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FITS World Coordinate Systems |
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LiteratureThe FITS "World Coordinate System" (WCS) standard defines keywords and usage that provide for the description of astronomical coordinate systems in a FITS image header. Electronic versions of the four (WCS) papers and related background material are available:
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Software &c.WCSLIB is implemented in C, with support for FORTRAN via a set of wrapper functions. A doxygen-generated programming manual (HTML and PDF) is provided. NEW! (2016/04/05) WCSLIB 5.15 contains a number of minor improvements and bug fixes. Now mostly feature-complete, WCSLIB 5.15 implements the framework of WCS Paper IV, together with the general Polynomial distortion defined therein, and a new Template Polynomial Distortion (TPD). TPD is a superset of the conventional TPV "projection", and the SIP image distortion, which are both fully supported as instances of it, as are DSS, TNX, and ZPX. A general curvilinear axis drawing routine, PGSBOX, for PGPLOT that can optionally interface to WCSLIB, is also included with WCSLIB. Utility program HPXcvt is included with WCSLIB. It converts 1D HEALPix pixelization data stored in a variety of forms in FITS, including ring or nested organization in a binary table extension, into a 2D primary image array with HPX or XPH coordinate representation. An example (13MiB bzip'd) is provided of its application to the WMAP 3-year Internal Linear Combination map. Example FITS files produced for each of the projections in Paper II and for a selection of spectral representations from Paper III, are available for testing purposes. |
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Dr. Mark R. Calabretta ( mcalabre@atnf.csiro.au) Last modified: 2016/04/05 |