Mapping extent of flooded areasusing Sentinel-1 satellite image

Abstract

      This paper presents a methodology to determine inundation area in a flood event in Ha Tinh Province, Vietnam, by applying Synthetic Aperture Radar (SAR) image processing, in combination with Digital Elevation Model (DEM) for threshold detection. Sentinel-1 images were down loaded from an open source provided by European Space Agency (ESA). DEM data were collected from United States Geological Survey (USGS). The method uses thresholds to distinguish flooded area from unflooded area. Then based on topographic correlations to identify more appropriate floodplains. The study suggesteda quickerway not only to detect flooded areas, but also to validate the use of hydraulic models in the regions where no observation data were collected.