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Paper: The SIP Convention for Representing Distortion in FITS Image Headers
Volume: 347, Astronomical Data Analysis Software and Systems XIV
Page: 491
Authors: Shupe, D.L.; Moshir, M.; Li, J.; Makovoz, D.; Narron, R.; Hook, R.N.
Abstract: The SIP (Simple Imaging Polynomial) convention provides a convenient means for representing non-linear geometric distortion as polynomials in FITS header keywords. This scheme has been incorporated by the Spitzer Science Center (SSC) into its imaging products, and it is under consideration for wider use. The SIP keywords are read and applied by the SSC's MOPEX mosaicking software, and by several standard analysis tools, including WCSTools, SAOImage, DS9, GAIA/Starlink AST, IDL ASTROLIB, and Drizzle. We provide definitions of how these keywords are used together with standard FITS World Coordinate System (WCS) keywords to relate pixel coordinates to the sky. Some examples illustrate the application of this scheme to actual distorted data.
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