Geological Survey and Risk Assessment Based on UAV Photogrammetry
Geological surveying prior to site selection is a crucial component to ensure the smooth implementation of large-scale in-frastructure projects.To explore cost-effective and practical geological surveying techniques,a mining area in South Central China was taken as an example and unmanned aerial vehicles(UAVs)equipped with high-resolution cameras and with high-density grid imaging mode were utilized to capture images and achieve 3D reconstruction of the study area.After generating a digital elevation model from the point cloud model,relevant geological information was extracted to conduct preliminary assessment of potential geological risks.The re-sults indicate that UAV-based aerial survey significantly improves the efficiency of geological surveying compared to manual techniques,providing a clear and accurate representation of the actual conditions in the test area.The high-density grid imaging mode proves to be convenient for this kind of missions,and the integrated analysis of 3 D models,point cloud models,and DEM(digital elevation models)exhibits a strong correlation with reality.The findings of this study offer novel insights for geological reconnaissance practices.
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