data, DSM break-lines are extracted within regions, where
buildings are expected, and matched against a parameter-
ized building model [Haala 1995]. Figures 7 to 9 give an
example of the executed 3D building reconstruction. Us-
ing the DSM shown in figure 7 a perspective view of the
Digital Surface Model used for break-line extraction, the
resulting CAD-like description of the reconstructed build-
ings is given in figure 8. For better visualization of the
results, the roofs of the reconstructed buildings were addi-
tionally projected to the corresponding section of an aerial
image (figure 9).
Figure 7: 3D view of used laser data
Figure 8: 3D view of reconstructed buildings
Figure 9: Houses projected to image
388
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B3. Vienna 1996
4 CONCLUSIONS
Using airborne laser scanning systems an direct 3D meas-
urement of the terrain surface is possible. The derivation
of different area covering 3D descriptions of the terrain sur-
face, like Digital Terrain Modell or a Digital Surface Model
can be performed by using different filtering processes on
the laser data. Especially in regions, like forest areas or
coastal areas, where photogrammetric data is difficult the
presented system provides an excellent tool for fast and
efficient 3D data capture. Fusing the distance informa-
tion with other data sources, like intensity information for
the 3D reconstruction of buildings shows additionally the
enormous potential of this kind of information.
ACKNOWLEDGMENT
TopoSys in Ravensburg, Germany is gratefully acknow-
ledged for providing the test data sets. Especially Dr.
Lohr and his co-workers Dr. Schäfer and Dr. Lôffler are
thanked for their support.
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