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  Utility routine to find the map projection grid boundary from a file,
  if it is possible to do so. Currently works with GeoTIFF files, CF 1.4
  compliant netCDF files, and GPD files created with the GPD_Viewer software
  from the Catatlyst Library.




    The return value is either a 1, indicating a boundary can be found, or a 0 indicating
    that the boundary could not be found.


    filename: in, required, type='string'
      The name of a filename to open to see if a projected map grid boundary can be found.
    boundary: out, optional, type=float
      The boundary of the image in projected meter space, in the form [x0,y0,x1,y1].


    use_latlon: in, optional, type=boolean, default=0
        If the filename is a netCDF file, set this keyword to force the boundary
        to be determined by reading the include latitude/longitude arrays.
    utm_south: in, optional, type=boolean, default=0
        Set this keyword to add 10e6 to each of the Y values. This is sometimes
        necessary with LandSat images in the Southern hemisphere, where the Y values
        are given in negative values to indicate southern UTM zones.
    xrange: out, optional, type=float
        A two element vector: boundary[[0,2]]
    yrange: out, optional, type=float
        A two element vector: boundary[[1,3]]


      David W. Fanning
      1645 Sheely Drive
      Fort Collins, CO 80526 USA
      Phone: 970-221-0438
      E-mail: david@idlcoyote.com
      Coyote's Guide to IDL Programming: http://www.idlcoyote.com


    Written by: David W. Fanning, 23 February 2010.::
      Added XRANGE and YRANGE keywords. 25 February 2010. DWF
      Added USE_LATLON keyword for finding boundary of netCDF files containing latitude
          and longitude arrays. 6 April 2010. DWF.
      Added UTM_SOUTH keyword to handle Landsat dat in UTM projections in GeoTiff files
          that have to have 10e6 added to Y values to make them work in IDL. 14 Aug 2012. DWF.
      Renamed cgFindMapBoundary from FindMapBoundary. 21 Aug 2012. DWF.
      Changed reference to NCDF_Coord to cgNCDFMap. 28 Oct 2012. DWF.


    Copyright (c) 2012, Fanning Software Consulting, Inc.

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