A method for generating slope dem based on ground 3D laser point cloud

Abstract

The invention discloses a method for generating a slope DEM based on a three-dimensional laser point cloud on the ground. The three-dimensional laser point cloud data reflecting the global characteristics of the slope surface was obtained by using the three-dimensional laser scanning system, and the three-dimensional laser point cloud of the slope ground was projected and interpolated based on the principle of moving least squares to obtain the interpolation and reconstruction of the three-dimensional point cloud of the slope. The 3D point cloud K is adjacent to the average distance, identify the hole repair point cloud from the interpolation and reconstructed 3D point cloud, and fuse the hole repair point cloud into the original 3D laser point cloud, so as to realize the hole adaptive repair of the 3D laser point cloud; Finally, the MLS principle is used to fit the projection plane, and the normal vector of the point cloud is calculated. The DEM triangulation model is constructed using the Delaunay criterion, and the half-edge data structure is used to organize and manage the triangular facets. The invention can use discrete point cloud data to construct a slope DEM, and provide abundant terrain information for digital disaster reduction, resource mining, safe production and the like.

Description

Technical field [0001] The invention involves the field of three -dimensional laser point cloud data processing, which specifically involves a high -efficiency method of DEM -based slope DEM on the ground three -dimensional laser point cloud. Background technique [0002] As a common geological disaster, landslides have brought huge threats to the ecological environment and people's life and property security. The dynamic monitoring and analysis of landslides has become a key issue for public institutions at home and abroad to support disaster response. The traditional slope deformation monitoring method is mainly a local point monitoring. There are shortcomings such as the global characteristics of deformed global features with less sampling points. Based on the monitoring method of three -dimensional laser scanning technology, you can obtain 3D laser dot cloud data reflecting the global characteristics of the slope surface, and use discretely dot cloud data to build a landslide...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to overcome the influence of noise and the loss of important features of slope topography in the process of repairing holes in the 3D laser point cloud on the slope surface, provide a slope DEM generation method based on the 3D laser point cloud on the ground

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