Representations of world coordinates in FITS

Details Representations of world coordinates in FITS Representations of world coordinates in FITS

2002-07-18

arxiv.org/abs/astro-ph/0207407v2

Astron.Astrophys. 395 (2002) 1061-1076

Astronomy and Astrophysics

Astrophysics

15 Pages, 1 figure, LaTex with Astronomy & Astrophysics macro package, submitted to A&A, related papers at http://www.aoc.nr

Scientific paper

10.1051/0004-6361:20021326

The initial descriptions of the FITS format provided a simplified method for describing the physical coordinate values of the image pixels, but deliberately did not specify any of the detailed conventions required to convey the complexities of actual image coordinates. Building on conventions in wide use within astronomy, this paper proposes general extensions to the original methods for describing the world coordinates of FITS data. In subsequent papers, we apply these general conventions to the methods by which spherical coordinates may be projected onto a two-dimensional plane and to frequency/wavelength/velocity coordinates.

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