Can the ML be applied to an NDWI image? Or is it a separate means of classifying that is only applied on 2 or more bands? The problem I am actually facing is that without knowing that this could be a problem, I have already applied the NDWI and then the MLC on it. My question is now, how exactly does this change my results?
closed as unclear what you're asking by Mapperz♦ Nov 21 '16 at 16:36
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You can apply a Maxiumum Likelihood classification to a single band image. However, the results will not be very useful and could be achieved just as easily by simply reclassifying the single band into two or more classes based on the pixel value.
If you want to get a good classification from a single band, you have to look at spatial information, rather than pixel by pixel. As such, consider image segmentation as a step before the classification.