Quantitative retrieval of soil moisture content and surface roughness from multipolarized radar observations of bare soil surfaces

A semiempirical polarimetric backscattering model for bare soil surfaces is inverted directly to retrieve both the volumetric soil moisture content M/sub v/ and the rms surface height s from multipolarized radar observations. The rms surface height s and the moisture content M/sub v/ can be read fro...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2004-03, Vol.42 (3), p.596-601
Main Author: OH, Yisok
Format: Article
Language:English
Subjects:
Applied geophysics
Backscatter
Content based retrieval
Earth sciences
Earth, ocean, space
Equations
Exact sciences and technology
Internal geophysics
Moisture measurement
Parameter estimation
Radar polarimetry
Rough surfaces
Soil measurements
Soil moisture
Soils
Surface roughness
Surficial geology
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Summary:A semiempirical polarimetric backscattering model for bare soil surfaces is inverted directly to retrieve both the volumetric soil moisture content M/sub v/ and the rms surface height s from multipolarized radar observations. The rms surface height s and the moisture content M/sub v/ can be read from inversion diagrams using the measurements of the cross-polarized backscattering coefficient /spl sigma//sub vh//sup 0/ and the copolarized ratio p(=/spl sigma//sub hh//sup 0///spl sigma//sub vv//sup 0/). Otherwise, the surface parameters can be estimated simply by solving two equations (/spl sigma//sub vh//sup 0/ and p) in two unknowns (M/sub v/ and s). The inversion technique has been applied to the polarimetric backscattering coefficients measured by ground-based polarimetric scatterometers and the Jet Propulsion Laboratory airborne synthetic aperture radar. A good agreement was observed between the values of surface parameters (the rms height s, roughness parameter ks, and the volumetric soil moisture content M/sub v/) estimated by the inversion technique and those measured in situ.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2003.821065