Systematic Geometrical Errors of Scanning Spherical Surfaces

Authors: Štroner, M.¹; Pospíšil, J.²

Source: Survey Review, Volume 43, Number 323, October 2011 , pp. 731-742(12)

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Abstract:

Laser scanning systems of today play a significant role in everyday surveying practice. When testing the features of orthogonal fitting on real data, unsubstantiated variables of systematic deviation were noted during the fitting points with a sphere or cylinder, both in the radius and in the position of the centre (of the axis). The stated phenomenon has a systematic character and varies in size. Systematic errors arising from scanning of surfaces with nonzero curvature were analyzed for the first time with numeric simulation. The results of the simulation show that the systematic errors are not too large in comparison with the standard deviation of the measured length, however their influence increases significantly if not the entire object is scanned. The described phenomenon does not affect all points in the same way; in some cases this variability cause large deviations of the fitted shapes.

Keywords: 3D SCANNING; SYSTEMATIC ERROR; ORTHOGONAL FITTING

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/003962611X13117748892678

Affiliations: 1: Department of Special Geodesy, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic;, Email: martin.stroner@fsv.cvut.cz 2: Department of Special Geodesy, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic

Publication date: 2011-10-01

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