Abstract
It is the basis for river management,development and remediation to extract and acquire accurate water information using remote sensing and GIS techniques.A net river region of Foshan in the Pearl River Delta was selected as study area.After analyzing the spectral characteristics of river water bodies and other objects in Landsat TM images,several water indices models were established.Among these models,ratio water indices model(RWI) proved to be the best one.Then,the results of RWI were taken to get water thematic images by using special clustering analysis method,as a result,the main water information were extracted from other spectrums.In addition to these,the missing small rivers were checked out by the shape index.Accurate assessment indicated that this technique is feasible and effective,furthermore,accuracy can reach 93.7%.That is,the method has important academic and practical significance,especial for the water information of net river region,where the river web is more complicated and human interference is intense.
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