机载激光雷达技术在崩塌调查识别中的应用——以奉节县李子崖危岩为例
Application of Airborne Lidar Technology in Collapse Investigation and Identification—A Case Study of Liziya Dangerous Rock in Fengjie County

奉节县位四川盆地和盆边山地过渡地带，地貌以山地为主且地质灾害频发，传统的测量方法难以在此类复杂山区里快速有效地识别山体崩塌区域。本文使用了机载激光雷达技术，机载激光雷达具有的一定程度的穿透性，可穿透一定的云雾和植被，获取到地面信息，通过使用激光雷达采集到的数据，提取出地面点位数据，生成精确的数字高程模型(DEM)。继而通过DEM数据获取相应地形因子，结合对崩塌体的特征分析，实现对于山体崩塌区域的识别。综合实验结果表明，机载激光雷达技术在对复杂山区崩塌区域识别上有较好的效果，可在一定条件下替代传统遥感进入生产。
Fengjie County is located in Sichuan basin and basin edge mountainous transition zone. The landform of Fengjie County is mainly mountainous and geological disasters happen frequently. It is difficult for traditional measurement methods to effectively recognize mountain collapse areas in such complex mountainous areas. In this paper, airborne lidar technology is used. Airborne lidar has a certain degree of penetrability, which can penetrate certain clouds and vegetation to obtain ground information. Ground point position data are extracted from the data collected by lidar, and accurate digital elevation model (DEM) is generated. Then the corresponding terrain factor is obtained through DEM data, and the recognition of mountain collapse area is realized by combining with the feature analysis of collapse body. The comprehensive experimental results show that the airborne laser radar technology has a good effect on the identification of collapse zone in complex mountainous areas and can replace traditional remote sensing to enter into production under certain conditions.