Abstract
This study demonstrates a technique of estimating soil moisture using the combined passive/active L-band microwave measurements. It shows 1) evaluation of the small albedo assumption for using dual polarization passive measurements, 2) development of a synthesized technique to estimate soil moisture, and 3) evaluation with ground soil moisture measurements from the SMEX02 experiment data. In this study, we study a combined active/passive technique to estimate surface soil moisture with the focus on the short vegetated surfaces. We first simulated a database for both active and passive signals under Hydros's sensor configurations using the radiative transfer model with a wide range of conditions for surface soil moisture, roughness and vegetation properties that we considered as the random orientated cylinders. Using this database, we developed 1) the techniques to estimate surface soil moisture. We will demonstrate this technique with the model simulated data and its validation with the airborne PALS image data from the soil moisture SMEX'02 experimental data. II. INVERSION MODEL DESCRIPTION The simulation models used in this study are based on the commonly used three components emission and backscattering model concept with no consideration on the polarization dependence of the vegetation extinction properties. They are given as
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