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Article

Systematic Water Fraction Estimation for a Global and Daily Surface Water Time-Series

1
German Remote Sensing Data Center (DFD), German Aerospace Center (DLR), Münchener Str. 20, 82234 Wessling, Bavaria, Germany
2
Institute of Geography, University of Innsbruck, Innrain 52f, 6020 Innsbruck, Tirol, Austria
3
Institute of Geology and Geography, Chair of Remote Sensing, University of Würzburg, Oswald-Külpe-Weg, 97074 Würzburg, Bavaria, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Eufemia Tarantino
Remote Sens. 2021, 13(14), 2675; https://doi.org/10.3390/rs13142675
Received: 28 May 2021 / Revised: 25 June 2021 / Accepted: 3 July 2021 / Published: 7 July 2021
(This article belongs to the Section Environmental Remote Sensing)
Fresh water is a vital natural resource. Earth observation time-series are well suited to monitor corresponding surface dynamics. The DLR-DFD Global WaterPack (GWP) provides daily information on globally distributed inland surface water based on MODIS (Moderate Resolution Imaging Spectroradiometer) images at 250 m spatial resolution. Operating on this spatiotemporal level comes with the drawback of moderate spatial resolution; only coarse pixel-based surface water quantification is possible. To enhance the quantitative capabilities of this dataset, we systematically access subpixel information on fractional water coverage. For this, a linear mixture model is employed, using classification probability and pure pixel reference information. Classification probability is derived from relative datapoint (pixel) locations in feature space. Pure water and non-water reference pixels are located by combining spatial and temporal information inherent to the time-series. Subsequently, the model is evaluated for different input sets to determine the optimal configuration for global processing and pixel coverage types. The performance of resulting water fraction estimates is evaluated on the pixel level in 32 regions of interest across the globe, by comparison to higher resolution reference data (Sentinel-2, Landsat 8). Results show that water fraction information is able to improve the product’s performance regarding mixed water/non-water pixels by an average of 11.6% (RMSE). With a Nash-Sutcliffe efficiency of 0.61, the model shows good overall performance. The approach enables the systematic provision of water fraction estimates on a global and daily scale, using only the reflectance and temporal information contained in the input time-series. View Full-Text
Keywords: earth observation; landsat; MODIS; remote sensing; probability; Sentinel-2; subpixel; water earth observation; landsat; MODIS; remote sensing; probability; Sentinel-2; subpixel; water
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MDPI and ACS Style

Mayr, S.; Klein, I.; Rutzinger, M.; Kuenzer, C. Systematic Water Fraction Estimation for a Global and Daily Surface Water Time-Series. Remote Sens. 2021, 13, 2675. https://doi.org/10.3390/rs13142675

AMA Style

Mayr S, Klein I, Rutzinger M, Kuenzer C. Systematic Water Fraction Estimation for a Global and Daily Surface Water Time-Series. Remote Sensing. 2021; 13(14):2675. https://doi.org/10.3390/rs13142675

Chicago/Turabian Style

Mayr, Stefan, Igor Klein, Martin Rutzinger, and Claudia Kuenzer. 2021. "Systematic Water Fraction Estimation for a Global and Daily Surface Water Time-Series" Remote Sensing 13, no. 14: 2675. https://doi.org/10.3390/rs13142675

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