Threshold-irrelative point cloud filtering method and device for airborne laser radar

An airborne lidar and point cloud technology, applied in radio wave measurement systems, image data processing, 3D modeling, etc., can solve the problem of low processing efficiency, sharp increase in workload, and sharp increase in Lidar point cloud data filtering workload and other issues to achieve the effect of reducing the amount of manual intervention and improving work efficiency

Inactive Publication Date: 2013-02-06
郑州天赐北斗导航技术有限公司
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Problems solved by technology

Using this threshold-related method often has a potential problem: for the Lidar point cloud data filtering process of different terrains, the adjustment of the manual experience threshold setting will lead to a sharp increase in workload
[0006] Judging from the prior art methods for Lidar point cloud data filtering described above, these methods often need

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  • Threshold-irrelative point cloud filtering method and device for airborne laser radar
  • Threshold-irrelative point cloud filtering method and device for airborne laser radar

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[0038] combined with Figure 1~2 , to further describe the present invention:

[0039] The device of the present invention is mainly composed of a control unit, a point cloud data storage, a segmenter, a statistical data generator, and a statistical filter. Among them, the control unit mainly controls the whole automatic point cloud filtering process and the data transmission between each module. The point cloud data storage is mainly used to store the initialization data related to the point cloud data, the intermediate data generated during the filtering process, and the final ground and non-ground point cloud result data. The segmenter mainly implements some initialization and segmentation operations on point cloud data. The statistical data generator mainly completes the generation of some statistical data in statistical filtering. The statistical filter adopts the principle of entropy optimization to realize automatic filtering processing of point cloud data. The ...

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Abstract

The invention relates to the field of digital cartography technology, in particular to a threshold-irrelative point cloud filtering method and device for an airborne laser radar. The technical scheme comprises the following steps: 1) segmenting point cloud data and constructing triangulated irregular network (TIN) of the initial ground; 2) generating point cloud-ground altitude difference data; and 3) conducting filter processing based on the statistics of point cloud-ground altitude difference. The threshold-irrelative point cloud filtering method and device has the beneficial effects that by utilizing the integral statistical characteristics, the method and device is not necessary to adopt thresholds directly related to geometric characteristics of the point cloud data such as the altitude difference and slope to realize airborne Lidar point cloud data filtering process, so that the manual intervention of the whole filtering data processing course is reduced, and the working efficiency of the whole airborne Lidar point cloud data processing is improved.

Description

technical field [0001] The present invention relates to the technical field of digital mapping, in particular to a threshold-independent airborne lidar point cloud filtering method and device, which is suitable for automatic processing of airborne lidar point clouds and separates ground and non-ground point clouds. A statistical filtering method and device. Background technique [0002] In recent years, airborne lidar technology has become an important means to obtain high-precision digital elevation model (DEM). The point cloud data obtained by airborne lidar often includes ground point cloud data and non-ground point cloud data. In order to construct a digital elevation model (DEM), it is usually necessary to separate the ground point cloud data from the non-ground point cloud data in Lidar, that is, to filter the non-ground point cloud data from the original Lidar point cloud data through a filtering method. The Lidar point cloud data filtering method needs to artif...

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Application Information

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IPC IPC(8): G06T17/00G01S7/48
Inventor 曾喆万剑华黄荣刚刘善伟
Owner 郑州天赐北斗导航技术有限公司
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