, like subtracting the “land under water” classes from the general land class and assigning them to flood group, and subtracting the “flood” and “river bed” classes from the water class as subclasses. The classification results in three levels for a zoomed area are given in Consequently, resultant classification is not as general as level 3, and not noisy as level 1 classification. The classification result for the whole image is shown in figure 8.