Representations of world coordinates in FITS
Abstract
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 twodimensional plane and to frequency/wavelength/velocity coordinates.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 December 2002
 DOI:
 10.1051/00046361:20021326
 arXiv:
 arXiv:astroph/0207407
 Bibcode:
 2002A&A...395.1061G
 Keywords:

 methods: data analysis;
 techniques: image processing;
 astronomical data bases: miscellaneous;
 Astrophysics
 EPrint:
 15 Pages, 1 figure, LaTex with Astronomy &