When I first began learning with the phantom 3, I flew grids by free flying and produced great topographic results. About a month ago, I started experimenting with autonomous flight and collecting photographs on a true grid. I have calculated my desired GSD and flown the appropriate heights with plenty of overlap, and I have not been able to produce one result that didn’t have a distortion. The distortions range from slight to completely absurd. My latest attempt placed the photos and the automatic tie points on the same plane. I am fairly confident that the problem is being caused by the camera model settings. I have tried every setting that I can think to try, but I have yet to resolve the issue. Any help would be great appreciated.