Application Of 3D Laser Scanning Technology In Landslide Monitoring

China is a country with frequent natural disasters,and almost all kinds of natural disasters on the earth have occurred in our country,among which geological disasters have brought more serious damage to our country.The main geological disasters in China are landslide,earthquake,debris flow and so on.Landslide also accounts for a large proportion of natural disasters in China,which brings huge losses to our country's social economy and people's property.We need to deal with landslide disaster correctly and timely,and it is an effective means to prevent and control landslide by using surveying technology to monitor landslide.Three-dimensional laser scanning technology has been paid attention to by people because of its new,fast and contactless measurement method.For the traditional monitoring means,it provides a method for geological hazard monitoring.The main principle of 3D laser scanning technology is introduced.The accuracy(ranging,angle measuring,point position)analysis of 3D laser scanner is analyzed by combining the experimental calibration field with high precision total station and longitude and weft measurement system.The feasibility of three-dimensional laser scanning technique for monitoring landslide is expounded.Combined with practical engineering examples,the stability of landslide is calculated,the stability coefficient K is obtained,and the trend of slope movement is evaluated qualitatively and quantitatively.The TrimbleTX8 scanner is used to observe the slope body,and the Realworks data processing software is used to deal with it.The detailed operation flow is given,including the selection and layout of the control points.The acquisition of field data,the processing of internal data,etc.,by scanning the moving area of slope,obtaining point cloud data,extracting point cloud data of monitoring point T1 and T2,calculating the coordinates,calculating the change amount,and using MATLAB to map,Get the change trend of the monitoring point.The target point cloud is cut from the entire scene of the point cloud and analyzed,the data of the two periods are superimposed together for comparison,and the point cloud is cut in the office measurement mode.The 3D detection map is generated to analyze the whole and local changes of slope body.Through the combination of point and surface,it is concluded that the mountain body has the possibility of sliding again,which is the edge.The treatment of unstable slope area provides the basis.