Architectural Fine Reconstruction And Component Individualization Extraction Close To Photogrammetr

Nowadays,quickly and accurately extracting the information of buildings and their individual components is one of the key contents in urban management,geospatial planning,digital twin,and virtual reality technologies.With the rapid development of UAV technology,building reconstruction has been gradually developed from traditional vertical and tilt photogrammetry technologies to the highly-accurate close photogrammetry technologies.Because the models reconstructed by close photogrammetry techniques contain a large amount of contextual information,accurate geometric structures,and clear texture features,close photogrammetry has become a hot research direction of 3D building reconstruction,attracting more attentions of many scholars.This study takes buildings in complex scenes as the target,carries out UAV close photogrammetry data acquisition,fine modeling,line feature extraction and component monomer on the model.The main research contents are as follows:(1)Route planning and design of UAV photogrammetry,including coarse building model generation,target point selection,target surface analysis,photographic viewpoint planning,path search optimization,route file compilation,aerial triangulation solution,image intensive matching.The close photogrammetry flight path is generated to ensure the coverage and geometric accuracy of 3D grid model reconstruction.The close photogrammetry route planning method in this paper is more complete and smooth,and the coverage rate and structure accuracy of the reconstructed triangular mesh model are higher.(2)Extraction of structural feature lines of building grid models.The main content is to analyze the direction clustering algorithm according to the normal vector of the triangular plane in the 3D building model.According to the different orientation of the normal vector,the building model is divided into different areas,and the divided line between these areas is obtained,which is the structural characteristic line of the mesh model.The spatial line feature extraction method based on 3D model can extract the key structural information of the building and its components,make the grid model of the building more accurate,and provide geometric modeling parameters for the extraction of the model components.(3)Monomer extraction of building components,mainly using parametric modeling method to establish spatial geometric model and reshape triangulation,and fusion with surface texture samples,finally obtain building parameter model.The parametric component monomer extraction method can reconstruct the window component,improve the expression quality of the building,and make the model lightweight to a certain extent.