[5]SOIL-VEG.-ATM. MICROWAVE RADIATIVE TRANSFER MODEL
Variables

ATMOSPHERE	(Liu, 1999)
VEGITATION	(Lakshmi, 2000)	
Physical Temperature
LAI
SAI
Vegetation Water Content
Leaf Inclination Index
Leaf Thickness
Branch Stem Ratio
Polarization Mixing Ratio(Leaf)
Polarization Mixing Ratio(Branch)
SOIL	
Physical Temperature
Soil Water Content
Soil Roughness
Dobson's Parameter(α)
Dobson's Parameter(β)
Dry Soil Density
Bulk Soil Density
Polarization Mixing Ratio(Soil)

Too many variables
for global 

Which variables are 
important(sensitive)?

Which variables are
negligible(can be fixed)?

Which variables can be
estimated globally?

Which frequency (polarization) 
should be used?

Sensitivity Analysis is needed.