QDCB_GRID

       Produce an overlay of latitude and longitude lines over a plot or image

       Grid is plotted on the current graphics device assuming that the
       current plot is a map  in the so called quad cube projection. The
       output plot range is assumed to go from 7.0 to -1.0 on the X axis and
       -3.0 to 3.0 on the Y axis. Within this plotting space, the quad cube
       faces are laid out as follows (X=Empty, Astronomical Layout shown -
       X axis can be swapped for geographic maps):
           3.0_
               XXX0
               4321
          -3.0_XXX5
               |  |
             7.0  -1.0

       Mapping Support Routine

       QDCB_GRID,[,DLONG,DLAT,[LINESTYLE=N,/LABELS]

       DLONG   = Optional input longitude line spacing in degrees. If left
                 out, defaults to 30.
       DLAT    = Optional input lattitude line spacing in degrees. If left
                 out, defaults to 30.

       LINESTYLE       = Optional input integer specifying the linestyle to
                         use for drawing the grid lines.
       LABELS          = Optional keyword specifying that the lattitude and
                         longitude lines on the prime meridian and the
                         equator should be labeled in degrees. If LABELS is
                         given a value of 2, i.e. LABELS=2, then the longitude
                         labels will be in hours and minutes instead of
                         degrees.

       NONE

       Uses WCSSPH2XY.PRO with projection 23 ("QSC" - COBE Quadrilatieralized
       Spherical Cube) to compute positions of grid lines and labels.

       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.

       Jeff Bloch

       %I%     %G%
       Use WCSSPH2XY instead of QDCB   Wayne Landsman   December 1994
       Converted to IDL V5.0   W. Landsman   September 1997

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