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David Heitzinger
Figure 10, reconstructed torus.
6.3 Bischofsmütze
“Bischofsmiitze” is the name of a prominent mountain in
Salzburg, Austria. Because of movements of the rock and
threatening rockfall it has to be monitored periodically.
The data capturing has been done by the Engineering
Company Linsinger, St. Johann / Pongau, by photogram-
metric compilation. In multiple stereo-models contourlines
of intervals of 2 and 5 meters have been measured.
This data set revealed some problems: at some locations
the evidence of belonging to the surface is for all con-
cerned triangles too small, so that no triangle could be
inserted into the triangulation. Therefore small holes re-
mained in the triangulation. These holes have to be filled
automatically in a post-processing step.
7 | CONCLUSION
The presented approach has some major advantages:
l. Itis a flexible approach, useable for different applica-
tions.
2. New knowledge can be included easily.
3. The method can deal with most photogrammetric
applications, which are generally difficult to handle.
4. The implemented method of probabilistic reasoning
allows the usage of uncertain knowledge.
Necessary improvements are an increase of efficiency - for
the tessellation as well as the extraction - and a more gen-
eral strategy of rule-selection.
ACKNOWLEDGMENTS
This work has been financed by the Austrian Science Fund
Figure 12, 3D-triangulation of the mountain “Bis-
chofsmiitze”.
(FWF, projects P11336-OMA and P14083-MAT). Thanks to the Engineering Companies Dipl.-Ing. Linsinger (St. Jo-
hann/Pongau, Austria), Dipl.-Ing. Dietrich (Bad Reichenhall, Germany) and Dipl.-Ing. Hóppl (Graz, Austria) for pro-
viding the author with various data sets. Thanks also to Ernst P. Mücke, who provides several 3D data sets under:
http://www.geom.umn.edu/software/cglist/GeomDir/data 1.1.tar.gz).
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 387
