RESEARCH AND APPLICATION OF TECHNOLOGY FOR RAPID CONSTRUCTION OF HIGH-PRECISION SURFACE THREE-DIMENSIONAL MODEL OF GEOLOGIC HAZARD BASED ON CLOUD COMPUTING

China has a fragile geological environment and experiences frequent geologic hazards. The total area of geologic-hazard-prone (i.e., collapse, landslide, and mudslide) regions accounts for approximately 65% of China’s land area. By the end of 2018, more than 280,000 geologic hazards were identified. Traditional methods of using field survey tools such as compasses, geological hammers, and cameras to carry out field data collection have been unable to meet the needs of refined surveys. With the development of technologies such as cloud computing, unmanned aerial vehicles (UAVs), and oblique photography modeling, it is possible to realize the rapid construction of high-precision surface three-dimensional (3D) models of geologic hazards using micro-UAVs and cloud computing technologies, two aspect of which are the focus of this paper: construction of the Geologic Hazard 3D Modeling Cloud Platform, and its application in many geologic hazard field surveys in the past three years. First, the cloud platform based on the Wen front end, the route control system of the mobile terminal, and construction of the application system on the PC end is interpreted. Second, this technology has been applied in the survey of geologic hazards in Hubei, Shandong, Guizhou, and Xinjiang provinces, and has been successfully applied in surveys of many sudden geologic hazards, such as the June 24 Sichuan Maoxian and Oct Jinshajiang Baige landslides. The platform is equipped with a single-lens micro-UAV, which is suitable for 3D modeling of hidden danger points of geologic disasters within an area of 1 km². The plane precision is 5 cm. One investigator can operate and quickly generate high-precision vectorized data such as DOM, DSM, surface 3D models, and panoramas from the collected geologic hazard hidden point image data. In addition, in view of the characteristics of high mountains and steep slopes in geologic hazard areas, a variety of flight modes have been designed, e.g., vertical shooting, and the problems of high cost, low efficiency, and complicated operation of traditional geologic hazard 3D modeling mapping work solved. Our work provides technical support for the large-scale application of UAVs in geologic hazard investigations and significant improvement of the accuracy of survey data.