Talks and Poster Presentations (with Proceedings-Entry):

C. Harmening, H.-B. Neuner:
"Detecting Rigid Body Movements from TLS-Based Areal Deformation Measurements";
Talk: 78th FIG Working Week 2016, Christchurch, Neuseeland; 2016-05-02 - 2016-05-06; in: "Proceedings of 78th FIG Working Week 2016", (2016), Paper ID 8322, 11 pages.

English abstract:
The use of Terrestrial Laserscanning for deformation measurements is well-established in engineering geodesy. However, the available processing techniques in order to obtain deformations from point clouds and for the respective statistical assessment are quite restrictive. This paper describes an approach to obtain rigid body movements of objects based on point clouds that were recorded in consecutive epochs. The introduced approach comprises two steps. In the first step for each epoch the object´s geometry is modelled as a B-Spline surface. The main concepts of the object modelling using B-Splines are introduced in the paper. In the second step the elements of the rigid body movements are derived using a similarity transformation between the control points of the modelled B-Spline surfaces. One advantage of the introduced approach is that it uses well-known point-based methods of deformation analysis while allowing areal-based considerations at the same time. The applicability and the performance of the method are shown for measurements obtained at an aluminium-test specimen forming a B-spline surface with known parameters. The rigid body movement´s components obtained from the point clouds are statistically compared with those obtained from point-based measurements of a lasertracker.

Terrestrial Laser Scanning (TLS), B-Spline, Control Points

Created from the Publication Database of the Vienna University of Technology.