Estimation of colored dissolved organic matter using Sentinel-2 data in the coastal waters of Singapore

2020 ◽  
Vol 14 (03) ◽  
Author(s):  
Joel Wong ◽  
Soo C. Liew ◽  
Elizabeth W.-S. Wong ◽  
Sandric C. Y. Leong
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Coastal Waters ◽  
Colored Dissolved Organic Matter ◽  
Sentinel 2

Remote estimation of colored dissolved organic matter and chlorophyll-a in Lake Huron using Sentinel-2 measurements

2017 ◽  
Vol 11 (03) ◽  
pp. 1 ◽  
Author(s):  
Jiang Chen ◽  
Weining Zhu ◽  
Yong Q. Tian ◽  
Qian Yu ◽  
Yuhan Zheng ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Chlorophyll A ◽  
Lake Huron ◽  
Colored Dissolved Organic Matter ◽  
Remote Estimation ◽  
Sentinel 2

scholarly journals Validation of Water Quality Monitoring Algorithms for Sentinel-2 and Sentinel-3 in Mediterranean Inland Waters with In Situ Reflectance Data

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 686
Author(s):  
Xavier Sòria-Perpinyà ◽  
Eduardo Vicente ◽  
Patricia Urrego ◽  
Marcela Pereira-Sandoval ◽  
Carolina Tenjo ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Optical Sensors ◽  
Satellite Image ◽  
European Space Agency ◽  
Water Quality Monitoring ◽  
Inland Waters ◽  
Colored Dissolved Organic Matter ◽  
Sentinel 2

Freshwater quality maintenance is essential for human use and ecological functions. To ensure this objective, governments establish programs for a continuous monitoring of the inland waters state. This could be possible with Sentinel-2 (S2) and Sentinel-3 (S3), two remote sensing satellites of the European Space Agency, equipped with spectral optical sensors. To determine optimal water quality algorithms applicable to their spectral bands, 36 algorithms were tested for different key variables (chlorophyll a (Chl_a), colored dissolved organic matter (CDOM), colored dissolved organic matter (TSS), phycocyanin (PC) and Secchi disk depth (SDD)). A database of 296 water-leaving reflectance spectra were used, as well as concomitant water quality measurements of Mediterranean reservoirs and lakes of Spain. Two equal data sets were used for calibration and validation. The best algorithms were recalculated using all database and used the following band relations: SDD, R560/R700; CDOM, R665/R490; PC, R705/R665 for S2 and R620, R665, R709 and R779 for S3, using a semi-analytical algorithm; R700 for TSS < 20 mg/L and R783/R492 (S2) or R779/R510 (S3) for TSS > 20 mg/L; and for Chl_a, the maximum (R443; R492)/R560 for Chl_a < 5 mg/m3 and R700/R665 for Chl_a > 5 mg/m3. A preliminary test with a satellite image in a well-known reservoir showed results consistent with the expected ranges and spatial patterns of the variables.

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