Hi Bill I have a DJI Phantom 4 drone and use DJI apps to control it (DJI Go 4 - Needed for DJI drone diagnostics. Also has some intelligent flight modes such as oblique Point of Interest. I use DJI GS Pro app f or planning photogrammetry missions - Nadir and Oblique). These apps are okay but limited in camera control at way points. For instance, you can only program a single altitude (based on take-off elevation) for all camera positions so no good if you want to create a constant photo resolution at a mine site or over hilly terrain. You would need to pay for a decent app for that. I have also tried Pix4d and Drone Deploy. - pretty similar offerings to the DJI apps. There's a very nice looking app from http://droneharmony.com/ who (I understand) Bentley have just Partnered with. I haven't tried yet but will do soon. Hope it helps
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