We recently published/got accepted new results on the UAS-spectroscopy for solar-induced chlorophyll fluorescence project.
The paper entitled Footprint Determination of a Spectroradiometer Mounted on an Unmanned Aircraft System examines the geometric and radiometric accuracy of spectroradiometer footprints projected onto a digital surface model. The paper can be accessed here.
A second work: Solar-Induced Chlorophyll Fluorescence Measured From an Unmanned Aircraft System: Sensor Etaloning and Platform Motion Correction looks at the influence of spectroradiometer characteristics, and orientation of a cosine sensor for downwelling irradiance measurements, on solar-induced chlorophyll fluorescence. The work is currently in print.