Representations of world coordinates in FITS

By E. Greisen, M. Calabretta. 2002

206 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/6aa24ee46990fc8ca4e269655cb07caf3a2f4709

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Citations in the corpus

The Dark Energy Survey: Data Release 1 (2018, methodology): “First, the World Coordinate System (WCS; Calabretta & Greisen 2002; Greisen & Calabretta 2002) information for each image is updated to reflect the astrometric shifts solved in the previous step.”
The Effelsberg-Bonn H i Survey: Milky Way gas - First data release (2015, background): “Full-(northern-)sky column density maps are published in FITS format (Hanisch et al. 2001, and references therein) in two sky projections, zenith-equal-area (ZEA; see Greisen & Calabretta 2002; Calabretta & Greisen 2002, compare Fig.”
APF—The Lick Observatory Automated Planet Finder (2014, methodology): “The eosgcam service delivers images from the APF Guide Camera (see § 6.2) that conform to the FITS standard (Hanisch et al. 2001; Greisen and Calabretta 2002; Calabretta and Greisen 2002) and employs the FITS world coordinate system (WCS) conventions to produce FITS files that include header…”
Coordinate systems for solar image data (2006, methodology): “This document outlines the various possible coordinate systems which may be used for solar image data, and to show how these coordinate systems relate to the World Coordinate System (WCS) formalism used in FITS files.”
The SunPy Project: Open Source Development and Status of the Version 1.0 Core Package (2020, methodology): “NDCube enhances the functionality of NDData by adding support for handling coordinate transformations through the World Coordinate System (WCS) architecture commonly used in solar physics (Greisen & Calabretta 2002; Thompson 2006).”
wsclean: an implementation of a fast, generic wide-field imager for radio astronomy (2014, methodology): “A recentred image can be stored in a FITS file with the orthographic (SIN) projection normally used in interferometric imaging (Calabretta & Greisen 2002), by setting the centre of tangent projection with the CRPIXi keyword (Greisen & Calabretta 2002).”
1SXPS: A DEEP SWIFT X-RAY TELESCOPE POINT SOURCE CATALOG WITH LIGHT CURVES AND SPECTRA (2013, methodology): “Stacked image creation Our source detection software works in the sky (x, y) coordinate system, which is a virtual system constructed using a tangent plane projection such that (x, y) has a linear mapping to (RA, Dec) (see Greisen & Calabretta 2002; Calabretta & Greisen 2002).”
CALIFA, the Calar Alto Legacy Integral Field Area survey - III. Second public data release (2012, methodology): “The FITS header contains the standard keywords that register the spatial axes to the standard World Coordinate System (WCS, Greisen & Calabretta 2002) and the wavelength to the spectral axis in a linear grid.”
Astropy: A community Python package for astronomy (2013, methodology): “This library is speciﬁc to WCS as it relates to FITS as described in the FITS WCS papers (Greisen & Calabretta 2002; Calabretta & Greisen 2002; Greisen et al. 2006) and is distinct from a planned Astropy package that will handle WCS transformations in general, regardless of their representation.”
HI4PI: a full-sky H i survey based on EBHIS and GASS (2016, methodology): “The second and third data releases also use a Gaussian-convolution based gridding software (Kalberla et al. 2010) but, unlike cygrid and Gridzilla, it lacks full support of the FITS (Hanisch et al. 2001) world coordinate system standard (WCS; Greisen & Calabretta 2002; Calabretta & Greisen 2002).”
ASTROIMAGEJ: IMAGE PROCESSING AND PHOTOMETRIC EXTRACTION FOR ULTRA-PRECISE ASTRONOMICAL LIGHT CURVES (2016, background): “Pixel and World Coordinate System (WCS; Greisen & Calabretta 2002; Calabretta & Greisen 2002; Greisen et al. 2006) information describing the image location pointed to by the mouse cursor is displayed in the three rows above the quick access icons.”
GASS: THE PARKES GALACTIC ALL-SKY SURVEY. I. SURVEY DESCRIPTION, GOALS, AND INITIAL DATA RELEASE (2009, background): “Part of Gridzilla’s later development involved adding full support for FITS celestial and spectral world coordinate systems (Greisen & Calabretta 2002; Calabretta & Greisen 2002; Greisen et al. 2006).”
Monte Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis (2006, background): “‡ The aberration parameter is read in two modules. long as the WCS (world coordinate system; Greisen & Calabretta 2002; Calabretta & Greisen 2002) keywords are correctly assigned, one may use an image for source image.”