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Classic approaches for the detection of flooded areas are based on a static analysis of optical images and/or SAR data during and afterthe event. In this paper, we aim to extract the flooded zones by using the SAR image coupled with the InSAR coherence. A newformulation of the ratio approach for flood detection is given considering InSAR coherence. Our contribution is to take advantage fromthe coherence map provided using the InSAR pairs (one before and one after the event) to enhance the detection of flooded areas. Weexplore the fact that the coherence values during and after the flood are mainly differents on the flooded zones and we give a moresuitable flood decision rule using this assumption. The proposed approach is tested and validated in the case of the flood taken place in2005 in the region of Kef in Tunisia

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

Flood Mapping Using InSAR Coherence Map