Multifrequency emission of wheat: Modeling and applications

The microwave brightness temperatures of a wheat field were measured in 199 3, during the whole growth cycle by the six-frequency PORTOS radiometer, at two polarizations and several angles. In this paper, the emissivities meas ured at L-, C-, X-, and K-Band are compared with those simulated by a discr ete multiple scattering model based on the radiative transfer theory. The a greement between experimental and simulated data is generally good at all f requencies, although a unique set of input parameters has been used. It is demonstrated that the model simulations lead to a reliable identification o f the radiometric configurations most sensitive to ground variables, Moreov er, they aid the development of a soil moisture inversion algorithm that pe rforms well even with soils covered by developed vegetation.