Abstract:

In view of the great impact of hillshades on water extraction accuracy of SAR images,this paper proposes a method for quickly,accurately and automatically removing the hillshade in water extraction.This method uses an improved Otsu method to segment the DEM data,and then match the elevation values large data and water crude extract data for determining and removing the hillshade.The experiments show that this method can improve the accuracy of the water extraction with lower water extraction false alarm rate.

Key words: DEM;SAR;water extraction