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Exposure estimation from multi-resolution optical satellite imagery for seismic risk assessment / Marc Wieland in ISPRS International journal of geo-information, vol 1 n°1 (March 2012)  

Public [article]  inISPRS International journal of geo-information > vol 1 n°1 (March 2012) . - pp 69 - 88 Titre : Exposure estimation from multi-resolution optical satellite imagery for seismic risk assessment Type de document : Article/Communication Auteurs : Marc Wieland, Auteur ; Massimiliano Pittore, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 69 - 88 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] aléa [Termes IGN] image Landsat [Termes IGN] image optique [Termes IGN] image Quickbird [Termes IGN] Kirghizistan [Termes IGN] risque naturel [Termes IGN] séisme [Termes IGN] vulnérabilité Résumé : (auteur) Given high urbanization rates and increasing spatio-temporal variability in many present-day cities, exposure information is often out-of-date, highly aggregated or spatially fragmented, increasing the uncertainties associated with seismic risk assessments. This work therefore aims at using space-based technologies to estimate, complement and extend exposure data at multiple scales, over large areas and at a comparatively low cost for the case of the city of Bishkek, Kyrgyzstan. At a neighborhood scale, an analysis of urban structures using medium-resolution optical satellite images is performed. Applying image classification and change-detection analysis to a time-series of Landsat images, the urban environment can be delineated into areas of relatively homogeneous urban structure types, which can provide a first estimate of an exposed building stock (e.g., approximate age of structures, composition and distribution of predominant building types). At a building-by-building scale, a more detailed analysis of the exposed building stock is carried out using a high-resolution Quickbird image. Furthermore, the multi-resolution datasets are combined with census data to disaggregate population statistics. The tools used within this study are being developed on a free- and open-source basis and aim at being transparent, usable and transferable. Numéro de notice : A2012-702 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi1010069 En ligne : https://doi.org/10.3390/ijgi1010069 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77888 [article]