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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004 
  
The extracted wind erosion obstacles are not only described by 
their direct appearance in geometry, but also a 2D elongated 
shadow region next to and in a known direction (e.g. northern 
direction at noon) according to their height information. First 
results of extracted wind erosion obstacles are quite satisfying 
(Figure 11). As can be seen, most wind erosion obstacles are 
extracted automatically, only one hedge (center of Figure 11) and 
a few short tree rows (bottom right of Figure 11) are missing. 
When compared with Figure 8, one can see that the line of the 
missed hedge is extracted and linked successfully. This line is 
grouped into the longer line because they are very close to each 
other and the DSM information is not enough precise. 
S. CONCLUSIONS 
. An effective approach of extraction wind erosion obstacles to 
enhance the Digital Soil Science Map of Lower Saxony 
(Germany) by integrating GIS data, DSM and aerial imagery is 
presented. Prior knowledge from GIS and DSM is essential to 
facilitate the extraction of interested objects. The extracted wind 
erosion obstacles are not only described by their direct 
appearance in geometry, but also a 2D elongated shadow region 
next to and in a known direction according to their height 
information. All wind erosion obstacles are field boundaries or at 
least parallel with a short distance in between. This information 
can be integrated into the second process of extracting field 
boundaries. Furthermore, the extracted wind erosion obstacles 
can be used in many applications such as precision farming and 
soil preservation. 
Extraction of wind erosion obstacles by integrating separately 
extracted field boundaries, orhthoimage (if available) and the data 
already used in this paper will be our work in the near future. An 
overall evaluation of separately extracted wind erosion obstacles 
and field boundaries to improve the completeness and correctness 
of the achieved results also need to be performed. 
ACKNOWLEDGEMENT 
The author would give many thanks to staffs of Institute of 
Photogrammetry and Geolnformation (IPI), University of 
Hannover, especially Prof. Konecny, Prof. Heipke and Dr. 
Jacobsen for giving the opportunity to do this interesting work 
while staying in IPI as a guest researcher. 
This work is also supported by National Natural Science 
Foundation of China (NSFC) with project number 40301041. 
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