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A multi-frequency radiometric measurement of soil moisture content over bare and vegetated fieldsAn experiment on soil moisture remote sensing was conducted during July to September 1981 on bare, grass, and alfalfa fields at frequencies of 0.6, 1.4, 5.0, and 10.6 GHz with radiometers mounted on mobile towers. The results confirm the frequency dependence of sensitivity reduction due to the presence of vegetation cover. For the type of vegetated fields reported here, the vegetation effect is appreciable even at 0.6 GHz. Measurements over bare soil show that when the soil is wet, the measured brightness temperature is lowest at 5.0 GHz and highest at 0.6 GHz, a result contrary to the expectation based on the estimated dielectric permittivity of soil-water mixtures and the current radiative transfer model in that frequency range.
Document ID
19820047278
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wang, J. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Schmugge, T. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gould, W. I. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Glazar, W. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fuchs, J. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mcmurtrey, J. E., III (U.S. Science and Education Administration, Field Crops Laboratory, Beltsville MD, United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1982
Publication Information
Publication: Geophysical Research Letters
Volume: 9
Subject Category
Earth Resources And Remote Sensing
Accession Number
82A30813
Distribution Limits
Public
Copyright
Other

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