Rapid extraction of Pakistan floods from TM images

This paper take the catastrophic floods of Pakistan in August 2010 as research object, based on the spectral characteristic of the water body. This paper takes the water extraction experiment on TM images which contain a large number of confounding factors. We compared and analyzed the results obtained by the methods such as Single-band threshold value method, Spectral Relations Act and Normalized water index etc. The results show that MNDWI is the best method about extracting the flood information from TM images. This paper provides the methodological guidance for water extraction in remote sensing images.