Boulder study by handheld laser scanner

Abstract

In this project, the application of handheld laser scanner in boulder characterization is studied. ZEB Revo, a light and portable rotating laser scanner, is used to obtain the scanning data. It has the advantages of high precision, real-time data visualization and fast speed. Firstly, in laboratory scanning stage, the optimal scanning condition, including scanning time, scanning height, and scanning speed is tested using 3 artificial objects. Based on these findings, the optimal scanning distance is tested using 18 artificial objects of different dimensions. Then the field scanning of 3 anchor ends is conducted, and the results are assessed. In this study, 3ds Max and CloudCompare are used in the accuracy evaluation of each scan. In 3ds Max, the objects are modeled before scanning, and the mesh data is exported. In CloudCompare, scan data and mesh data are imported, and the two data are aligned. The distribution of distance between point cloud data and the surface of the mesh data is calculated. The mean value and standard deviation of the distance distribution are the basis for evaluating the scanning accuracy. Through this study, the optimal point cloud density, scanning height, scanning speed and scanning distance are obtained. The possibility of applying 3ds Max modeling to scan accuracy evaluation is tested. This method has the potential to be used and developed in other related research in the future.