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passive microwave remote sensing of soil moisture - the effect of tilled row structureThe tilled row structure in agricultural fields is one of the important factors affecting observations of microwave emission from such fields. Measurements of this effect were performed with L-band and X-band radiometers mounted on a mobile truck on a bare 40 m x 45 m row tilled field; the soil moisture content during measurements ranged from 10 to 30% by dry weight. Results showed that the variations of the antenna temperatures with incident angle changed with the azimuth angle measured from the row direction. It is found that the observed difference between horizontally and vertically polarized antenna temperatures is due to the change in the local angle of field emission within the antenna field of view caused by the large-scale row structure.
Document ID
19810027567
Document Type
Reprint (Version printed in journal)
Authors
Wang, J. R.
(NASA Goddard Space Flight Center Laboratory for Atmospheric Sciences, Greenbelt, Md., United States)
Newton, R. W.
(Texas A & M University College Station, Tex., United States)
Rouse, J. W., Jr.
(Missouri-Columbia, University Columbia, Mo., United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1980
Publication Information
Publication: IEEE Transactions on Geoscience and Remote Sensing
Volume: GE-18
Subject Category
EARTH RESOURCES AND REMOTE SENSING
Distribution Limits
Public
Copyright
Other