Airborne laser radar data-based building three-dimensional reconstruction method

Abstract

The invention discloses an airborne laser radar data-based building three-dimensional reconstruction method and aims to propose a three-dimension reconstruction method combining a building roof boundary with a roof topologic graph so as to realize automatic detection and three-dimensional reconstruction of a building. The method comprises the steps of firstly, filtering airborne LiDAR (Airborne Light Detection And Ranging) data to obtain a ground point and a non ground point; secondly, extracting building point cloud from non ground point cloud in combination with point cloud characteristic information; thirdly, segmenting a roof surface and extracting a boundary contour line; and finally, obtaining key line segments of a roof in combination with the building boundary and the roof topologic graph, and constructing closed polygons of each root surface and combination of the closed polygons so as to obtain a building roof model. The wall surface can be obtained by elevation information of DTM or the ground point, so that the building 3D (three-dimensional) model reconstruction is realized. According to the method, the application bottleneck of the airborne LiDAR data at the present stage is broken through to a certain extent, the complexity of a reconstruction process is lowered, the flexibility of 3D reconstruction is improved, and a breakthrough is provided for city 3D reconstruction.

Description

Technical field [0001] The patent of the present invention belongs to a digital photogrammetry technology, which involves extracting building point clouds from airborne laser radar data and reconstructing the three-dimensional model of the building. This method is a method with application value. The digital model of the building is An important part of digital city construction. Background technique [0002] With the rapid development of cities, many cities have successively launched "digital city construction" development strategies suitable for their own development, in which the three-dimensional digital reconstruction of buildings is an important content. 3D building models are a very important component in digital cities, as well as in other applications such as geographic information systems, urban planning, disaster management, emergency response, and virtual / augmented reality. Airborne LiDAR (Airborne Light Detection And Ranging) technology can directly and quickly...

AI Technical Summary

Problems solved by technology

However, it is still difficult to reconstruct buildings with complex structures or incomplete LiDAR data, which has always been a research hotspot.

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