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Oblique aerial photography technology and its application to geological survey:A case study of Wuxia section in the Three Gorges reservoir |
CHEN Jie1,2( ), CAI Jun3, LI Jing1, HE Peng1 |
1. China Aero Geophysical Survey & Remote Sensing Center for Natural Resources,Beijing 100083, China 2. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China 3. Beijing Institute of Surveying and Mapping, Beijing 100038, China |
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Abstract The Wuxia section of the Three Gorges reservoir area is an area where landslides and dangerous rock collapses easily and frequently occur, which seriously endangers the safety of the Yangtze River channel. The oblique aerial photography technology can accurately describe the side texture information of the observed objects and provide basic data for the early identification of hidden dangers of geological hazards. In this paper, based on the elaboration and analysis of oblique aerial photography technology, the authors constructed three-dimensional models based on the acquired oblique aerial images, airborne position and orientation system (POS) data and ground control points, and established a geological hazard risk assessment model based on factors such as geology, geomorphology and hydrology. The development and distribution of new geological disasters in the work area were clarified, the main factors controlling the occurrence of geological disasters in each area were figured out, and the geological disasters susceptibility characteristics and hidden dangers in the area were grasped, thus the application potential of oblique aerial photography technology in geological survey was demonstrated.
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Keywords
oblique aerial photography
Three Gorges reservoir area
landslide
dangerous rock mass
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Issue Date: 18 March 2021
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