[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[netCDFJava #YHY-505756]: variable aggregation within a single dataset

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [netCDFJava #YHY-505756]: variable aggregation within a single dataset
  • Date: Tue, 13 Aug 2013 11:51:53 -0600
Ghansham,

I do not have a sample dataset with a discrete axis that I can think of 
offhand.  If you were to create a new dimension (axis) for aggregation using 
NcML, you would do it as described here:

http://www.unidata.ucar.edu/software/netcdf/ncml/v2.2/Aggregation.html#joinNew

Note that you would not be able to do this inside of a single dataset, per your 
original question.

Regards,
  Lansing

> Can you attach a sample datset or how discrete axis looks in ncml or  cdl?
> Ghansham
> 
> address@hidden> wrote:
> > Ghansham,
> >
> > As near as I might suggest, your wave number axis would probably fall
> under the description of a "discrete axis."  There is a discussion in the
> most recent CF document here:
> >
> >
> http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/cf-conventions.html#discrete-axis
> >
> > Regards,
> >   Lansing
> >
> >> Actually I dont want to go away from CF conventions. AFAIK wavenumber has
> >> not been yet accepted as a standard dimension. If I am wrong in stating
> >> that just let me know and I will go ahead to do that. I am more than
> happy
> >> doing that. It reduces the number of variable  in my file.
> >>
> >> regards
> >> Ghansham
> >>
> >>
> >> address@hidden> wrote:
> >>
> >> > Ghansham,
> >> >
> >> > I'm afraid that you will not be able to aggregate your variables as you
> >> > are describing using NcML or any of our aggregation tools.  Your best
> >> > solution is probably to rewrite the files with the wavenumber dimension
> >> > included from the start.
> >> >
> >> > Regards,
> >> >   Lansing Madry
> >> >   Unidata
> >> >   Boulder, Colorado
> >> >
> >> > > R/Sir
> >> > >
> >> > > I have mulitple variables (3-d namely time, lat, lon) within a single
> >> > > dataset, and I want to join them on fourth dimension wavenumber (to
> be
> >> > > created in the dataset). Is it  possible using NcML or any other
> solution
> >> > >
> >> > >
> >> > > Ghansham
> >> > >
> >> > >
> >> >
> >> >
> >> > Ticket Details
> >> > ===================
> >> > Ticket ID: YHY-505756
> >> > Department: Support netCDF Java
> >> > Priority: Critical
> >> > Status: Open
> >> >
> >> >
> >>
> >>
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: YHY-505756
> > Department: Support netCDF Java
> > Priority: Critical
> > Status: Open
> >
> >
> 
> 


Ticket Details
===================
Ticket ID: YHY-505756
Department: Support netCDF Java
Priority: Critical
Status: Open