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the extraction of trees and man made objects from the best 
possible DSM and VHR satellite imagery. But the results 
gained up to now from each step are encouraging enough to 
follow the path and refine every step of the chain to receive a 
new fully automatic system for generating coarse three- 
dimensional urban models from stereo satellite imagery in a 
short time. 
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ACKNOWLEDGEMENTS 
The authors thank cordially Christian Pentenrieder for the 
comparison, analysis, and evaluation of the different DSM 
generation methods and Martin Brandt for the tedious job of