Side slope DEM generation method based on ground three-dimensional laser point cloud

A 3D laser and point cloud technology, applied in 3D modeling, geographic information database, image enhancement, etc., can solve the problem of losing important features of slope topography, and achieve the effect of great theoretical reference value

Active Publication Date: 2020-06-23
JIANGXI UNIV OF SCI & TECH
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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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  • Side slope DEM generation method based on ground three-dimensional laser point cloud
  • Side slope DEM generation method based on ground three-dimensional laser point cloud
  • Side slope DEM generation method based on ground three-dimensional laser point cloud

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Embodiment Construction

[0023] With reference to the accompanying drawings, the specific implementation method of the present invention will be described by taking the construction of a slope three-dimensional laser point cloud data grid DEM as an example in conjunction with the accompanying drawings:

[0024] 1. Obtain the slope point cloud through the ground 3D laser scanning system, and perform data preprocessing on it to obtain the original point cloud to be repaired.

[0025] A Riegl VZ-1000 3D laser scanner is used to collect data on a certain slope, and the 3D laser point cloud data of the slope is obtained. The scanning mode is set to Panorama_20, so as to obtain denser laser point cloud data. After data collection in the field, RiSCAN PRO software is used in the office to perform preprocessing operations such as denoising, configuration, and filtering on the obtained 3D laser point cloud data. For obvious occlusion points and non-slope noise points such as buildings, trees, cars, pedestrians...

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Abstract

The invention discloses a side slope DEM generation method based on ground three-dimensional laser point cloud. The method includes: acquiring three-dimensional laser point cloud data reflecting the global features of the slope surface by using a three-dimensional laser scanning system, and performing planar projection interpolation on the three-dimensional laser point cloud of the slope surface based on a moving least square principle to obtain an interpolation reconstruction three-dimensional point cloud of the slope; then calculating the adjacent average distance of the three-dimensional point cloud K, identifying the hole repairing point cloud from the interpolation reconstruction three-dimensional point cloud, and fusing the hole repairing point cloud into the original three-dimensional laser point cloud, thereby realizing the hole self-adaptive repairing of the three-dimensional laser point cloud; and finally, fitting a projection plane by utilizing an MLS principle, carrying outpoint cloud normal vector calculation, constructing a DEM triangulation network model by adopting a Delaunay criterion, and organizing and managing triangular patches by adopting a half-edge data structure. According to the method, the discrete point cloud data can be utilized to construct the slope DEM, and rich terrain information is provided for the aspects of digital disaster reduction, resource exploitation, safety production and the like.

Description

technical field [0001] The invention relates to the field of three-dimensional laser point cloud data processing, in particular to a method for efficiently generating slope DEM based on ground three-dimensional laser point cloud. Background technique [0002] As a common geological disaster, landslides have a strong destructive force that poses a huge threat to the ecological environment and people's life and property safety. 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 kind of local point monitoring, which has the disadvantages of few sampling points and it is difficult to reflect the global characteristics of deformation. The monitoring method based on 3D laser scanning technology can obtain 3D laser point cloud data reflecting the global characteristics of the slope surface, and use the discrete point cloud da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/05G06T5/00G06T3/40G06K9/62G06F16/29
CPCG06T5/002G06T17/05G06T3/4023G06F16/29G06T2207/10028G06F18/24143
Inventor 王永志廖丽霞李辉王宝娟胡晓宇
Owner JIANGXI UNIV OF SCI & TECH
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