The continuous trend in the miniaturisation of electronics enables the production
of smaller UAVs while simultaneously equipping them with cameras and other
sensors to support aerial geo-data collection (Lemmens, 2011). With low cost,
small, and lightweight integrated GNSS and inertial navigation systems, UAVs
can be navigated with decimetre accuracy and the acquired orientation
parameters can reduce the number of ground control points needed for postprocessing
(Eisenbeiß, 2004).