Application Of UAV Tilt Photogrammetry Technology In Geological Hazard Monitoring

China is a country prone to geological hazard,and because of China's geology,climate and other characteristics,the types of geological hazard in China are diverse.Every year,geological disasters pose a great threat to the safety of people's lives and property.The traditional monitoring methods of geological hazard are time-consuming and labor-intensive,and need to consume huge human and material resources.Because of the terrain characteristics of our country,geological hazard often occur in mountainous areas.It is difficult to comprehensively monitor by using the traditional monitoring technology,and the use of UAV tilt photogrammetry technology can avoid this deficiency.Since the birth of UAV tilt photo grammetry technology,because of its high timeliness and high cost performance,it has been applied to geological hazard monitoring,power,rescue and smart city,etc.with the continuous efforts of researchers from all walks of life,it has enriched the diversity and macro-scale of the survey results,and has an indispensable role The role of the promotion.Especially in the field of geological disaster monitoring is widely used.This research is also on the shoulders of predecessors,relying on the actual engineering,and introduces the UAV tilt photogrammetry technology in geological hazard investigation,and makes a simple study on its application in the field of ground hazard monitoring.The main work of this study is as follows:Firstly,the background,significance and research status of UAV tilt photogrammetry technology are introduced.The principle of UAV tilt photogrammetry technology is introduced.The software context capture used in this study is also briefly introduced,In addition,to deal with the errors of 3D model results due to aerial photographing and modeling complexity when the system studies geological hazard,a small figure is selected to study the establishment and verification of the whole system to ensure the availability,feasibility and accuracy of the system,so as to save human and material resources and financial resources,It will lay a solid foundation for the next system to study debris flow againSecondly,3D modeling of debris flow in a small area of Qilian County in Gansu Province is carried out,and the 3D model,DOM(orthophoto)and DSM(digital surface model)information of the hazard area are obtained by processing the photographic image data of the hazard area with UAV tilt photogrammetry technology.According to the three-dimensional model,the debris flow gully is judged and interpreted,and its length,the altitude of the highest point and the lowest point are defined.The difference analysis of DSM information is carried out by using Arc GIS software,and the difference results are obtained and analyzed.The change characteristics of debris flow are analyzed and summarized,and the development trend of debris flow is predicted.It is a novel method to monitor the geological hazard area.Finally,with the rapid development of UAV tilt photogrammetry technology,it is very common to apply it to geological disaster monitoring.However,the traditional analysis data are based on two-dimensional plane measurement and analysis,which can not be intuitively felt,so the visualization research of three-dimensional model becomes more urgent,In this paper,based on cesium development system,3D visualization of 3D model obtained by oblique photography is developed,which makes the project report more intuitive.The system can measure the length,area,volume and other functions,and also can roam the path,play video and other functions.It is convenient for researchers to share the results with others.