ISPRS-Archives The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ISPRS-Archives Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci. 2194-9034 Copernicus Publications Göttingen, Germany 10.5194/isprsarchives-XL-7-161-2014 Flood Mapping Using InSAR Coherence Map Selmi S. 1 Ben Abdallah W. 1 Abdelfatteh R. 1 2 COSIM Lab, University of Carthage, Higher School Of Communications of Tunis Route de Raoued KM 3.5, Cite El Ghazala Ariana 2083, Tunisia Département ITI, Télécom Bretagne, Institut de Télécom Technopôle Brest-Iroise CS 83818 29238 Brest CEDEX 3, France 19 09 2014 XL-7 161 164 Copyright: © 2014 S. Selmi et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://isprs-archives.copernicus.org/articles/XL-7/161/2014/isprs-archives-XL-7-161-2014.html The full text article is available as a PDF file from https://isprs-archives.copernicus.org/articles/XL-7/161/2014/isprs-archives-XL-7-161-2014.pdf

Classic approaches for the detection of flooded areas are based on a static analysis of optical images and/or SAR data during and after the event. In this paper, we aim to extract the flooded zones by using the SAR image coupled with the InSAR coherence. A new formulation of the ratio approach for flood detection is given considering InSAR coherence. Our contribution is to take advantage from the coherence map provided using the InSAR pairs (one before and one after the event) to enhance the detection of flooded areas. We explore the fact that the coherence values during and after the flood are mainly differents on the flooded zones and we give a more suitable flood decision rule using this assumption. The proposed approach is tested and validated in the case of the flood taken place in 2005 in the region of Kef in Tunisia.