I want to use a ratio (B3/B2) for the composite lanbdsat foto, which has a band combination 5,4,3, and classify pixel values with threshold >2-3. But I do not know how to insert the right expression.
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I'm having some trouble on how to delineate the glacier area automatically using TM4/TM5 band rations. Guess I need to use raster calculator. But I can't seem to get the coding right. I want to insert a threshold aswell. Any suggestions? Best regards, Marius
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