NDLI: Satellite microwave observations of soil moisture variations. [by the microwave radiometer on the nimbus 5 satellite

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Satellite microwave observations of soil moisture variations. [by the microwave radiometer on the nimbus 5 satellite

Content Provider	NASA Technical Reports Server (NTRS)
Author	Rango, A. Neff, R. Schmugge, T. J.
Copyright Year	1975
Description	The electrically scanning microwave radiometer (ESMR) on the Nimbus 5 satellite was used to observe microwave emissions from vegetated and soil surfaces over an Illinois-Indiana study area, the Mississippi Valley, and the Great Salt Lake Desert in Utah. Analysis of microwave brightness temperatures (T sub B) and antecedent rainfall over these areas provided a way to monitor variations of near-surface soil moisture. Because vegetation absorbs microwave emission from the soil at the 1.55 cm wavelength of ESMR, relative soil moisture measurements can only be obtained over bare or sparsely vegetated soil. In general T sub B increased during rainfree periods as evaporation of water and drying of the surface soil occurs, and drops in T sub B are experienced after significant rainfall events wet the soil. Microwave observations from space are limited to coarse resolutions (10-25 km), but it may be possible in regions with sparse vegetation cover to estimate soil moisture conditions on a watershed or agricultural district basis, particularly since daily observations can be obtained.
File Size	1846241
Page Count	33
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19760008465
Archival Resource Key	ark:/13960/t6547gw8b
Language	English
Publisher Date	1975-11-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Microwave Radiometers Nimbus 5 Satellite Soil Moisture Emission Spectra Spectrum Analysis Satellite Observation Agriculture Water Resources Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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