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Proceedings Paper

A spherical targets fitting method for terrestrial laser scanning data
Author(s): Jia Li; Dehua Zheng; Qiuping Lan; Qing-qun Liu
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Paper Abstract

The dominating measurement error of Terrestrial Laser Scanner comes from laser ranging, which is also the major cause of "tailing points" appearing at the edge of targets scanned by coaxial laser scanner. Since the existence of such abnormal points, general least squares sphere fitting method cannot correctly position spherical targets or determine the dimension of geometries. Base on the working mechanism of coaxial laser scanner, a surface fitting model is designed in this paper for the spherical targets, and utilize robust least squares method to get model parameters from scanning data with obvious edge noise, then conclude the sphere radius and centre point coordinate. In the end, this paper accomplishes two experiments separately for really scanning data and synthesized data subjecting to scanner's error distribution. The result demonstrates that proposed fitting method can weaken the impact of abnormal points on the edge of spherical targets effectively, get geometric parameters of spherical targets accurately, and exactly locate the spherical targets.

Paper Details

Date Published: 24 October 2011
PDF: 6 pages
Proc. SPIE 8286, International Symposium on Lidar and Radar Mapping 2011: Technologies and Applications, 82860H (24 October 2011); doi: 10.1117/12.912354
Show Author Affiliations
Jia Li, Hohai Univ. (China)
Dehua Zheng, Hohai Univ. (China)
Qiuping Lan, Hohai Univ. (China)
Qing-qun Liu, Hohai Univ. (China)

Published in SPIE Proceedings Vol. 8286:
International Symposium on Lidar and Radar Mapping 2011: Technologies and Applications
Jonathan Li, Editor(s)

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