A semi-empirical backscattering model at L-band and C-band for a soybean canopy with soil moisture inversion

Radar backscatter measurements of a pair of adjacent soybean fields at L-band and C-band are reported. These measurements, which are fully polarimetric, took place over the entire growing season of 1996. To reduce the data acquisition burden, these measurements were restricted to 45/spl deg/ in elev...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2001-04, Vol.39 (4), p.864-872
Main Authors: de Roo, R.D., Yang Du, Ulaby, F.T., Dobson, M.C.
Format: Article
Language:English
Subjects:
Applied geophysics
Azimuth
Backscatter
Backscattering
Channels
Data acquisition
Data mining
Density
Earth sciences
Earth, ocean, space
Exact sciences and technology
Frequency
Internal geophysics
Inversions
L-band
Mathematical models
Radar measurements
Radar polarimetry
Soil moisture
Soils
Soybeans
Surficial geology
Vegetation
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Summary:Radar backscatter measurements of a pair of adjacent soybean fields at L-band and C-band are reported. These measurements, which are fully polarimetric, took place over the entire growing season of 1996. To reduce the data acquisition burden, these measurements were restricted to 45/spl deg/ in elevation and to 45/spl deg/ in azimuth with respect to the row direction. Using the first order radiative transfer solution as a form for the model of the data, four parameters were extracted from the data for each frequency/polarization channel to provide a least squares fit to the model. For inversion, particular channel combinations were regressed against the soil moisture and area density of vegetation water mass. Using L-band cross-polarization and VV-polarization, the vegetation water mass can be regressed with an R/sup 2/=0.867 and a root mean square error (RMSE) of 0.0678 kg/m/sup 2/. Similarly, while a number of channels, or combinations of channels, can be used to invert for soil moisture, the best combination observed, namely, L-band VV-polarization, C-band HV- and VV-polarizations, can achieve a regression coefficient of R/sup 2/=0.898 and volumetric soil moisture RMSE of 1.75%.
ISSN:0196-2892
1558-0644
DOI:10.1109/36.917912