Nowadays, Remote sensing is widely applied into flood monitoring. In order to obtain the accurate flooded area, water
body need be well segmented, however, image segmentation is still a hard problem. In fact, each image segmentation
method has its advantages and disadvantages, single method is hard to acquire satisfactory results, so two or more
methods combination are applied. In this paper, the algorithm of combination watershed transformation and region
merging based on morphologic gradient is introduced and applied in a typical flooded region, Quyuan town of Hunan
province of China to extract the area of target water bodies, at the same time, other segmentation methods: ISODATA
and the combination segmentation methods of optimal threshold and mathematical morphology, are also applied. Finally,
compared with actually measurement area of the target water body by Differential GPS, some suggestive conclusions are
drawn.
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