The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008 
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distributions is not as important as the previous discussed 
parameters. Several measures can be used, e.g. histogram 
intersection, Log-likelihood statistic or G-statistic and chi- 
square statistic. 
ACKNOWLEDGMENTS 
The authors wish to thank Dr. Topi Maenpaa and Dr. Xiangyun 
Hu for their valuable comments and discussions. 
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