Abstract: Traditional geohazards emergency investigation is limited by the complex terrain, weather and other external conditions cannot obtain the detailed information of the hazards quickly and comprehensively, while UAV has the characteristics of strong flexibility, high timeliness and not affected by complex terrain, which has unique advantages in geohazards emergency investigation. Taking “6·24” Xinmocun landslide and “10·11” Baige landslide damming events as an example, this paper expounds the unmanned aerial vehicle (UAV) geohazards emergency investigation data acquisition and processing, mainly introduces the UAV three-dimensional digital terrain products in accurate description of geohazards, the application of the qualitative and quantitative analysis. Results show that the UAV photogrammetry technology provides a more scientific and efficient field image acquisition and remote sensing processing application solutions. It provides a technical and data support for the development of emergency rescue work smoothly and efficiently, and a scientific and effective way to guarantee the safety of site construction crews.

Key words: UAV photogrammetry technology, catastrophic geohazards, emergency investigation, Xinmocun landslide, Baige landslide