The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B7. Beijing 2008 
essence selecting differential transforms for the logarithm of 
reflectance as variables. It was obvious that this transform type 
is extremely sensitive to SOM content. Both our soil samples 
collected from Yixing and Hengshan County in China and 
Krishnan’s soil samples collected from Illinois in America are 
all proved this point. 
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