What type of soil properties are exploit by using brightness component of T-cap and Bare soil index: (Rikimaru, A., Roy, P.S., Miyatake, S.,2002.

Tropical forest cover density mapping. Tropical Ecology 43(1): 39-47) 

Using the following formula in comparison:

( ( (float(b1)+float(b2)) - (float(b3)+float(b4)) ) / ( (float(b1)+float(b2)) + (float(b3)+float(b4)) ) )

For Landsat Bands: b1 = 5, b2 = 3, b3 = 4, b4 = 1

http://www.tropecol.com/pdf/open/PDF_43_1/43104.pdf

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