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Article

Evaluation of Atmospheric Correction Algorithms for Sentinel-2-MSI and Sentinel-3-OLCI in Highly Turbid Estuarine Waters

1
Laboratoire d’Océanographie de Villefranche, UMR7093, CNRS-Sorbonne Université, 06230 Villefranche-sur-Mer, France
2
Flemish Institute for Technological Research (VITO), 2400 Mol, Belgium
3
Instituto de Astronomía y Física del Espacio (IAFE), CONICET-Universidad de Buenos Aires, Pabellón IAFE, Ciudad Universitaria (C1428ZAA), Ciudad Autónoma de Buenos Aires, Argentina
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(8), 1285; https://doi.org/10.3390/rs12081285
Received: 28 February 2020 / Revised: 8 April 2020 / Accepted: 15 April 2020 / Published: 18 April 2020
(This article belongs to the Section Ocean Remote Sensing)
The present study assesses the performance of state-of-the-art atmospheric correction (AC) algorithms applied to Sentinel-2-MultiSpectral Instrument (S2-MSI) and Sentinel-3-Ocean and Land Color Instrument (S3-OLCI) data recorded over moderately to highly turbid estuarine waters, considering the Gironde Estuary (SW France) as a test site. Three spectral bands of water-leaving reflectance ( R h o w ) are considered: green (560 nm), red (655 or 665 nm) and near infrared (NIR) (865 nm), required to retrieve the suspended particulate matter (SPM) concentrations in clear to highly turbid waters (SPM ranging from 1 to 2000 mg/L). A previous study satisfactorily validated Acolite short wave infrared (SWIR) AC algorithm for Landsat-8-Operational Land Imager (L8-OLI) in turbid estuarine waters. The latest version of Acolite Dark Spectrum Fitting (DSF) is tested here and shows very good agreement with Acolite SWIR for OLI data. L8-OLI satellite data corrected for atmospheric effects using Acolite DSF are then used as a reference to assess the validity of atmospheric corrections applied to other satellite data recorded over the same test site with a minimum time difference. Acolite DSF and iCOR (image correction for atmospheric effects) are identified as the best performing AC algorithms among the tested AC algorithms (Acolite DSF, iCOR, Polymer and C2RCC (case 2 regional coast color)) for S2-MSI. Then, the validity of six different AC algorithms (OLCI Baseline Atmospheric Correction (BAC), iCOR, Polymer, Baseline residual (BLR), C2RCC-V1 and C2RCC-V2) applied to OLCI satellite data is assessed based on comparisons with OLI and/or MSI Acolite DSF products recorded on a same day with a minimum time lag. Results show that all the AC algorithms tend to underestimate R h o w in green, red and NIR bands except iCOR in green and red bands. The iCOR provides minimum differences in green (slope = 1.0 ± 0.15, BIAS = 1.9 ± 4.5% and mean absolute percentage error (MAPE) = 12 ± 5%) and red (slope = 1.0 ± 0.17, BIAS = −9.8 ± 9% and MAPE = 28 ± 20%) bands with Acolite DSF products from OLI and MSI data. For the NIR band, BAC provides minimum differences (slope = 0.7 ± 0.13, BIAS = −33 ± 17% and MAPE = 55 ± 20%) with Acolite DSF products from OLI and MSI data. These results based on comparisons between almost simultaneous satellite products are supported by match-ups between satellite-derived and field-measured SPM concentrations provided by automated turbidity stations. Further validation of satellite products based on rigorous match-ups with in-situ R h o w measurements is still required in highly turbid waters. View Full-Text
Keywords: ocean color remote sensing; atmospheric correction; Landsat-8-OLI; Sentinel-2-MSI; Sentinel-3-OLCI; highly turbid waters; suspended particulate matter ocean color remote sensing; atmospheric correction; Landsat-8-OLI; Sentinel-2-MSI; Sentinel-3-OLCI; highly turbid waters; suspended particulate matter
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MDPI and ACS Style

Renosh, P.R.; Doxaran, D.; Keukelaere, L.D.; Gossn, J.I. Evaluation of Atmospheric Correction Algorithms for Sentinel-2-MSI and Sentinel-3-OLCI in Highly Turbid Estuarine Waters. Remote Sens. 2020, 12, 1285. https://doi.org/10.3390/rs12081285

AMA Style

Renosh PR, Doxaran D, Keukelaere LD, Gossn JI. Evaluation of Atmospheric Correction Algorithms for Sentinel-2-MSI and Sentinel-3-OLCI in Highly Turbid Estuarine Waters. Remote Sensing. 2020; 12(8):1285. https://doi.org/10.3390/rs12081285

Chicago/Turabian Style

Renosh, Pannimpullath Remanan, David Doxaran, Liesbeth De Keukelaere, and Juan Ignacio Gossn. 2020. "Evaluation of Atmospheric Correction Algorithms for Sentinel-2-MSI and Sentinel-3-OLCI in Highly Turbid Estuarine Waters" Remote Sensing 12, no. 8: 1285. https://doi.org/10.3390/rs12081285

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