Registered
FITS Convention (Under Review)
TNX Convention for Representing FITS Image Distortions
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Description:
The TNX World Coordinate System is a non-standard coordinate
system for evaluating
celestial coordinates from the image pixel coordinates. It follows the
FITS conventions for undistorted tangent plane projections but adds a
non-linear distortion term to the evaluation.
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Submitted:
September 2008 by Doug Tody (NRAO), Lindsey
Davis (NOAO), and Frank Valdes (NOAO)
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Registered:
TBD
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Date and Place of First Usage:
circa 1998 for NOAO data and support within the IRAF system.
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Extent of Usage:
The TNX convention is currently used in the FITS files
produced by NOAO that are taken with a variety of different
imaging instruments including MOSAIC and NEWFIRM.
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Full Documentation:
HTML format,
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Comments and/or critiques:
FITSBITS discussion
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Sample FITS File:
tnx.fits
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Sample Header Listing:
tnx.txt (edited to show only the relevant keywords)
Last revised: Friday, 18-Sep-2009 13:44:14 EDT
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