Unmanned aerial systems (UAS) provide a viable alternative to the use of
conventional aerial photography.
Such systems incorporate the use of a small
unmanned aerial vehicle (UAV) and low cost imaging sensors such as off-theshelf
digital cameras and GPS/IMU units.
When compared to traditional airborne
platforms, UAVs have the ability to provide data at a higher temporal resolution,
more economic cost, avoid cloud obstructions, provide more flexible data
acquisition, and still keeping high accuracy potential
(Aber et al., 2010;Eisenbeiβ, 2009; Remondino et al., 2011).