Compression method of airborne high-density laser point clouds, storage device and laser radar

Abstract

The invention discloses a compression method of airborne high-density laser point clouds, a storage device and a laser radar. The compression method includes the following steps that: spatial indexes are established for discretely distributed point cloud data by using a preset indexing mode; the spatial distribution features of the point clouds of a specific area are obtained through the related theory of a discrete surface, the local surface features of the laser point clouds are calculated; on the basis of data features required by a specific application, a certain quantity of point clouds containing the data features are extracted and reserved, and the point clouds containing the data features are adopted as global features; compression algorithms which are matched with the requirements of the application are screened out from universally applied discrete data down-sampling algorithms, and the compression algorithms are improved so as to be applied to the compression of dense point cloud data; and the selection and design of the compression algorithms are guided by means of point cloud compression algorithm evaluation. According to the compression method of the airborne high-density laser point clouds, the storage device and the laser radar of the invention, an efficient hierarchical segmentation algorithm is adopted, and a large number of dense point clouds are rapidly compressed through using a strategy of reserving boundary points, and therefore, the fast and efficient compression of high-density three-dimensional laser point cloud data which retains topographic features is realized.

Description

technical field [0001] The invention relates to the technical field of airborne laser point cloud data processing, in particular to an airborne high-density laser point cloud compression method, storage device and laser radar. Background technique [0002] With the development of lidar technology, the density of point cloud data acquired by it is increasing. [0003] Airborne LiDAR (LiDAR) is an active earth observation system that integrates laser ranging technology, computer technology, and inertial measurement unit (IMU) / DGPS differential positioning technology. A major breakthrough has been made in this area, which provides a brand-new technical means for obtaining geospatial information with high temporal and spatial resolution, which has the characteristics of high degree of automation, less affected by weather, short data production cycle, and high precision. However, with the continuous update of hardware acquisition technology, the accuracy of sampling points has b...

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Problems solved by technology

But such a compression method is more complicated

[0006] Due to the high density of the obtained p

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