Landslide Deformation Monitoring Based On 3D Laser Scanning

Landslide is a common geological disaster in daily life.The occurrence of landslide often leads to great loss of life and property.Effective monitoring of landslides ahead of time,and countermeasures should be taken to prevent and reduce losses caused by landslides.3 d laser scanning technology can obtain actively,non-contact three-dimensional point cloud data.Compared with the conventional measurement of single point information on the main part of the landslide surface,3d laser scanning can obtain a lot of data with high real precision on the landslide surface.The point cloud data provides a favorable guarantee for the accurate analysis of landslide deformation,and has a great advantage in landslide monitoring.In this paper,the three dimensional laser scanning technology is applied to the monitoring of landslide deformation.1.The key technologies of 3d laser scanner system are introduced.This paper mainly introduces the principle of laser ranging,scanning angle principle,scanner scanning principle and 3d coordinate acquisition principle.The accuracy and the advantages and disadvantages of different splicing methods are verified,and the application scope of each method is analyzed.The establishment of point cloud splicing,point cloud filtering and model in point cloud data processing is studied.2.In view of the bad effect of voxel growth in filtering landslide vegetation,based on the spatial distribution characteristics of point cloud,the coordinate transformation of point cloud data is carried out,and an improved voxel growth method is proposed.Experimental results show that the improved voxel growth algorithm of vegetation on the flat area and landslides filter has good effect.After filtering the vegetation,the type I error is far greater than the class II error.3.In view of the characteristics that the analysis results of landslide deformation cannot have both intuitionistic and quantitative analysis at the same time,a statistical analysis method is put forward to calculate the deformation of the two point cloud in in three-dimensional coordinate direction,and the Gauss curve fitting is used to analyze the statistical data,and the deviation in the direction of three coordinates is obtained.Experiments show that compared with the traditional analytical expression results,the method of chromatographic statistical analysis and deformation can more directly and quantitatively analyze the deformation of point cloud on landslides.4.The research analyzed the ground three-dimensional laser scanner in the practical application of landslide deformation monitoring,using periods scanning data,the integrated use of the method of point,line and plane of landslide deformation were analyzed,and the intuitive three-dimensional rendering of landslide deformation condition,for the 3 d laser scanning in the landslide deformation monitoring data processing provides a train of thought.5.In view of the characteristics that it is difficult to obtain the data of the top of the landslide under the terrain conditions of steep mountain slope,the combination of UAV aerial survey and 3d laser scanning are applied to the landslide monitoring.The landslide data collected by unmanned aerial vehicle aerial survey and ground three-dimensional laser scanner are registered.The experiment shows that the combination of UAV aerial survey technology and 3D laser scanning technology can improve the accuracy of unmanned aerial vehicle aerial survey data so as to be better applied to the unfavorable mountain steep slope area with data collection.