The Application Of Close-range Photogrammetry In The Monitoring Of Slope Deformation

With the pace of country’s increasing development,many projects have been put on the agenda.Especially the infrastructure construction of our country is mismatching with all-round development.Therefore,in order to develop country better and faster,the infrastructure construction is particularly important.Then,some factors is backsliding with economic development,so environment and national life are under threat.Such as mining,water conservancy,transportation,construction is easy to form the slope,after the wind rain erosion and insecure reinforcement,easy to cause disasters such as landslide,collapse and so on.That may cause large-scale surrounding landslide,such as water conservancy,bridge and so on.The destruction also brought great hidden troubles to the property safety of the surrounding residents.Therefore,it is very important to analyze and forecast the stability of the slope and deformation monitoring through the corresponding technical means.Based on the multi-baseline digital close-range photogrammetry system,this paper makes a three-dimensional modeling of the high-slope deformation of Lianghekou hydropower station by using the close shot photogrammetry,that is,the non-measuring camera Parameter calibration,slope monitoring point accuracy and data processing modeling and so on,then apply the close-range photogrammetry method to the feasibility and effectiveness of slope deformation monitoring.This article mainly studies the following:(1)Explore the method of check the camera.This paper introduces several commonly used calibration methods of camera calibration,and compares the calibration parameters of the Canon EOS 600D camera with 35mm lens based on the Lensphoto method by multi-baseline close-range photogrammetry software.(2)The collection of high slope photo.With the 35mm lens Canon EOS 600D camera on the Lianghekou hydropower station high slope for field operations;(3)The coordinates’ acquisition of monitoring points and check points.Using GPS for the selected evenly distributed but different lines of different slope monitoring points for the standard measurement,to lay foundation of the follow-up coordinates’ modeling accuracy,and the need to check the coordinates of the GPS with the collection;(4)Modeling with multi-baseline close-range photogrammetry software and comparing with the GPS three-dimensional coordinate of the checkpoint to verify and evaluate the modeling accuracy.It proves the feasibility and reliability of multi-baseline close-range photogrammetry software in slope deformation monitoring.Based on the above theory and the study of the Shuangkoukou Hydropower Station’s high slope,this paper draws the following conclusions:In the process of checking the non-measuring camera such as Canon EOS 600D camera,based on the multi-baseline close-range photogrammetry software Lensphoto and the corresponding parameters by MATLAB are in the same order of magnitude,the main distance and the main point of the accuracy of ± 0.01mm to meet the technical requirements;based on Lensphoto,this paper established three-dimensional model coordinates and GPS coordinates measured accuracy,the coordinates’ error as well as the spatial position’s error are controlled in centimeters,but also to achieve the measurement requirements of the project.The research of this paper is the application of close-range photogrammetry in slope deformation monitoring.The combination of theory and practice confirms the reliability and effectiveness of the software system,and it can be applied in the future engineering monitoring.