Abstract: Taking the domestic SuperView satellite images as the data source, the coastal shallow water area, reservoir shallow water area in Shenzhen are selected as the research objects,due to the influence of the substrate in the shallow water area,the reflectance of coastal water and coastal soil is close, which causes the difficulty and poor accuracy of water boundary extraction. Using the improved coefficient of variation method to screen the water index, combined with DEM data to modify the water boundary line and denoise, the shallow water boundary is obtained more accurately.The results show that the overall accuracy of discrimination of coastal, reservoir shallow water in the 0.5 m resolution satellite images is 98.75% and 91.10% respectively, the accuracy and stability of shallow water extraction are significantly improved.

Key words: high-resolution satellite images, DEM data, shallow water, water body index