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：1998
卷号：XXXII Part 4
出版社：Copernicus Publications
摘要：During the last years laserscanning has been accepted as a technique to generate digital elevation models (DEMs).Generally laserscanner systems consist of a multi-sensor package integrated into an airborne platform for the surveyflight. The TopoSys laserscanner system is designed to produce digital elevation models (DEMs) of the environment at amaximum accuracy of 0.5 m in x and y and 0.1 m in z. The exceptional measurement frequency of 80000 measurementsper second result in about four measurements per m² on ground. This measurement density and the regular scan pattern(parallel lines) form the basis for high quality DEMs.The throughout digital data recording as well as the mainly automated data processing allows to generate DEMs oflarge areas at a short production time. The basic output of the production line is a raster DSM (Digital Surface Model) ata grid width of 1 m which still includes vegetation and buildings. Vegetation, buildings etc. may be eliminated by meansof a semi-automated process in order to derive the classical DTM (Digital Terrain Model). During the last two years theaccuracy of TopoSys DEMs has been proven in several applications.TopoSys DEMs meet the stringent requirements which are common in such applications as water resourcesmanagement, shoreline monitoring, planning of utility lines and urban planning. The performance of the system isillustrated with help of DEM sections produced with the TopoSys system
