Talks and Poster Presentations (with Proceedings-Entry):

C. Nothegger:
"Improving Completeness of Geometric Models from Terrestrial Laser Scanning Data";
Talk: International Symposium of CIPA, Prague, Czech Republic; 2011-09-12 - 2011-09-16; in: "XXIIIrd International CIPA Symposium, Prague, Czech Republic", (2011), 9 pages.

English abstract:
The application of terrestrial laser scanning for the documentation of cultural heritage assets is becoming
increasingly common. While the point cloud by itself is sufficient for satisfying many documentation needs, it
is often desirable to use this data for applications other than documentation. For these purposes a
triangulated model is usually required. The generation of topologically correct triangulated models from
terrestrial laser scans, however, still requires much interactive editing. This is especially true when
reconstructing models from medium range panoramic scanners and many scan positions. Because of
residual errors in the instrument calibration and the limited spatial resolution due to the laser footprint, the
point clouds from different scan positions never match perfectly. Under these circumstances many of the
software packages commonly used for generating triangulated models produce models which have
topological errors such as surface intersecting triangles, holes or triangles which violate the manifold
We present an algorithm which significantly reduces the number of topological errors in the models from
such data. The algorithm is a modification of the Poisson surface reconstruction algorithm. Poisson surfaces
are resilient to noise in the data and the algorithm always produces a closed manifold surface. Our modified
algorithm partitions the data into tiles and can thus be easily parallelized. Furthermore, it avoids
introducing topological errors in occluded areas, albeit at the cost of producing models which are no longer
guaranteed to be closed. The algorithm is applied to scan data of sculptures of the UNESCO World Heritage
Site Schönbrunn Palace and data of a petrified oyster reef in Stetten, Austria. The results of the methodīs
application are discussed and compared with those of alternative methods.

laser scanning, modeling, cultural heritage, automation, documentation, triangulation

Electronic version of the publication:

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