 3d mapping etc. I bought a dji phantom when they first came out, weve been using a dji vision plus for aerial photos of our jobsites. Consider me a newb for the surveying end of this, but correct me if I'm wrong, but for surveying, don't I just need an auto pilot heavy lifting copter, with a gps camera that I can control from the ground? Then get the correct software(Pix4d)? I am being quoted 50000 dollars and I just think that is ridiculous.