Re: [netcdfgroup] how to tell if a hdf5 is netcdf

• To: Upendra Dadi <Upendra.Dadi@xxxxxxxx>
• Subject: Re: [netcdfgroup] how to tell if a hdf5 is netcdf
• From: Russ Rew <russ@xxxxxxxxxxxxxxxx>
• Date: Fri, 22 Oct 2010 12:47:51 -0600

Upendra,

>   Thank you! Is there anything in the file itself to tell that it is 
> netcdf4? How does ncdump know that it is netcdf4?
> Upendra

The function nc_inq_format, documented here:

  http://www.unidata.ucar.edu/netcdf/docs/netcdf-c.html#nc_005finq-Family

returns a value indicating the netCDF format variant of the file.

Also if you use 

  ncdump -s filename

the output includes a virtual global attribute, "_Format", that
specifies what type the file is.  The "-s" option is intended to 

  ... provide performance-related information about the file format and
  variable properties for netCDF-4 data.  These special virtual
  attributes are not actually part of the data, they are merely a
  convenient way to display miscellaneous properties of the data in CDL
  (and eventually NcML).  They include `_ChunkSizes', `_DeflateLevel',
  `_Endianness', `_Fletcher32', `_Format', `_NoFill', `_Shuffle', and
  `_Storage'.

--Russ
 
> Ted Mansell wrote:
> > You can try
> >
> > ncdump -k [filename]
> >
> > -- Ted
> >
> > On Oct 22, 2010, at 9:48 AM, Upendra Dadi wrote:
> >
> >> Hi,
> >> How to tell if a given hdf5 file is netcdf 4 other than the file 
> >> extension? I opened a netcdf4 file in HDFView looking for metadata 
> >> which tells that the file is netcdf 4. I couldn't locate one.
> >>
> >> Related problem, would it be possible to create a netcdf 4 using 
> >> HDFView? Any help is appreciated.
> >>
> >> Upendra
> >>
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> 
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• References:
  • Re: [netcdfgroup] how to tell if a hdf5 is netcdf
    • From: Upendra Dadi