Statistical evaluation of the B-Splines approximation of 3D point clouds

verfasst von
Hamza Alkhatib, Boris Kargoll, Johannes Bureick, Jens-André Paffenholz

Terrestrial laser scanning (TLS) has proved to be a suitable technique for geodetic monitoring of infrastructure buildings such as bridges as it allows to determine object changes and deformations rapidly with high precision as well as high spatio-temporal resolution. In addition, this monitoring includes the evaluation of their life cycle and the developing of concepts to increase their expected life time. In an interdisciplinary project, which is being conducted with partners from industry and research, an historic masonry arch bridge over the river Aller near Verden (Lower Saxony, Germany) has been investigated. Besides different other sensors, a terrestrial laser scanner was used to measure the vertical deflection of the bridge construction under different load scenarios. The resulting 3D point clouds have been spatially approximated using approaches of free-form curves and surfaces, based on B-Splines. The selection of the degree of the basis functions and of the number of control points has a considerable and crucial effect on the estimating results of the B-Splines. To assess the statistical significance of the differences displayed by the estimates for different model choices, two non-nested model selection testsas well as information criteria will be adopted and applied.

Geodätisches Institut
Aufsatz in Konferenzband

Details im Forschungsportal „Research@Leibniz University“