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：2004
卷号：XXXV Part B3
页码：281-284
出版社：Copernicus Publications
摘要：A combination of airborne and terrestrial LIDAR data has been used to model extremely steep mountains that are crossed by the Núria cog railway. This cog train is the only terrestrial transportation resort to reach the Núria Valley in the Spanish Pyrenees. The purpose of this Digital Elevations Model (DEM) is the modeling of rocks that fall over the railway track in order to implement protection measures to mitigate this risk. The airborne LIDAR system was an Optech ALTM 3025. Special parameter settings were selected to improve the coverage of the area but as the mountains contain many overhangs and vertical walls some occlusions appeared in the airborne LIDAR data. A terrestrial survey was also carried out in order to improve the terrain modeling. The terrestrial campaign consisted of 5 scenes observed with a Riegl LMS-Z210 mounted on a tripod in 5 static positions in front of the problematic vertical areas. Terrestrial laser scenes were oriented identifying previously surveyed reflectors. The poster presents the methodology applied to integrate data from both LIDAR sensors and shows the obtained results
