Progressive building extraction method based on original laser point cloud

A laser point cloud and extraction method technology, applied in the field of geographic information, can solve the problems of low efficiency of building outline extraction methods, achieve good results and improve efficiency

Active Publication Date: 2020-06-30
POWER CHINA KUNMING ENG CORP LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a progressive building extraction method based on the...

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  • Progressive building extraction method based on original laser point cloud
  • Progressive building extraction method based on original laser point cloud
  • Progressive building extraction method based on original laser point cloud

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[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0043] In this example, the built-up area in Jianshui County, Yunnan Province will be taken as the research object. The UAV-mounted LiDAR point cloud acquisition M600Pro+Rigel scanning system will collect data in this area to obtain the original point cloud data of the surface of the target area. The invention provides a method for extracting buildings based on oblique photography and laser point clouds, comprising the following steps:

[0044] Step 1, using progressive mathematical morphology filtering on the original laser point cloud to separate non-ground points;

[0045] Step 2, use the impro...

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Abstract

The invention discloses a progressive building extraction method based on an original laser point cloud, and the method comprises the following steps: 1, carrying out the progressive mathematical morphological filtering of the original laser point cloud, and separating non-ground points; 2, adopting an improved 3D-Hough conversion algorithm to detect a plane in non-ground points, extracting building point cloud through the plane, and projecting the building point cloud to a two-dimensional plane; 3, determining key points of the building point cloud by adopting an adjacent point azimuth anglethreshold method; 4, based on the key points of the building point cloud, utilizing RANSAC fitting to obtain an initial contour line of the building; and 5, regularizing the initial contour line of the building by using a regularization algorithm to obtain a regularized building contour line. According to the method, a complete set of extraction process from the original point cloud to the building contour line is provided, processing can be directly started from the obtained laser radar point cloud data, and the type, range and precision of the extracted point cloud can be adjusted accordingto requirements.

Description

technical field [0001] The invention relates to the technical field of geographic information, in particular to a progressive building extraction method based on original laser point clouds. Background technique [0002] Buildings as the main body of the city are important elements of urban 3D modeling, and the extraction of building outlines is a key step in 3D modeling. Building outline information is used to supervise illegal buildings, update maps, evaluate real estate, The construction of smart cities is also of great significance. At present, for the extraction and regularization of building outlines, there are mainly methods based on high-resolution remote sensing images, airborne LiDAR data and a combination of the two. Traditional image-based building outline extraction is often interfered by various ground objects, which is technically difficult and inefficient. Therefore, many scholars use the method of combining high-resolution images and lidar point cloud data...

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Application Information

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IPC IPC(8): G06T17/05G06T3/00G06K9/62
CPCG06T3/0031G06T17/05G06T2207/20061G06T2207/10028G06V10/757
Inventor 王冲赵飞吴小东闻平王莹栾有昆吴弦骏谢飞廖丽敏付航
Owner POWER CHINA KUNMING ENG CORP LTD
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