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Caltrans Keeps the Spitzer Pipelines Moving

Lee, Wen and Laher, Russ and Fowler, John W. and Masci, Frank J. and Moshir, Mehrdad (2005) Caltrans Keeps the Spitzer Pipelines Moving. In: Astronomical Data Analysis Software and Systems XIV. ASP Conference Series. No.347. Astronomical Society of the Pacific , San Francisco, CA, pp. 594-598. ISBN 1-58381-215-6 http://resolver.caltech.edu/CaltechAUTHORS:20110810-100649471

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Abstract

The computer pipelines used to process digital infrared astronomical images from NASA's Spitzer Space Telescope require various input calibration-data files for characterizing the attributes and behaviors of the onboard focal-plane-arrays and their detector pixels, such as operability, darkcurrent offset, linearity, non-uniformity, muxbleed, droop, and point-response functions. The telescope has three very different science instruments, each with three or four spectral-band-pass channels, depending on the instrument. Moreover, each instrument has various operating modes (e.g., full array or sub-array in one case) and parameters (e.g., integration time). Calibration data that depend on these considerations are needed by pipelines for generating both science products (production pipelines) and higher-level calibration products (calibration pipelines). The calibration files are created in various formats either "off- line" or by the aforementioned calibration pipelines, depending on the above configuration details. Also, the calibration files are generally applicable to a certain time period and therefore must be selected accordingly for a given raw input image to be correctly processed. All of this complexity in selecting and retrieving calibration files for pipeline processing is handled by a procedural software program called "caltrans". This software, which is implemented in C and interacts with an Informix database, was developed at the Spitzer Science Center (SSC) and is now deployed in SSC daily operations. The software is rule-based, very flexible, and, for efficiency, capable of retrieving multiple calibration files with a single software-execution command.


Item Type:Book Section
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Additional Information:© 2005 Astronomical Society of the Pacific. This work was performed at the Spitzer Science Center as part of a mission/project managed by Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
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NASA/JPL/CaltechUNSPECIFIED
Record Number:CaltechAUTHORS:20110810-100649471
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110810-100649471
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24779
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Sep 2011 16:04
Last Modified:22 Dec 2014 01:26

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