Access the Webmap here: Satellite-Derived Flood Extents

About the Webmap:

Sentinel 1 – RGB Flood Map

The Alaska Satellite Facility developed a false color Red, Green, Blue (RGB) composite image of the Sentinel-1A/B Synthetic Aperture Radar (SAR) instrument which assigns the co- and cross-polarization information to a channel in the RGB composite. When used to support a flooding event, areas in blue denotes water present at the time of the satellite overpass before or after the start of the flooding event.
Satellite: Synthetic Aperture Radar on European Space Agency’s (ESA) Copernicus Sentinel 1 A/B satellite; 30 m resolution
Credits: Copernicus Sentinel data (2019), processed by ESA, Alaska Satellite Facility, and NASA Marshal Space Flight Center.
Sentinel 1 – Water Extent Map
This product shows three areas: known reference water (blue), anomalous water identified outside the known reference water areas (red), and water detected in known wetlands or barren land (tan). This product can be used to perform a change analysis due to the flooding. \
Satellite: Synthetic Aperture Radar on European Space Agency’s (ESA) Copernicus Sentinel 1 A/B satellite; 30 m resolution
Credits: Copernicus Sentinel data (2019), processed by ESA, Alaska Satellite Facility, and NASA Marshal Space Flight Center.
Landsat 8 Natural Color RGB
Areas of water will appear blue, healthy green vegetation will appear as bright green, urban areas in various shades of magentas, clouds appear as white or bright blue, and bare soils being multicolor dependent on their makeup.
Satellite:  Landsat 8 Operational Land Imager (OLI); 30m resolution.
Credits: NASA/MSFC, USGS.
VIIRS 5 Day Composite Floodwater Extent
Visible Infrared Imaging Radiometer Suite (VIIRS) – This product is created daily by the modeling group within the FEMA Geospatial Response Team using the Daily product. This composite flood extent saves the max water fraction percentages over a moving window of 5 days to improve obscuration due to cloud cover. Values are binary so the map output show red pixels where at least 40% of the pixel was covered with water during the five-day moving window.
Satellite: NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi-NPP) satellite.
Credits: NASA/NOAA
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