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Land-cover changes occur naturally in a progressive and gradual way, but they may happen rapidly and abruptly sometimes. Veryhigh resolution remote sensed data acquired at different time intervals can help in analyzing the rate of changes and the causalfactors. In this paper, we present an approach for detecting changes related to disasters such as an earthquake and for mapping of theimpact zones. The approach is based on the pieces of information coming from SAR (Synthetic Aperture Radar) and on theircombination. The case study is the 22 February 2011 Christchurch earthquake.  The identification of damaged or destroyed buildings using SAR data is a challenging task. The approach proposed here consists infinding amplitude changes as well as coherence changes before and after the earthquake and then combining these changes in orderto obtain richer and more robust information on the origin of various types of changes possibly induced by an earthquake. Thisapproach does not need any specific knowledge source about the terrain, but if such sources are present, they can be easily integratedin the method as more specific descriptions of the possible classes.  A special task in our approach is to develop a scheme that translates the obtained combinations of changes into ground information.Several algorithms are developed and validated using optical remote sensing images of the city two days after the earthquake, as wellas our own ground-truth data. The obtained validation results show that the proposed approach is promising

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

An approach for detecting changes related to natural disasters using Synthetic Aperture Radar data