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FITS World Coordinate Systems |
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LiteratureThe FITS "World Coordinate System" (WCS) convention 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. The main change in WCSLIB 4.4.x (4.4.4 as of 2009/09/14) is a doxygen-generated programming manual (HTML and PDF) which should make it easier to navigate around the WCSLIB functions and data structures. A general curvilinear axis drawing routine, PGSBOX, for PGPLOT that can optionally interface to WCSLIB has been included with WCSLIB since version 2.5. Utility program, HPXcvt 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 coordinate representation. It has been included with WCSLIB since version 4.3. 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: 2010/01/20 |