Research On 3D Laser Point Cloud Data Processing Method Based On Building Characteristics

The terrestrial 3D laser scanning technology as a new technology mainly acquires the point cloud data of the measured object,and then processes the acquired point cloud data to obtain the final result.Compared with traditional surveying and mapping methods,the advantages of largescale,high-density,and measurable point cloud data collection by ground 3D laser scanning make it more widely used.In this paper,the 3D laser point cloud based on architectural features is studied.The Leica 3D laser scanner MS60 is used to obtain the point cloud information of ancient buildings,including the coordinate information,reflectivity,and color information of the points.The ancient buildings are photographed to obtain the ancient The image information of the building is to scan the property information of the ancient building records,including the material of the building components,etc.;according to the characteristics of the ancient architecture,the theory and application of the point cloud processing are studied,the corresponding point cloud information is extracted based on the features of the ancient building components,and finally the acquired information is obtained.The ancient building features point cloud information combined with CAD and BIM to complete drawing and 3D model drawing to meet construction requirements.The main research contents are as follows:(1)Using open-source threedimensional laser point cloud processing software cloudcompare to process the acquired point cloud information with obvious architectural features,including point cloud denoising,point cloud filtering,point cloud simplification,and point cloud A series of processes such as segmentation and classification,extraction of point cloud feature lines,etc.,through the point cloud processing of building features,exploring methods and applications of point clouds in denoising,filtering,segmentation,classification,feature extraction,3D modeling,etc..(2)Extract the outline of building components,combine CAD software and BIM technology,draw two-dimensional maps of point clouds and three-dimensional building information models,establish “family” and record the obtained size information and attribute information,and study point cloud points.The bit precision and the feature line extraction accuracy make the accuracy conform to the construction requirements;(3)With the advantage of BIM technology,the geometric information and attribute information of the ancient building components are recorded and saved,and the two-dimensional figure extraction is achieved through the established BIM model cut.,which provides ideas and methods for the protection and application of ancient architecture for the combination of 3D laser scanning technology and BIM.