Small unmanned aerial systems (sUAS, a.k.a., "drones") have become widespread tools for many types of geological studies. For over 15 years, our research group has worked with close-range photogrammetry (ground-based and aerial) and aerials systems, starting with kites. I, as well as some others in my research group, maintain a FAA Part 107 sUAS certification.
We currently have a range of aerial systems including various kites (with picavet rigs), a 3-cubic-meter aerostat, several fixed-wing aircraft, and a number of multi-rotored aircraft.