NAME:
  blurmap
 PURPOSE:   (one line only)
  Apply spherical blurring to a map
 DESCRIPTION:
 CATEGORY:
  Numerical
 CALLING SEQUENCE:
  blurmap,inmap,blurradius,outmap
 INPUTS:
  inmap - Rectangular array which contains a map of a spherical body.  The
            coordinate scheme used is documented in RENDER.PRO
  blurradius - radius of the blurring function in degrees (<90)
                 a gaussian filter is used and this is the FWHM of the filter
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  OUTSIZE - two element vector that gives the size of the output map.
              Default is the same as the input map.
 OUTPUTS:
  outmap - Output map smoothed to desired level
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Lowell Observatory, 2003/09/18