NDLI: Mapping freeze/thaw boundaries with smmr data

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Mapping freeze/thaw boundaries with smmr data

Content Provider	NASA Technical Reports Server (NTRS)
Author	Dobson, M. C. Zuerndorfer, B. W. Ulaby, F. T. England, A. W.
Copyright Year	1989
Description	Nimbus 7 Scanning Multichannel Microwave Radiometer (SMMR) data are used to map daily freeze/thaw patterns in the upper Midwest for the Fall of 1984. The combination of a low 37 GHz radiobrightness and a negative 10.7, 18, and 37 GHz spectral gradient, Partial Derivative of Tb with Respect to f, appears to be an effective discriminant for classifying soil as frozen or thawed. The 37 GHz emissivity is less sensitive to soil moisture than are the lower frequency emissivities so that the 37 GHz radiobrightness appears to track soil surface temperature relatively well. The negative gradient for frozen ground is a consequence of volume scatter darkening at shorter microwave wavelengths. This shorter wavelength darkening is not seen in thawed moist soils.
File Size	1253694
Page Count	28
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890014590
Archival Resource Key	ark:/13960/t01022q22
Language	English
Publisher Date	1989-01-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Melting Soil Moisture Brightness Surface Temperature Ground Truth Freezing Microwave Radiometers Emissivity Thematic Mapping Diurnal Variations Spectral Emission Nimbus 7 Satellite Mapsat Air Land Interactions Microwave Spectra Infrared Photography 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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