The main feature type in the study area includes the water body (including the original water and
flood water), vegetation and residential areas. Using the 4, 3, 2 band of environmental disaster reduction
satellite CCD data to make standard false color composite, the interpretation keys was established
through field investigation using GPS to locate the typical objects of the study area combined with the
corresponding points of the image features for visual interpretation (Table 1). Flood water would be
identified through interpretation keys from the remote sensing images.