The Application of Ground Based Lidar for Landslide Topographic Mapping

• Main Authors: Kuo Lang Che, 郭朗哲
• Other Authors: Tian-Yuan Shih
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/c3u279

碩士 === 國立交通大學 === 土木工程系所 === 92 === Ground-based lidar is a modern 3D survey instrument, utilizing the principle of laser ranging to acquire a large amount of 3D points of an object in a very short time. The point clouds integrated from multiple stations can portray the object in details. Thus, it can be further applied to monitor the morphology and deformation of landslides. As compared to traditional survey methods which only offer coordinate information of limited points, ground-based lidar can offer massive three-dimensional information of surface shape. In addition, ground-based lidar has several unique features different from conventional total station type surveying instruments. For example, there are no centering and leveling device in most models of the current lidar systems. A specific design of data organization is required for the alignment of point clouds of multi-stations, geodetic registration and transformation. Two sites were included in this study, namely the Chu-dong river-side landslide and Jeofenerh-san large-scaled dip-slope landslide. A procedure for data processing to obtain a proper dataset for subsequent application was adopted. This includes the acquiring of the multiple scans of point clouds, alignment and merging, and geodetic transformation. Regular DEM is then interpolated from the point clouds for making contour maps and cross-sections of the landslides, and also for registering with digital oblique images of the area to further enhance the understanding of landslides. It is concluded in this study that ground-based lidar is an effective tool for landslide mapping which have the merits of fast generation of detailed 3D topographic information of the landslides. Therefore more supplying information than that of the traditional approaches.