Easily Implemented Methods of Radiometric Corrections for Hyperspectral–UAV—Application to Guianese Equatorial Mudbanks Colonized by Pioneer Mangroves

Hyper-DRELIO (Hyperspectral DRone for Environmental and LIttoral Observations) is a custom, mini-UAV (unmanned aerial vehicle) platform (<20 kg), equipped with light push broom hyperspectral sensor combined navigation module measuring position orientation. Because of the particularities UAV surveys (low flight altitude, small spatial scale, high resolution), dedicated pre-processing methods have to be developed when reconstructing imagery. This article presents light, easy-implementation, in situ methods, using only two Spectralon® field spectrometer, allowing performance an initial calibration order correct “vignetting effects” standardization convert digital numbers (DN) collected by camera reflectance, taking into account time-varying illumination conditions. Radiometric corrections are applied subset dataset above mudflats colonized pioneer mangroves French Guiana. The efficiency radiometric assessed comparing spectra from imagery spectrometer measurements intertidal benthic biofilm mangroves. shapes were consistent, spectral angle mapper (SAM) distance was 0.039 0.159 These preliminary results provide new perspectives quantifying mapping at scale Guianese mudbanks system, given their importance coastal food webs, biogeochemical cycles, sediment stabilization.