The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B5. Beijing 2008 
are taken close in space to each other and thus they form natural 
sequences. 
Finally, we are on the way to implement what we have 
discussed in Section 4. The aim are image configurations 
consisting of networks of sequences in built-up areas which will 
be used for highly detailed 3D reconstruction. What is 
particularly lacking is the possibility to match images 
independent of image scale. While the Scale Invariant Feature 
Transform - SIFT (Lowe, 2004) is the obvious solution, we also 
consider PCA-SIFT (Ke and Sukthankar, 2004) and the findings 
of (Mikolajczyk et al., 2005, Mikolajczyk and Schmid, 2005). 
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