Application Resarch On Ground-based LIDAR In Spatial Anysis Of Landslide

LIDAR (Light Detection And Ranging) is a new type of Surveying and mapping technology which integrates a variety of high and new technologies, high-speed non-contact laser measurement, in "measure the surface" point cloud forms to obtain information of three-dimensional surface of the target, also known as Terrestrial laser scanning technology. It has the characteristics of high precision, high resolution, high speed and high automation. In recent years, terrestrial LIDAR has begun widely used in the field of heritage conservation, ancient architecture reconstruction, digital city, topographic surveying,urban planning and landslide stability monitoring etc.Based on the analysis of the characteristics and application of terrestrial LIDAR technology, a number of issues that the ground LIDAR used in spatial analysis of slope were systematically studied. The main contents and results include the following aspects:(1) According to the characteristics of the laser point cloud data, several important issues of point cloud data preprocessing are researched. Firstly, the normal distribution transform (NDT) registration method is studied, and the NDT registration method has been improved. Based on the consistency of the initial sampling transformation normal registration Registration is put forward, which can be used in terrestrial laser scanning technology; Secondly, the point cloud filtering method based on statistical analysis is studied, checking results show that the method can effectively filter out outliers; Third, the point cloud reduction method based on voxel grid is researched, which can effectively reduce the point cloud, and can keep the details of the target well at the same time reduce the cloud point.(2) Combined with laser scanning principle, Ground LIDAR acquisition slope point cloud data process and considerations needing attention are discussed; The identification method of rock mass structure surface and structural plane occurrence calculation method based on point cloud data are studied; The slope rock mass structure of face spatial distribution was analyzed. Advantages of the surface structure and distribution of rock mass are statistically.(3) To explore the point cloud optimization of the storage structure and the point cloud normal consistency of approach. And the iterative moving least square implicit surface reconstruction method and the evaluation method of surface reconstruction based on Hausdorff distance are studied.(4) A new geometric analysis method based on point cloud deformation was proposed, which can be comprehensive, intuitive, qualitative and quantitative analysis of the deformation of the slope.Theoretical analysis and case checking results show that the proposed method can be applied to spatial analysis of slope and can obtain satisfactory results.