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Channel alignment and radiometry in hyperspectral atmospheric infrared sounders

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dc.contributor.author Elliott, Denis A.
dc.contributor.author Aumanna, H. H.
dc.contributor.author Pagano, Thomas S.
dc.contributor.author Overoye, Kenneth R.
dc.contributor.author Schindler, Rudolf A.
dc.date.accessioned 2006-07-13T21:09:19Z
dc.date.available 2006-07-13T21:09:19Z
dc.date.issued 2005-03-28
dc.identifier.citation Defense and Security Symposium 2005, Orlando, Florida, March 28 - April 1, 2005. en
dc.identifier.clearanceno Defense and Security Symposium 2005, Orlando, Florida, March 28 - April 1, 2005.
dc.identifier.clearanceno 05-0631
dc.identifier.uri http://hdl.handle.net/2014/39508
dc.description.abstract The Atmospheric Infrared Sounder (AIRS) is a hyper-spectral infrared sounder which covers the 3.7 to 15,4 micron region with 2378 spectral channels. The AIRS instrument specification called for spatial co-registration of all channels to better than 2% of the field of view. Pre-launch testing confirmed that this requirement was met, since the standard deviations in the centroids was about 1% of the 13.5 km IFOV in scan and 3% in track. Detailed analysis of global AIRS data show that the typical scene gradient in 10 micron window channels is about I .3K/km rms. The way these gradients, which are predominantly caused by clouds, manifest themselves in the data depends on the details of the instrument design and the way the spectral channels are used in the data analysis, AIRS temperature and moisture retrievals use 328 of the 2378 channels from 17 independent arrays. As a result, the effect of the boresight misalignment averages to zero mean. Any increase in the effective noise is less than 0.2K. Also, there is no discernable performance degradation of products at the 45 km spatial resolution in the presence of partially cloudy scenes with up to 80% cloudiness. Single pixel radiometric differences between channels with boresight alignment differences can be appreciable and can affect scientific investigations on a single 15km footprint scale, particularly near coastlines, thunderstorms and surface emissivity inhomogeneities. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 2154375 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2005. en
dc.subject Atmospheric Infrared Sounder (AIRS) en
dc.subject sounders en
dc.subject hyperspectral en
dc.subject infrared en
dc.subject spatial en
dc.subject calibration en
dc.title Channel alignment and radiometry in hyperspectral atmospheric infrared sounders en
dc.type Preprint en


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