Journal
REMOTE SENSING
Volume 11, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/rs11060668
Keywords
validation; atmospheric correction; sensitivity study; ocean color; OLCI; Sentinel-3; match-ups exercise; ASD; water-leaving reflectance; coastal waters
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Funding
- Centre National d'Etudes Spatiales (CNES) through the TOSCA program
- Centre National de la Recherche Scientifique (Guyane)
- European Space Agency for the MERIS validation and algorithm 4th reprocessing [ARG/003-025/1406/LOG]
- Universite du Littoral Cote d'Opale
- Region Hauts-de-France
- CNES
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The Sentinel-3A satellite was launched on 16 February 2016 with the Ocean and Land Colour Instrument (OLCI-A) on-board for the study of ocean color. The accuracy of ocean color parameters depends on the atmospheric correction algorithm (AC). This processing consists of removing the contribution of the atmosphere from the total measured signal by the remote sensor at the top of the atmosphere. Five ACs: the baseline AC, the Case 2 regional coast color neural network AC, its alternative version, the Polymer AC, and the standard NASA AC, are inter-compared over two bio-optical contrasted French coastal waters. The retrieved water-leaving reflectances are compared with in situ ocean color radiometric measurements collected using an ASD FielSpec4 spectrometer. Statistical and spectral analysis were performed to assess the best-performing AC through individual (relative error (RE) at 412 nm ranging between 23.43 and 57.31%; root mean squared error (RMSE) at 412 nm ranging between 0.0077 and 0.0188) and common (RE(412 nm) = 24.15-50.07%; RMSE(412 nm) = 0.0081-0.0132) match-ups. The results suggest that the most efficient schemes are the alternative version of the Case 2 regional coast color neural network AC with RE(412 nm) = 33.52% and RMSE(412 nm) = 0.0101 for the individual and Polymer with RE(412 nm) = 24.15% and RMSE(412 nm) = 0.0081 for the common ACs match-ups. Sensitivity studies were performed to assess the limitations of the AC, and the errors of retrievals showed no trends when compared to the turbidity and CDOM.
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