Abstract
The extraction of water boundary is the basis for measurement of the watershed area and the extraction of other water parameters, which has an important impact on calculation accuracy of hydrological analysis. With the rapid development of remote sensing technology, the extraction of water system and basin boundary is getting more and more importance and the extraction methods have also made a new progress. This paper takes the acquisitive TM image of Dianchi Lake of 1992. Firstly the image is enhanced by Tassled Cap Transformation, and then band ratio (b3/b1). By setting appropriate threshold to the enhanced image, we can extract the water boundary more quickly and effectively, and have achieved good results.
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