NDLI: Physical retrieval of surface emissivity spectrum from hyperspectral infrared radiances

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Physical retrieval of surface emissivity spectrum from hyperspectral infrared radiances

Content Provider	NASA Technical Reports Server (NTRS)
Author	Li, Jun Zhou, Daniel K. Weisz, Elisabeth
Copyright Year	2007
Description	Retrieval of temperature, moisture profiles and surface skin temperature from hyperspectral infrared (IR) radiances requires spectral information about the surface emissivity. Using constant or inaccurate surface emissivities typically results in large retrieval errors, particularly over semi-arid or arid areas where the variation in emissivity spectrum is large both spectrally and spatially. In this study, a physically based algorithm has been developed to retrieve a hyperspectral IR emissivity spectrum simultaneously with the temperature and moisture profiles, as well as the surface skin temperature. To make the solution stable and efficient, the hyperspectral emissivity spectrum is represented by eigenvectors, derived from the laboratory measured hyperspectral emissivity database, in the retrieval process. Experience with AIRS (Atmospheric InfraRed Sounder) radiances shows that a simultaneous retrieval of the emissivity spectrum and the sounding improves the surface skin temperature as well as temperature and moisture profiles, particularly in the near surface layer.
File Size	205934
Page Count	21
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20080000848
Archival Resource Key	ark:/13960/t9k40rt94
Language	English
Publisher Date	2007-01-01
Access Restriction	Open
Subject Keyword	Meteorology And Climatology Skin Temperature Non-biological Moisture Atmospheric Moisture Temperature Profiles Infrared Spectra Data Bases Arid Lands Goes Satellites Emissivity Infrared Instruments Algorithms Simulation Infrared Radiation Eigenvectors Surface Layers 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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