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Analysis of multi-frequency polarimetric data for assessment of bare soil roughness | IEEE Conference Publication | IEEE Xplore

Analysis of multi-frequency polarimetric data for assessment of bare soil roughness


Abstract:

The aim of this study is to assess the bare soil surface roughness parameter, i.e. the root mean square height (h/sub rms/) when the moisture is constant, using anechoic ...Show More

Abstract:

The aim of this study is to assess the bare soil surface roughness parameter, i.e. the root mean square height (h/sub rms/) when the moisture is constant, using anechoic chamber measurements based on fully polarimetric scatterometer data. An incidence angle based algorithm has been proposed to assess the bare soil height h/sub rms/. For this purpose, sets of experimental backscattering data have been evaluated on different types of rough surfaces (Rough Gaussian, h/sub rms/ = 2.5 cm, Smooth Gaussian, h/sub rms/ = 0.4 cm and Medium Mixed surface, h/sub rms/ = 0.9 cm) with known geometrical and dielectric properties. The scattering matrix of those three surfaces under test was measured in monostatic mode vs. frequency ( 1 - 19 GHz) and incidence angles ( /spl theta/ = 10/spl deg/ to 50/spl deg/ in steps of 10/spl deg/ for h/sub rms/ = 2.5 cm and 0.9 cm and 5/spl deg/ for h/sub rms/ = 0.4 cm) data. An empirical relationship has been developed between backscattering, h/sub rms/ and incidence angle independently for L-, C-, X- and Ka-band for all polarizations (i.e. HH, VV and HV). This relationship provides the calculated backscattering values, which is helpful in the inversion process. A good agreement has been obtained between the observed and calculated h/sub rms/. The analyses show the strong dependence of h/sub rms/ on incidence angle, polarization and frequency. This type of work is also helpful in the near future to predict the optimum sensor parameters (i.e. incidence angle, polarization and frequency) for measuring the bare soil roughness.
Date of Conference: 21-25 July 2003
Date Added to IEEE Xplore: 10 May 2004
Print ISBN:0-7803-7929-2
Conference Location: Toulouse, France

References

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