WCSsubs Subroutines

These subroutines 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.
These subroutines are part of a larger package of utilities called
WCSTools.  Documentation, to some extent, is online at

http://tdc-www.harvard.edu/software/wcstools/libwcs.

Projection code in wcspos.c is by Bill Cotton of NRAO and is
protected by the Gnu Copyleft.  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 Copyleft.  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 1998 by the Smithsonian Institution,
and noncommercial use is permitted.  If you which to incorporate
any of this code into commercial software, contact dmink@cfa.harvard.edu

-Doug Mink (dmink@cfa.harvard.edu)
 Telescope Data Center
 Harvard-Smithsonian Center for Astrophysics
 Cambridge, Massachusetts
