Effective single scattering albedo of corn at C and X-Band

To retrieve soil moisture at vegetated surface by microwave radiometry data, vegetation effect is important to remove. Usually the zero-order model, omega - tau model, is often used where vegetation is treated as an uniform layer. Values of both scattering and attenuation characteristics of vegetation are assigned from experience which there´re slight change at different frequencies or polarizations. As frequencies go higher than L-band, multiple-scattering effect inside vegetation layer and that between vegetation and soil surface is necessary to account for. In this paper, to accurately evaluate vegetation effect at C and X bands, a Matrix-Doubling algorithm is used to retrieve omega and tau of corn. The surface emission model is AIEM that could work well at large roughness and wider frequency range. The preliminary simulation results are presented in this paper.