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Research of point distance measurement accuracy of terrestrial 3D laser scanner

LIU Yunbei;CAI Lailiang;School of Surveying and Land Information Engineering,Henan Polytechnic University;  
The rapid development of terrestrial 3Dlaser scanning technology will be applied to more industries,especially engineering measurement,for which the distance between two points is a common indicator of engineering measurement.Because the engineering applications for point cloud precision increasingly demand,based point cloud point spacing measurement accuracy requirement will be improved,and the research on terrestrial 3Dlaser scanner point distance measurement accuracy has practical value.Based on Close-range Photogrammetry Technology,this paper proposes a method to evaluate pointdistance measurement accuracy of the terrestrial 3Dlaser scanner,against the plane round target used in the experiment,and studies the method of calculating target center coordinates based on plane fitting and space projection theory.Based on round geometric features,another method is proposed to calculate the target center,with VC++2010platform develop program to achieve.Comparing the geometric method and the common center of gravity method,this method will smaller error,while the laser scanner is far away targets,it is unable to measure the complete target or causer the data of the target missing that will be given priority.
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