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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
  
4. CONCLUSIONS 
The results show the efficiency of the image matching approach 
for the generation of tie points. The tie points are distributed 
evenly over the whole block with a good rate of manifold 
points. An accuracy of 0.4 pixel in position and 0.8 in height is 
achieved. Using a bundle adjustment the ray intersections could 
be improved by a factor of 2 to 3. 
Also the LSM is able to further improve the results by refining 
the FBM and eliminating suboptimal points. In this case of 
planetary imagery it has been found so far that it is reasonable 
to use only two shift parameters for the LSM instead of all six 
affine parameters. 
In areas with very low texture only few points have been found 
which doesn’t pose a problem for the determination of the 
exterior orientation of the camera. Problems raise when a DTM 
needs to be generated in those areas using image matching 
methods. Applying shape from shading can help to close gaps 
in the DTM in areas with low texture (Lohse, Heipke, 2003), 
and we will investigate the combination of both methods in the 
future. 
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6. ACKNOWLEDGEMENTS 
This work is funded by Deutsches Zentrum fur Luft- und 
Raumfahrt e.V. (DLR) under grant no. 50 QM 0104. This 
support is gratefully acknowledged.