System vicarious calibration of GCOM-C/SGLI visible and near-infrared channels

Abstract Vicarious calibration coefficients ( k v ) of Second-generation GLobal Imager (SGLI) for ocean color processing were derived using in-situ radiometric buoy measurements from the Marine Optical BuoY (MOBY) and BOUée pour l'acquiSition d'une Série Optique à Long termE (BOUSSOLE). Two aerosol-model look up tables (LUTs) used in GCOM-C aerosol retrieval algorithm (LUT-A) previous version atmospheric correction (LUT-B) tested procedures to calculate retrieve remote sensing reflectance R rs optical thickness (AOT). Bias processed compared AERONET-OC was reduced by applying determined (i.e., corrected SGLI radiance = original radiance/ ). LUT-A yielded smaller AOT bias AOT; on other hand, LUT-B gave noise due gentle slope even though it caused overestimation. When adjusting measurements, about 1.1 1.2 near-infrared (NIR) channel. However, NIR channel close 1.0 when land surface Radiometric Calibration Network (RadCalNet) used. The with MOBY BOUSSOLE are currently adopted standard processing. Improvement is needed, however, design an optimal LUT suitable both purposes.