Re: [idvusers] IDV Jython, Append to Netcdf?

• To: Paul Graham <meteorpaul@xxxxxxxxx>
• Subject: Re: [idvusers] IDV Jython, Append to Netcdf?
• From: Tom Whittaker <whittaker@xxxxxxxx>
• Date: Mon, 15 Apr 2013 09:42:24 -0500

If you want to use these data in another run of the IDV, perhaps you could
use NCO to combine the files into a single one.  This would give you the
flexibility to create a "combined file" from several IDV runs as well.  See:
<http://nco.sourceforge.net/nco.html#Appending-Variables>

tom



On Fri, Apr 12, 2013 at 6:54 PM, Paul Graham <meteorpaul@xxxxxxxxx> wrote:

> Hi Julien,
>
> Why I'm doing this is ultimately to speed up IDV by writing out to file
> some derived fields, such as Isentropic Potential Vorticity, which take a
> long time to calculate each time they are loaded. It would be nice to have
> these fields in the same Netcdf rather than separate files for each field
> (which is what happens using the 'exportGridToNetcdf' method).
>
> Thanks,
>
> Paul
>
> On 13 April 2013 08:09, Julien Chastang <chastang@xxxxxxxx> wrote:
>
> > Paul,
> >
> > Rooting around GridUtil (https://www.unidata.ucar.edu/**
> > software/metapps/docs/javadoc/**ucar/unidata/data/grid/**GridUtil.html<
> https://www.unidata.ucar.edu/software/metapps/docs/javadoc/ucar/unidata/data/grid/GridUtil.html
> >),
> > I don't see any obvious function for appending or concatenating two grids
> > together. Plus, what does it mean to have multiple grids written to one
> > netCDF file? I suspect you have to do it this the hard way by building a
> > new FieldImpl with the grids in question and how you want them organized.
> > Someone may know better than me. :-)
> >
> > Best,
> >
> > Unidata IDV Support
> >
> >
> >
> > On 4/12/13 1:58 AM, Paul Graham wrote:
> >
> >> Hi IDV'ers,
> >>
> >> I'm using the 'exportGridToNetcdf' method to write a grid to a Netcdf
> >> file,
> >> eg.
> >>
> >>    exportGridToNetcdf(outField, "out.nc")
> >>
> >> but I have more than one grid I want to write to the file.  Is there a
> way
> >> I can use this method or is there another method I can use?  For
> example,
> >> can I append to a Netcdf file?
> >>
> >> Thanks in advance,
> >>
> >> Paul
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-- 
Tom Whittaker
University of Wisconsin-Madison
Space Science & Engineering Center (SSEC)
Cooperative Institute for Meteorological Satellite Studies (CIMSS)
1225 W. Dayton Street
Madison, WI  53706  USA
ph: +1 608 262 2759

• References:
  • [idvusers] IDV Jython, Append to Netcdf?
    • From: Paul Graham
  • Re: [idvusers] IDV Jython, Append to Netcdf?
    • From: Julien Chastang
  • Re: [idvusers] IDV Jython, Append to Netcdf?
    • From: Paul Graham