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Problem with "Image thresholding technique" (mask and extract)

Question asked by on Dec 17, 2014
Latest reply on May 5, 2015 by hlzhang525

Hello Guys,

                 I have to extract water body from Landsat imagery, I used the NDWI to extract water area from imagery, but i want to use image thresholding technique to define my own mask and extract only water area in the image. What techniques are possible ? Is level slicing good enough or not ?