A backpack type three-dimensional laser point cloud data-based building contour line extraction method

Abstract

The invention provides a building contour line automatic extraction method based on backpack type three-dimensional laser point cloud data. The method specifically comprises the following steps that 1, realizing point cloud data slicing, point cloud data denoising, local straight line fitting, linear data classification, overall straight line fitting, overall contour line configuration, local datafeature point searching and overall contour line and local feature point fusing. According to the method, a backpack three-dimensional laser scanning system is adopted, so that data can be acquired at a place where people can pass through the backpack three-dimensional laser scanning system, the operation mode is more flexible, the acquired data are more complete, the working efficiency is higher, and the cost is lower; point cloud data is subjected to neighborhood searching, a principal component analysis method and a fuzzy C-means algorithm point by point through a kd tree, and high-precision automatic extraction of the building contour is achieved; accurately fitting the slope of a local straight line by using the unit feature vector; and accurate classification of straight line data with different slopes can be realized through clustering based on the included angle data of the fitting straight line and the X axis.

Description

technical field [0001] The invention relates to the technical field of geographic information, in particular to a building outline extraction method based on backpack-type three-dimensional laser point cloud data. Background technique [0002] With the gradual deepening of concepts such as "digital city", urban spatial information has become an indispensable and important resource in today's society. As the most important part of the city, buildings and their outlines are realized based on remote sensing data. High-precision and fast extraction will provide important basic data for "digital cities", and it is also one of the difficulties in the current research field. [0003] The methods used in surveying and mapping industry to measure the outline of buildings mainly include traverse survey, triangulation, etc. During the measurement process, it is necessary to lay out control points and measure the feature points of the outline point by point, and then use drawing softwar...

AI Technical Summary

Problems solved by technology

[0005] In order to improve the problem of low work efficiency and automation in the process of measuring building outlines by means of wire surveying and triangulation in the existing surveying and mapping industry, the present invention proposes a method based on point cloud data of a backpack-type 3D laser scanning system to realize building outlines. The high-precision automatic extraction method of lines adopts the following technical solutions:

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