无人机影像在地质灾害调查中的应用

Application of UAV images to geological disaster investigation

汶川地震后,西南地区进入地质灾害高发期。面对高发的地质灾害,如何快速准确地获取地质灾害信息已经成为亟待解决的问题。文中选取映秀镇老虎嘴滑坡所在位置为实验区,采集实验区10km2分辨率0.3m的无人机影像。对获取的无人机影像进行数字摄影测量处理,生成实验区精度0.476m的正射影像,0.731m精度的点云数据以及实景三维模型。在这些数字成果的基础上,对老虎嘴滑坡进行定量分析。此次实验验证无人机在高海拔、高落差的地形环境下作业的可行性,探索定量研究地质灾害的方法。

Southwest China has entered into a high‐incidence period of geological disasters after Wenchuan Earthquake .Under this situation ,it becomes an urgent issue to gain the geological disaster information quickly and precisely .This paper ,taking the Tiger‐mouth landslide in Yingxiu as the case ,collects the UAV images of 10 km2 with a resolution of 0.3 m and generates the orthophoto with 0.476 m accuracy and point cloud data of 0.731 m accuracy . Finally , a real‐scene 3D model is formed after digital photogrammetric processing of the UAV images .Based on these digital products ,a quantitative analysis is carried on . This experiment verifies the feasibility of UAV using in high‐altitude environment with significant elevation difference ,and explores the methods of quantitative research of geological disasters .