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  The purpose of this function is to translate map projection information
  found in a netCDF file into a map coordinate object (cgMap) that can be
  used to georeference images with a map data coordinate system. The Coyote
  Library is required.


    Graphics, Map Projections


    To create a map coordinate from a netCDF file from NSIDC::
      file = 'C:\IDL\data\netCDF\jun_2004_amsr_e_bt.nc'
      mapCoord = cgNCDFMap(file, /Continents, /Grid)


      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/
    It is not possible to have a one-to-one mapping between every netCDF file and a map projection
    in IDL, since IDL has a limited number of map projections and datums available. And, even at that,
    I have not implemented all of IDL's map projections or datums, only those that I thought were most
    likely to be encountered in my own work. If you run into a netCDF file that does not work in this
    code (either because of an error in the code or because it is not supported), please contact me.
    I am interested in supporting as many netCDF files as possible and I will take pains to do so if
    I know they are needed.


    Converted from old ncdf_Coord program in Catalyst Library to run with Coyote Graphics routines.
        9 November 2011. David W. Fanning.


    Copyright (c) 2011, Fanning Software Consulting, Inc.

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