Open AccessOn the equivalence of near-surface methods to determine the water-leaving radiance
Author(s) -
Giuseppe Zibordi,
Marco Talone
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.28.003200
Subject(s) - radiance , remote sensing , hyperspectral imaging , radiometer , optics , nadir , radiometry , environmental science , sky , physics , geology , meteorology , astronomy , satellite
The equivalence of two radiometric methods relying on a single nadir-view optical sensor to determine the water-leaving radiance L W , namely the Single Depth Approach (SDA) and the Sky-Blocked Approach (SBA), was investigated applying identical hyperspectral radiometers operated on the same deployment platform. Values of L W from SDA and SBA measurements performed in the Black Sea across a variety of waters during ideal illumination conditions and with low-to-slight sea state, exhibited mean absolute differences within 0.5% in the blue-green spectral region and 2% in the red. This result, benefitting of a comprehensive parameterization of optical processes in combination with the characterization of sensors non-linearity, in-water response and reproducibility of absolute radiometric calibrations, indicated ample equivalence of the two near-surface methods in terms of performance and data reduction needs.