A Study on Information Extraction of Water System in Semi-arid Regions with the Enhanced Water Index(EWI) and GIS Based Noise Remove Techniques

Information extraction of water system in basin is the first step of the development of water resources.NDWI and MNDWI can not distinguish the semidry watercourse from the noise in semi-arid regions.An enhanced water index(EWI) has been proposed in this paper based on the spectral signatures of water system and background noise.The EWI can significantly distinguish the semidry watercourse from the noise.GIS techniques of removing noise improved the traditional method with shape index and efficiently removed the noise.EWI and GIS techniques can extract the water system in semi-arid regions faster,accurately and simply.