FLOOD EXTENT MAPPING USING DUAL-POLARIMETRIC SENTINEL-1 SYNTHETIC APERTURE RADAR IMAGERY
- 1USRA, NASA-GSFC, Greenbelt, MD, 20771 USA
- 2NASA-GSFC, Greenbelt, MD, 20771 USA
- 3Florida International University, Miami, FL, 33199 USA
Keywords: Flood, Polarimetry, SAR, Radar, Harvey, Sentinel-1
Abstract. Rapid generation of synthetic aperture radar (SAR) based flood extent maps provide valuable data in disaster response efforts thanks to the cloud penetrating ability of microwaves. We present a method using dual-polarimetric SAR imagery acquired on Sentinel-1a/b satellites. A false-colour map is generated using pre- and post- disaster imagery, allowing operators to distinguish between existing standing water pre-flooding, and recently flooded areas. The method works best in areas of standing water and provides mixed results in urban areas. A flood depth map is also estimated by using an external DEM. We will present the methodology, it’s estimated accuracy as well as investigations into improving the response in urban areas.