Observed Water Extent (GFM)

Layer name	Observed Water Extent (GFM)
Tag	Flood
Folder	Eo Satellite
Source	GFM
Description	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. 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.
Screenshot
Properties
Available variables	Observed Water Extent
Available accumulations
Available interpolation algorithms
Available filters
Spatial aggregations