S-1 Observed Water Extent
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The Sentinel-1 Observed Water Extent identifies the pixels classified as open and calm water using Sentinel-1 SAR backscatter intensity and is derived using the ensemble flood mapping algorithm described in section 0.
To map water extent pixels for a certain date, the algorithm uses as input the Sentinel-1 data overpass plus offline-generated Sentinel-1 SAR parameters and auxiliary thematic datasets such as Exclusion Mask and topography(e.g. DEM and HAND index).
The relative orbit path information, to select the corresponding offline-generated Sentinel-1 SAR parameters, is extracted from the“Sentinel-1 Metadata”. All the processing is done at the 20m-sampling of the Sentinel-1 pre-processed data cube. The Sentinel-1 Observed Water Extent values are described below.
