NDLI: A volume emission model for the radiobrightness of prairie grass

Content Provider	IEEE Xplore Digital Library
Author	England, A.W. Galantowicz, J.F.
Copyright Year	1994
Description	Author affiliation: Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA (England, A.W.; Galantowicz, J.F.)
Abstract	The radiobrightness of snow-free northern prairie at the SSM/I frequencies of 19.35, 37.0, and 85.5 GHz is dominated by absorption and emission by the grass canopy. The authors measured the radiobrightness at SSM/I frequencies of grassland near Sioux Falls, South Dakota, every 15 minutes from October, 1992, through early April, 1993. The apparent H-polarized emissivities for snow-free periods were generally above 0.95. These high emissivities can only be explained by emission from the grass canopy. The vertical distributions of mass and moisture in prairie grass were used to develop a volume emission model for grass over moist soil. The volume emission model was derived from a formally correct version of the radiative transfer equation where radiant intensities were normalized by the refractive index squared. For the 7 cases that were analyzed, scatter darkening was insignificant at 19.35 GHz and significant in only two cases at the higher SSM/I frequencies.
Starting Page	2463
Ending Page	2465
File Size	360424
Page Count	3
File Format	PDF
ISBN	0780314972
DOI	10.1109/IGARSS.1994.399769
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-08-08
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Soil Moisture Atmospheric modeling Frequency Predictive models Electromagnetic wave absorption Scattering Biosphere Satellite broadcasting Temperature
Content Type	Text
Resource Type	Article

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