Anyone who tries to make large maps using Drone Deploy with a DJI phantom will find beyond around a hectare, that the elevation image will have an unacceptable 'doming effect' on the image, that the centre of the map can be up to 2-3 metres higher than the periphery. This is a well known issue, based around issues of lens asymmetry, and cannot be easily corrected. The solution is to take oblique photographs as well and DD had a useful feature until late last year, where the drone would circle and take obliques at the end of the survey.
Alas DD have now dropped this is their latest release, with something called 3-D beta. I am sure it may be better, but we cannot try it, as this feature is inexplicably turned off for all the DJI Phantom 3 drones. This means that DD is now practically useless for all serious users of P3 drones, who want to generate DTM's and .las images.
It is very simple change please can you reinstate the circular oblique function - it worked well (PS I was filming with Discovery Week, and it was deeply embarrassing that I was unable to produce the promised map)