REMOTE SENSING AND GIS CONTRIBUTION TO NATURAL HAZARD RISK SITE DETECTION - DEMONSTRATED BY EXAMPLES FROM N-VENEZUELA, CENTRAL ITALY AND SW-GERMANY/NW-SWITZERLAND

摘要

In the fields of awareness, preparedness and mitigation of natural hazards a multidisciplinary integration of different methods and data has the greatest potential for substantial progress. In the scope of this study the use of remote sensing and Geographic Information Systems (GIS) is examined as contribution to a multi-risk database in N-Venezuela, Central Italy and SW-Germany/NW-Switzerland. Satellite imageries and digital elevation data form the basic data stock, combined with other geodata. Digital image processing methods are used to enhance satellite data in order to contribute to the investigation of environmental conditions and of natural hazards. LANDSAT ETM imageries merged with digitally processed digital elevation data clearly indicate areas that might be prone by flooding in case of extreme weather events, or are susceptible to landslides or soil erosion. Subsurface structures (as fault and fracture zones) and local site conditions of potential influence on earthquake damage intensity can be partly derived by geomorphmetric analysis methods and the identification of linear tonal anomalies on the imageries.