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The Poyang Lake is the largest fresh water lake in china and also is the flood-prone belt. It's very important to extract the water body information of the Poyang Lake from the remote sensing images and real time monitoring the dynamic change of the Poyang Lake with the technology of GIS. The spatial distribution of the water level of the Poyang Lake is nonuniform. We can’t get the water level information of the whole lake area. The ASAR images have advantages of all-weather, weather resistant, sensitive to the water, etc., it's a good tool to extract the water information. The writer extracts the border line of the Poyang Lake through the ASAR images and combined with the high precision DEM data of the Poyang Lake area to get the water information of the border and reflect the spatial distribution of the water. This method is easy, quick and accurate, and could get the visualized graphic, the results could provide scientific evidences for the disaster prevention and mitigation, the regulation and usage of the reservoir and the production of fish, forestry, animal, husbandry and fishery, etc

Study on the Nonuniform Spatial Distribution of Water Level in Poyang Lake Based on ASAR Images and DEM