Re: grid_number in netCDF file

• To: Tom Whittaker <tomw@xxxxxxxxxxxxx>
• Subject: Re: grid_number in netCDF file
• From: Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>
• Date: Mon, 5 Apr 1999 12:43:14 -0600 (MDT)

On Mon, 5 Apr 1999, Tom Whittaker wrote:

Hi Robb:

Don suggested I send this along to you.

He had kindly sent me a netCDF file with ruc2 data in it so I
could test an application I'm writing.  When I opened the file,
my code failed when trying to reference the "grid_number".  What
I found was the file defined:

 int grid_number(nav, ngrids) ;
   grid_number:long_name = "GRIB-1 catalogued grid numbers" ;
   grid_number:_FillValue = -9999 ;

where "ngrids" dimension is two.  What's strange is that 'ngrids'
doesn't seem to appear anywhere else in the CDL.

Tom,

ngrids is a dimension only, the grid_number should be at the bottom of the
cdl file:

grid_number = 236, 255 ;

I  attached  ruc2.cdl in case your copy was somehow corrupted.  I used
ncdump on a ruc2.nc file today and located grid_number ok, maybe the file
Don sent was corrupted.  This happens once in a while when there is no
disk space to write the ruc2.nc file.  These files are large:
48478444 Apr  5 12:42 99040518_ruc2.nc


Robb...

I wondered what the story was with this, and what I needed to be
prepared for in my application...it almost looks like two
different grid formats/types might appear in one netCDF file?  Or
am I missing something else?

Words of wisdom appreciated...thanks...

tom

--
Tom Whittaker (tomw@xxxxxxxxxxxxx)
University of Wisconsin-Madison
Space Science and Engineering Center
Phone/VoiceMail: 608/262-2759
Fax: 608/263-6738

==============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx                   WWW: http://www.unidata.ucar.edu/
==============================================================================

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