Application of the Dubois-model using experimental synthetic aperture radar data for the determination of soil moisture and surface roughness

Abstract Many models have been developed in the active microwave domain to explain backscatter as a function of soil moisture and/or surface roughness. They can be categorised in three classes: theoretical models, empirical models and semi-empirical models. In this paper we will describe the semi-empirical Dubois-model [Dubois, P., Van Zyl, J., Engman, T., 1995. Measuring soil moisture with imaging radars. IEEE Transactions on Geoscience and Remote Sensing, 33 (4) 915–926.]. The decisive criterion for choosing this model is its tolerance of sparsely vegetated ground surface (NDVI

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