I've actually started studying for the FAA Suas rating but haven't tested yet. The problem with writing the program is I have no coding ability at all. There's a shit load of apps out there for it but I'll I've used is DJI go and Co-pilot (let's you give a camera view to another device). Also one of the downfalls of the Phantom is no zoom, I think the Inspire does zoom though but at a base of $2500+ I haven't gotten to play with one. As far as mapping goes there are a lot of programs out there and some add on hardware (about 3k) to map farms for drainage, over saturation, dry areas and good crop.