June 21, 2014
Any drone (or UAV) will fly in accordance with the natural aeronautical physics of the air – which means tip, tilt and yaw of the airframe during flight as the air thermodynamic and wind turbulence forces effect. So unless compensated for, a rigid camera body within any drone airframe will of course produce photos of the ground with the effects of tip, tilt and yaw impressed on the raw images – which effectively means distortion and hence a significant metric error source for mapping. DroneMetrex has developed its own DMX-FMS (Photogrammetric Flight and sensor control Management System) integrated into the firmware of the autopilot. Each photo is captured as nadir (pointing vertically downwards regardless of the tip and tilt of the airframe) because our DMX-FMS controls the movement of our Dynamic-stabilised Active Mount to counter-react and compensate for the airframe tips and tilts, as well as the yaw (rotation “crab”). It is exactly why the large photogrammetric cameras are operated with the same mount on large manned aircrafts.