Surface parameters refer to the complex dielectric constants

moisture

surface rms height and coherent length

etc. This paper analysed the simplified one-step IEM Model

and estimated the backscattering coefficients

dielectric constants and surface roughness（rms height and coherent length） with the SIR-C L-band Polarimetric data for Xinjiang area. The surface parameters derived from polarimetric data can he used to analyse the forming courses

time and stages of alluvial fans.