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6. ACKNOWLEDGEMENTS 
The Vaihingen data set was provided by the German Society for 
Photogrammetry, Remote Sensing and Geoinformation (DGPF ) 
[Cramer, 2010]: http://www.ifp.uni-stuttgart.de/dgpf/DKEP- 
Allg. html (in German). 
This paper is supported by National State Basic Research 
Development Program (973 Program) of China (NO. 
2012CB719904).