Preprint Technical Note Version 1 Preserved in Portico This version is not peer-reviewed

Ulyssys Water Quality Viewer Technical Description Supplementary

Version 1 : Received: 30 January 2020 / Approved: 31 January 2020 / Online: 31 January 2020 (11:59:22 CET)

How to cite: Zlinszky, A.; Padányi-Gulyás, G. Ulyssys Water Quality Viewer Technical Description Supplementary. Preprints 2020, 2020010386 (doi: 10.20944/preprints202001.0386.v1). Zlinszky, A.; Padányi-Gulyás, G. Ulyssys Water Quality Viewer Technical Description Supplementary. Preprints 2020, 2020010386 (doi: 10.20944/preprints202001.0386.v1).

Abstract

Easy to use satellite-based water quality visualizations are needed for monitoring and understanding coastal and inland waters, but to date, no publicly accessible real-time global visualization system was in place. Here we introduce the Ulyssys Water Quality Viewer (UWQV), a Sentinel Hub EO Browser Custom script designed for qualitative views of aquatic chlorophyll and suspended sediment concentrations. The viewer avoids unmixing of the chlorophyll and suspended sediment spectral signal by visualizing these parameters together, with high concentrations of suspended sediment obscuring chlorophyll if present. Cloud masking uses the Hollstein and Braaten algorithms (existing EO Browser custom script code), additionally water surfaces are masked using the Normalized Differential Water Index. Chlorophyll is estimated using reflectance line height-based indicators such as fluorescence line height and maximum chlorophyll index. Suspended sediment is visualized based on single-band reflectances at 620 or 700 nm. Data sources are Sentinel-2 and Sentinel-3 images, allowing either 20 m spatial resolution or up to daily imaging. This visualization system is easy to operate and interpret, and combined with the data service capacity of the Sentinel Hub, it is expected that UWQV will contribute to monitoring of remote water bodies and to our overall understanding of physical limnology and aquatic ecology.

Supplementary and Associated Material

Subject Areas

remote sensing; water quality; chlorophyll concentration; suspended sediment; sentinel-2; sentinel-3; open science

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