3DroneMapping has been testing a PPK system for the past year. The point of PPK (or Post Processing Kinematic) is not just to improve internal photogrammetric model orientations, but also is general recognised as a way of undertaking full-scale surveys at the same accuracy but without having to place time-consuming ground control points. 3DroneMapping setup a calibration site to test the claims made by manufacturers and ultimately for our own quality assurance that what we pu