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A multi-frequency measurement of thermal microwave emission from soils - The effect of soil texture and surface roughnessAn experiment on remote sensing of soil moisture content was conducted over bare fields with microwave radiometers at the frequencies of 1.4 GHz, 5 GHz, and 10.7 GHz during July September of 1981. Three bare fields with different surface roughneses and soil textures were prepared for the experiment. Ground truth acquisition of soil temperatures and moisture contents for 5 layers down to the depth of 15 cm was made concurrently with radiometric measurements. The experimental results show that the effect of surface roughness is to increase the soils' brightness temperature and to reduce the slope of regression between brightness temperature and moisture content. The slopes of regression for soils with different textures are found to be comparable, and the effect of soil texture is reflected in the difference of regression line intercepts at brightness temperature axis. The result is consistent with laboratory measurement of soils' dielectric permittivity. Measurements on wet smooth bare fields give lower brightness temperatures at 5 GHz than at 1.4 GHz. Previously announced in STAR as N82-24550
Document ID
19830064885
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wang, J. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Oneill, P. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jackson, T. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Engman, E. T.
(U.S. Department of Agriculture, Agricultural Research Center Beltsville, MD, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1982
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: 1982 International Geoscience and Remote Sensing Symposium
Location: Munich
Start Date: June 1, 1982
End Date: June 4, 1982
Accession Number
83A46103
Distribution Limits
Public
Copyright
Other

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