WCSsubs Subroutines
These subroutines, developed as part of the WCSTools software package, constitute a self-contained package for accessing the world coordinate systems of FITS or IRAF(.imh) images, with image header I/O contained in fitsfile.c and imhfile.c, and WCS initialization and use through the subroutines in wcs.c. WCS information for an image is kept in a single data structure defined in wcs.h. Pixel to WCS translations are done by calls to pix2wcst() or pix2wcs(). WCS to pixel translations are done by calls to wcs2pix() or wcsc2pix(). The contents of the files are briefly described in Files. Dependencies between these files are given in Makefile. Documentation, to some extent, is online at
http://tdc-www.harvard.edu/software/wcstools/libwcs.wcs.html
Documentation for the entire open-source WCSTools package is online at
http://tdc-www.harvard.edu/software/wcstools/
Projection code in wcspos.c is by Bill Cotton of NRAO and is protected by the Gnu Lesser General Public License, which is stated in the file COPYING. Projection code in wcslib.c, cel.c, lin.c, proj.c, wcstrig.c, and sph.c is by Mark Calabretta of CSIRO and is also protected by the Gnu Lesser General Public License. Code in slasubs.c is by Pat Wallace of the Starlink project at Cambridge University. Doug Mink is responsible for the rest of the code, unless otherwise noted in the source file. Unless otherwise noted, this code is Copyright 2003 by the Smithsonian Astrophysical Observatory and protected by the Gnu Lesser General Public License.
-Doug Mink (dmink@cfa.harvard.edu)
Telescope Data Center
Harvard-Smithsonian Center for Astrophysics
Cambridge, Massachusetts