Establishment And Analysis Of Fine Digital Elevation Model Of Erosion Ditch Based On Point Cloud Data

Surface erosion gullies have severely affected the regional ecological environment and the production and life of local residents,but conventional data and monitoring methods are difficult to meet research needs.In this paper,the southern slopes of Errigou Village,Taipusi Banner,Xilinguole League,Inner Mongolia Autonomous Region,China are used as the research area.Using the advantages of 3D scanning technology,a high-precision digital elevation model is established based on point cloud data.The related research on surface erosion and gullies is carried out.The content and results are as follows:The research contents include:(1)Facing multi-source point cloud data registration,this paper first performs coarse registration,and then performs fine registration.In terms of rough registration,four rough registration methods including PFH feature description operator,FPFH feature description operator,4PCS algorithm,and artificial target ball matching are compared and analyzed.In the point cloud data registration,a more suitable target ball method was selected.Target ball matching can determine the relative position of the two point cloud sets.In the fine registration,the ICP algorithm is used to realize the fine registration of the data.In terms of filtering the merged data,because the point cloud data with two different characteristics are only consistent in spatial morphology,a more suitable cloth simulation filtering CSF algorithm was used to remove the ground data and retain the ground data.(2)In order to collect comprehensive erosion and gully data,a field survey was conducted in the research area,and a data collection scheme was designed.Two scanners with different characteristics were used.The stand-up scanner Riegl VZ-1000 is suitable for collecting large-scale scene information in the research area and fully expresses the topographic characteristics of the area near the surface erosion gully;the handheld scanner ZEB-REVO is suitable for collecting detailed information of the surface erosion gully,which fully displays the erosion gully Each of them has its own strengths and complements each other.(3)The inverse distance weight method is used to interpolate point cloud data to establish a digital elevation model.Based on the established high-precision digital elevation model,terrain factor analysis is carried out from four aspects such as slope and ground variability factors,and erosion is also analyzed.Gully cross section.This paper combines two types of three-dimensional scanners with different characteristics to collect data from the study area,and generates high-precision digital elevation models through interpolation from multi-source point cloud data.The research and monitoring of gullies is of great significance and application value.