Soil moisture inversion from polarimetric SAR data using three-scale model

First, a polarimetric three-scale scattering model, including a large-scale-slope-induced polarisation orientation angle shift, a moderate-scale orientation angle disturbance and a small-scale Bragg resonance, to describe the polarimetric coherence matrix for a sloped rough surface is introduced. Then, a look-up table is created to demonstrate the relations between polarimetric scattering coefficients and the dielectric constant varying with different terrain slopes. Finally, a look-up-table-based inversion method is developed and airborne AgriSAR 2006 data for a sloped bare soil area are chosen to validate the inversion.