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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004 
       
HELLO OA) 
Figure 7: Results of the automatic approach for extraction of 
trees. Trees are depicted as white circles, the 
background image is a part of the CIR 
orthoimage. The subset is equivalent to the scene 
in Figure 2. 
For the 3D visualisation in Figure 2 the diameter of the trees 
were used to scale the whole 3D model of the tree. Further 
work will be on a refinement of the visualisation: The shape 
and the colour of the extracted trees shall be used to define 
different classes of trees models in order to get a more 
realistic visualisation. As the algorithm was originally 
designed for the extraction of trees from image data (and the 
surface model, which can be computed from image using 
correlation techniques), the last pulse data of the laser 
scanner is not used at the moment. This additional 
information will be used to make the extraction more reliable 
and complete. 
ACKNOWLEDGEMENT 
The author would like to thank Claus Brenner, who has 
sponsored the laser scan from his project at the institute of 
cartography and geoinformatics. The buildings of the 
Hanover 3D city model were reconstructed by Adele 
Elmhorst and Ulla Wissmann. Only with their work it was 
possible to make this paper as it is: with the example 
including buildings. Many thanks go also to the students and 
tutors of the Seminar-3D-Team for their work in the recent 
project seminar. 
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