Experiences in Optical and Sar Imagery Analysis for Damage Assessment in The
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چکیده
The Sichuan Earthquake on the 12th of May 2008, and the extensive rescue operations following this tragic event, proved the value of high-resolution optical and radar remote sensing during the emergency response. Optical data provide a fast and simple way to value “at glance” damages while radar sensors can deliver images independent of weather conditions, day and night, and thus in principle can represent a mean to obtain a damage map in the immediate aftermath of an event, providing precious information for intervention planning. On the other hand, SAR data is far more difficult to interpret than optical data both to the expert and non-expert. Even more so with the advent of new, very-high resolution (VHR) SAR satellites like COSMO/SkyMed and TerraSAR-X; while the features of the former, mid-resolution SAR data provided by satellites like ERS and ENVISAT were quite well known, given the long experience of the scientific community [1], the characteristics of these new data still have to be completely unveiled. It is a standard procedure to identify damaged buildings by change detection: post-event images are compared to preevent archive images and differences taken as a clue of the presence of local damage. On the site of Ying Hsiu Wan (Sichuan) we have found a pair of preand postevent Quickbird images. The first image is dated 26th June 2005 while the post-event one was collected on the 3rd June 2008. Turning to SAR images, unfortunately in the case of Wuhan earthquake there were almost no former VHR SAR images of the area, because the archives are still nearly empty due to the young age of the VHR systems. Building damage assessment using only post-strike SAR images was thus to be considered. In this paper we will present some hypothesis and experiments we have performed, aimed at damage assessment relying only on postevent images..
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تاریخ انتشار 2009