hematical Morphology Based Drainage Line Extraction from Remote Sensing Image

A mathematical morphology based drainage line extraction method from remote sensing image is proposed.The coarse drainage line is first extracted with spectral pattern recognition approach,and then is subject to processes such as drainage line connection,noise removal and drainage line thinning using mathematical morphology transformations.A subset of landsat ETM+ image is used to test the presented method.The result shows that this method can effectively extract continuous and smooth drainage lines.Further comparison is made between the extracted drainage lines and that of the digital line graph(DLG) with reference of remote sensing image.It demonstrated that the drainage lines by the proposed method are better agreed with the image than that of DLG.