Three-dimensional building information model construction and automatic updating method based on generalized point cloud

Abstract

The invention discloses a three-dimensional building information model construction and automatic updating method based on generalized point cloud, relates to the technical field of building intelligent management, enhances the safety analysis capability of a house management department and the self-control capability of house price evaluation of real estate providers, and provides an effective tool for decision making and participation in a decision making process for governments and residents. According to the specific scheme, the method comprises the following steps: S1, creating a three-dimensional building information model based on semantic segmentation and information enhancement; and S2, automatically updating the three-dimensional building information model. A laser scanning technology and an oblique photography technology are used for researching fusion understanding object semantics of a laser point cloud and an oblique image, firstly, feature extraction is conducted on thelaser point cloud and the oblique image, the incidence relation of the point cloud and the image under geometric and radiation measurement space is established, a feature matching technology under structural relation constraints is used, and alternate energy transmission is realized.

Description

technical field [0001] The invention relates to the technical field of building intelligent management, more specifically, it relates to a method for building and automatically updating a three-dimensional building information model based on generalized point clouds. Background technique [0002] According to the current social background of sustainable development and the status quo of increasing building energy consumption, starting from the whole life cycle management of buildings, two pairs of contradictions are proposed, namely, the contradiction between the current situation of high energy consumption in the construction industry and the main theme of the sustainable development era , and the contradiction that the relatively backward updating means cannot meet the requirements of sustainable development of buildings. One of the typical problems that follow is that the problems of urban construction and management are becoming more and more acute. For example, a large ...

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Problems solved by technology

3D building information model is of great significance in the process of smart city construction, but the defect of only having geometric information limits the application field and application use

[0004] Although oblique photogrammetry can obtain image data with three-dimensional information, texture information, grayscale information and other information, it has the following defects in application: low processing efficiency, data voids caused by the influence of shadows, and local geometric accuracy is low. Low, unable to obtain the internal structure information, change information and attribute information of the entity

In the process of rapid urban renewal, the city only pays attention to the development of individual buildings, but fails to pay attention to the overall environment of the block and the public space, which further leads to the chaos of the urban spatial form; 2. The vitality of the urban public space is lost: there are " The phenomenon of emphasizing parts and neglecting the whole; emphasizing architecture and despising the environment; emphasizing image and despising functions", under the pressure of gradually increasing development, the rough extension of the city, the wanton development of land, and the disorderly expansion of urban boundaries are constantly eroding the natural environment, " The urban form of "ink-stained diffusion" has caused a series of urban and social problems, such as the loss of spatial vitality, the deteriorating environment, social conflicts, and the difficulty in ensuring the quality of public space, which has lost the meaning of place as a living space; 3. Urban space Morphology has research value, but lacks systematic research: Judging from the current research situation, the amount of research on urban spatial morphology is limited. Systematic and specialized quantitative research, related research is also very incomplete, and urgently needs to be supplemented

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