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Talks and Poster Presentations (with Proceedings-Entry):

C. Briese:
"Structure line modelling based on terrestrial laserscanner data";
Talk: ISPRS Technical Commission Symposium, Dresden; 2006-09-25 - 2006-09-27; in: "Symposium of ISPRS Commission V - Image Engineering and Vision Metrology", H. Maas, D. Schneider (ed.); XXXVI/5 (2006), ISSN: 1682-1750; 6 pages.



English abstract:
In the last years, terrestrial laser scanning (TLS) instruments are gaining more and more importance for the 3D data acquisition for a
variety of applications. However, the subsequent modelling procedures are still not standardised for the different applications and
often the result of a TLS project is a registered 3D point cloud. This form of object representation is often applicable for visualisation
purposes, but for the mathematical analysis of the object, advanced representation forms are essential. For this aim, the meshing of
the TLS point cloud is a common procedure. However, it has to be considered that this form of object representation can be directly
altered by random, systematic, and gross errors included in the TLS data. Especially discontinuities are usually erroneously due to the
complex interaction of the laser beam with the illuminated object surface.
Thus, methods that consider possible measurement errors within the process of 3D modelling are essential. Furthermore, an adequate
representation of structure lines within the modelling procedure is important for a high quality object representation. For this aim, an
explicit description of these linear features is necessary. Therefore, in order to enhance the models generated from a TLS point cloud,
this paper focuses on the determination of structure lines. The method is based on a semi-automatic process originally developed for
the modelling of breaklines from airborne laser scanner data. Within this paper, the adaptation of the modelling framework to the
usage of TLS data is presented. Furthermore, it is extended to further types of structure lines. The modelling framework is based on
the irregular distributed TLS point cloud. The usage of a robust estimation procedure together with a sensor specific stochastical
model allows the consideration of measurement errors within the structure line modelling procedure. For the modelling concept, an
approximation of the line is essential. In order to overcome this limitation the process of structure line growing is introduced. This
process allows a semi-automated determination of linear features. Next to this approach, a section with practical examples
demonstrates and discusses the capability of the methods. Finally, an outlook into ongoing research work and a summary conclude
the paper.

Keywords:
Structure line, Modelling, Semi-automation, Terrestrial Laserscanning, Object, Reconstruction


Electronic version of the publication:
http://publik.tuwien.ac.at/files/PubDat_120432.pdf


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