Inferring the Effect of Plant and Soil Variables of C and L Backscatter over Agriculture Fields Based on Modelling Analysis

The goal of the study was to apply and modify the semiemperical water-cloud model to simulate bacscattering coefficients of C-VV and L-HH as a function of LAI, vegetation water content and soil moisture. Bacscattering coefficients were compared to these obtained from ERS-2.SAR and JERS.SAR measurements taken simultaneously for the agriculture area in Poland. During time of satellite acquisitions the ground measurements of various soilvegetation parameters were taken. Several approaches have been considered in order to obtain the best results of modelling. The various descriptors of the canopy have been applied in the modelling. The contribution of vegetation features as leaf area expressed in Leaf Area Index, dielectric feature of leaf surface expressed in Leaf Water Area Index and Vegetation Water Content in sigma values has been examined in order to obtain the best fit of the model. The simulation has been performed for various vegetation cover types. For better description of the results the L band bacscatter obtained for rice field in Japan from scatterometer measurements have been included to the analysis. The model gave the possibility to obtain soil moisture and vegetation parameters using the combination of two microwave frequencies. The two–way attenuation of vegetation in three models for C-VV band and L-HH band has been examined. The final results gave the possibilities of comparison of the modelled soil moisture values with field measurements.