The Atmospheric Infrared Spectrometer (AIRS) Science Processing System is a collection of computer programs, denoted product generation executives (PGEs), for processing the readings of the AIRS suite of infrared and microwave instruments orbiting the Earth aboard NASA 's Aqua spacecraft. Following from level 0 (representing raw AIRS data), the PGEs and their data products are denoted by alphanumeric labels (1A,1B, and 2)that signify the successive stages of processing. Once level-0 data have been received, the level-1A PGEs begin processing, performing such basic housekeeping tasks as ensuring that all the Level-0 data are present and ordering the data according to observation times. The level-1A PGEs then perform geolocation-refinement calculations and conversions of raw data numbers to engineering units. Finally, the level-1A data are grouped into packages,denoted granules, each of which contain the data from a six-minute ob- servation period. The granules are forwarded, along with calibration data,to the Level-1B PGEs for processing into calibrated, geolocated radiance prod- ucts. The Level-2 PGEs, which are not yet operational, are intended to process the level-1B data into temperature and humidity profiles, and other geophysical properties.

This program was written by Solomon De Picciotto, Albert Chang, Zi-Ping Sun, Yuan- Ti Ting, Evan Manning, Steven Gaiser, Bjorn Lambrigtsen, Mark Hofstadter, Thomas Hearty, Thomas Pagano, Hartmut Aumann, and Steven Broberg of Caltech for NASA 's Jet Propulsion Laboratory. For further information, access the Technical Support Package (TSP) free on-line at under the Software category.

This software is available for commercial licensing. Please contact Don Hart of the California Institute of Technology at (818) 393-3425.

Refer to NPO-35243.

This Brief includes a Technical Support Package (TSP).
Initial Processing of Infrared Spectral Data

(reference NPO-35243) is currently available for download from the TSP library.

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This article first appeared in the November, 2004 issue of NASA Tech Briefs Magazine.

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