On the Application of Three-dimensional (3-D) Laser Scanning Technology in Historic Building Elevation Drawing

This paper studies the application of three-dimensional (3-D) laser scanning point cloud data in drawing building elevation. Take the representative historic building North Gate of Yunlong Mountain as the research object in the city of Xuzhou. In order to verify the accuracy of point cloud data, the accuracy quality of point cloud data analyses by measuring 26 point coordinates on the building surface. It is concluded that the mean square error (MSE) of plane point position is +/- 0.023 m and the MSE of elevation is +/- 0.015 m. On the premise that the accuracy meets the requirements of Quality Inspection and Acceptance of Surveying and Mapping Results (GB/T24356-2009) and the Code for Engineering Survey (GB50026-2020). Then draw building elevation. The MSE of the measured distance difference between the length of the characteristic part on the building elevation drawn by point cloud data and the corresponding part of the North Gate of Yunlong Mountain is +/- 6.0 mm. This paper analyses the main sources of error. Applies the elevation of the North Gate of Yunlong Mountain drawn by point cloud data in protection of historic buildings, which can meet the needs of practical engineering, so the application prospect of 3-D laser scanning is considerable in protection and repair of historic buildings.