Application Of Three-dimensional Laser Scanning Technology In Building Elevation Surveying And Mapping

Urban architecture is a window of city image display and an important carrier of city culture.In the process of urban development,many former urban buildings have been unable to adapt to the development of the city,so the maintenance and improvement of some buildings has caused problems that can not be ignored in the process of urban development.How to complete the building surveying and mapping work with high quality in the shortest time,and preserve the data permanently to realize the digitalization and visualization of buildings is the ideal goal of urban building reconstruction.Three-dimensional laser scanning technology is a new modern surveying and mapping technology.Compared with traditional surveying and mapping technology,it has incomparable unique advantages and irreplaceable value.Its appearance promotes the continuous progress of building surveying and mapping technology.Based on the basic composition,working principle and general working flow of three-dimensional laser scanning technology,combined with the analysis results of the influence of different materials,horizontal angles and ranging on the accuracy of point clouds,the scanning scheme is formulated.Taking the Chaisanglu Education Bureau Building in Jiujiang City as an example,the point clouds data on the surface of the building are obtained,the subsequent data processing and three-dimensional modeling are carried out,and the correlation is carried out.Accuracy analysis.The main research contents are as follows:(1)By scanning different reflective surfaces,different scanning distances and different horizontal angles,the accuracy of three-dimensional laser scanner in different materials,horizontal angles and ranging is studied and analyzed,in order to verify the feasibility of applying the scanner to practical cases.(2)Through practical cases,the specific steps of data acquisition process of three-dimensional laser scanner are described.Based on the site survey of the survey area environment and the analysis results of the influence of different materials,horizontal angles and ranging on the accuracy of point cloud,the corresponding implementation plan was formulated,and the scanning work of the building of Chaishang Road Education Bureau in Jiujiang City was completed,and the original three-dimensional point cloud data were obtained.Then data processing tasks are carried out with software.(3)Based on the point cloud data of the Educational Bureau Building,the establishment of the point cloud model and the drawing of elevation map of the Educational Bureau Building have been completed,and the feasibility has been verified by the accuracy analysis.The three-dimensional model of the Educational Bureau Building has been constructed by combining the point cloud data,image photos and topographic map of the Educational Bureau Building,which provides a real and reliable sunshine analysis for the later Educational Bureau Building.Three-dimensional solid model data,and through accuracy analysis,verify the feasibility.