Analysis of backscattering modelling improvements for soil roughness and moisture estimation
Résumé
Soil moisture and roughness parameters play a key role in hydrological and climate studies. Considerable effort has been devoted to the study of radar backscattering responses from natural surfaces, in active microwave remote sensing. Firstly, electromagnetic backscattering models (Kirchoff models, the small perturbation Model) and more recently, the Integral Equation Model (IEM) have been used in order to estimate these parameters. However, different experimental measurements have shown that their use should be restricted to smooth or medium-rough surfaces. For example, the Small Perturbation Model (SPM) is valid only for very smooth soils, IEM shows a validity experimental domain with k s