NDLI: Passive microwave sensing of soil moisture content: soil bulk density and surface roughness

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Passive microwave sensing of soil moisture content: soil bulk density and surface roughness

Content Provider	NASA Technical Reports Server (NTRS)
Author	Wang, J. R.
Copyright Year	1982
Description	Microwave radiometric measurements over bare fields of different surface roughnesses were made at the frequencies of 1.4 GHz, 5 GHz, and 10.7 GHz to study the frequency dependence as well as the possible time variation of surface roughness. The presence of surface roughness was found to increase the brightness temperature of soils and reduce the slope of regression between brightness temperature and soil moisture content. The frequency dependence of the surface roughness effect was relatively weak when compared with that of the vegetation effect. Radiometric time series observation over a given field indicated that field surface roughness might gradually diminish with time, especially after a rainfall or irrigation. This time variation of surface roughness served to enhance the uncertainty in remote soil moisture estimate by microwave radiometry. Three years of radiometric measurements over a test site revealed a possible inconsistency in the soil bulk density determination, which turned out to be an important factor in the interpretation of radiometric data.
File Size	2480559
Page Count	33
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19840003488
Archival Resource Key	ark:/13960/t6p030q06
Language	English
Publisher Date	1982-05-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Density Mass/volume Microwave Radiometers Earth Resources Program Agristars Project Moisture Content Soil Moisture Brightness Temperature Surface Roughness Regression Analysis Ground Truth Permittivity Microwave Emission Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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