Re: [thredds] netcdf files (.nc) with data in them compressed with bzip2

• To: Artak Zakaryan <artak.zakaryan@xxxxxxxxxxxxxxx>
• Subject: Re: [thredds] netcdf files (.nc) with data in them compressed with bzip2
• From: "Antonio S. Cofino" <cofinoa@xxxxxxxxx>
• Date: Tue, 2 Sep 2025 00:06:11 +0200

Hi Artak,

If you access a .nc.bz2 file through the HTTP File Service, TDS will just
serve the compressed file as is.

If you use data access services like OPeNDAP or the NetCDF Subset Service,
netCDF Java will first decompress the .bz2 on the server and then serve the
uncompressed dataset.

Note that this is different from the internal compression available in
NetCDF-4/HDF5 files (for example deflate/zlib), which is handled
transparently and does not require any server side decompression step.

Regards,

Antonio

On Mon, 1 Sept 2025, 09:02 Artak Zakaryan, <artak.zakaryan@xxxxxxxxxxxxxxx>
wrote:

> Hello THREDDS Team,
>
>
>
> Can someone please advise if THREDDS server supports netcdf files (.nc)
> with data in them compressed with bzip2?
>
> The files in question are .nc files but the data in the files is
> compressed with bzip2. I have done some research, and it looks like THREDDS
> supports .bzip2 files but could not find any information about .nc files
> with data in them compressed with bzip2.
>
>
>
> Thank you.
>
>
>
> Artak
>
>
>
>
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• References:
  • [thredds] netcdf files (.nc) with data in them compressed with bzip2
    • From: Artak Zakaryan