Experimental Analysis of Point Distance Accuracy of Terrestrial 3D Laser Scanner Based on the Need for Repair and Protection of Historical Buildings
In order to study the practical significance of terrestrial laser scanning technology for the repair and protection of historical buildings,and to meet the needs of the repair and protection of historical buildings,this paper uses the Focus3D X330 terrestrial laser scanner(TLS)to measure the scanning distance and horizontal incident angle.The experimental analysis of point distance accuracy is carried out on these influencing factors,and the internal and external coincidence accuracy of the scanner is used as the basis for site layout to seek the best data interval of the scanner,and obtain high-quality measurement data that meets the accuracy requirements.The experimental results show that when the scanning distance is within 5-15 m,the error of the internal and external coincidence ac-curacy is not more than 4 mm.After more than 15 m,the error of the internal and external coincidence accuracy increases sharply and fluctuates greatly;when the horizontal incident angle is 75°—90°,the the error of the internal and external coincidence accuracy is not more than 2 mm,and the maximum error occurs at 15° and the fluctuation is large.The above results can provide a reference for data collection required for the restoration and protection of historical buildings.
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