Re: [netcdfgroup] Fast interconversion between netCDF4 and netCDF-classic

• To: netcdfgroup@xxxxxxxxxxxxxxxx
• Subject: Re: [netcdfgroup] Fast interconversion between netCDF4 and netCDF-classic
• From: Dave Allured - NOAA Affiliate <dave.allured@xxxxxxxx>
• Date: Tue, 17 Feb 2015 19:55:40 -0700

Aidan,

NetCDF4 and netCDF4 Classic, actually *all* of the format variations, are
intended to present a uniform and seamless interface to the user, unless
advanced features are used.  I am curious about your reasons for wanting to
convert.  I wonder whether you have run into the same issues I have hit,
application software that changes behavior in a format sensitive way when
reading.

Sorry to distract from your real question.

--Dave


On Tue, Feb 17, 2015 at 5:58 PM, Aidan Heerdegen <aidan.heerdegen@xxxxxxxxxx
> wrote:

> Hi,
>
> We've got a LOT of data in netCDF4 format that we think, for a few reasons,
> we would probably like in netCDF4 Classic Model format.
>
> The data itself does not require any of the added features of netCDF4.
>
> Converting it all with nccopy would take a very very long time. I have a
> suspicion that under the hood there will be very little different between
> the files. I've done a test with a 400Mb test file, there are only 168
> bytes
> different between the netcdf4 and netcdf4-classic versions of the data.
>
> Is there a smart/fast/safe way to convert netCDF4 data "in-place" to
> netCDF4-classic?
>
> Thanks
>
> Aidan
>

• References:
  • [netcdfgroup] Fast interconversion between netCDF4 and netCDF-classic
    • From: Aidan Heerdegen