期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2006
卷号：XXXVI Part 1
出版社：Copernicus Publications
摘要：Digital photogrammetric sensor systems that have become available during the last years provide a high potential for generating high-resolution digital elevation models (DEM) and orthoimages for large areas. We report on results from a digital photogrammetric mapping project at Mt. Etna, Italy, applying the airborne HRSC-AX sensor and photogrammetric processing system. The survey parameters have been defined by taking typical requirements of natural hazard areas into consideration, where timely needs for up-to-date topography represent an important operational constraint, in addition to geometric quality. The selected survey parameters allowed us to cover the entire area of Mt. Etna within 3 successive campaign days, while the point accuracy achieved by stereophotogrammetric processing is about 30 cm on average, according to over-determined intersections. Accuracy has been examined with respect to variations of ground sampling distance and terrain type and is found to attain values better than 20 cm in the summit area of Mt. Etna. A DEM at 1 m spatial resolution, as well as orthoimages at 25 cm/pixel have been derived. We conclude that airborne digital photogrammetric surveys that enable the production of high-resolution DEM and orthoimages can be performed effectively under such demanding constraints as are imposed by applications in hazard mitigation, and we discuss the requirements and time-scales associated with timely generation of higher level photogrammetric data products for this purpose
关键词：High Resolution; Aerial Digital Cameras; DEM/DTM; Orthoimages; Hazard Mitigation
