WCS_DEMO

       Demonstrate the basic capabilities of procedures WCSSPH2XY & WCSXY2SPH

       Mapping and Auxilary FITS Demo Routine

       .run wcs_demo: compiles wcs_demo and the supporting demo routines
       wcs_demo: run the demo

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       This is a demo program which is meant to call the routines
       wcssph2xy.pro and wcsxy2sph.pro.  Since the purpose of this
       routine is both to show what the routines can do and what the
       user has to do, a file is created with all of the commands
       needed to complete the desired operation.  Wcs_demo actually
       executes this command file, so the user can exactly duplicate
       the results by simply re-executing this file.  Also, this
       allows a user to edit an already existing file which calls
       wcssph2xy.pro and wcsxy2sph.pro properly and extend the file's
       usefulness.  This demo program allows several possible tests.
       The first option is to simply draw a grid of evenly spaced
       latitude and longitude lines in a particular map transformation.
       Another possibility is to do a full loop, creating a Cartesian
       grid of latitude and longitude lines and calling wcssph2xy.pro
       to convert them to a particular map.  Then, wcsxy2sph.pro is
       called to invert the process and the difference between the
       original and final latitudes and longitudes can be plotted.
       This allows one to assess the level of the numerical errors
       introduced by the mapping routines.  A third possible option is to
       look at some of the map transformations and include rotations of
       the reference points so that a different perspective is given.

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       SPHDIST(), WCSXY2SPH, WCSSPH2XY

       Copyright 1991, The Regents of the University of California. This
       software was produced under U.S. Government contract (W-7405-ENG-36)
       by Los Alamos National Laboratory, which is operated by the
       University of California for the U.S. Department of Energy.
       The U.S. Government is licensed to use, reproduce, and distribute
       this software. Neither the Government nor the University makes
       any warranty, express or implied, or assumes any liability or
       responsibility for the use of this software.

       Rick Balsano

       1.1     8/31/93
       1.2     3/19/96 - J. Bloch - LANL
                        - Made compatible with wcslib-2.2 by Calabretta.
       Converted to IDL V5.0   W. Landsman   September 1997
       Updated for conical projections W. Landsman  July 2003

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