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

Re: NCML aggregation and variableAgg

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 Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated.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: Re: NCML aggregation and variableAgg
  • Date: Tue, 3 Oct 2006 12:14:48 +0100
Hi John,

I see your point about coordinate variables.  However it would be nice
to be able to say "aggregate over all non-coordinate variable".
Unless there's something I'm missing, I would have thought that this
was a very common case.

Thanks, Jon

On 03/10/06, John Caron <address@hidden> wrote:

Hi Jon:

How do you distinguish between variables that should be aggregated and
those that shouldnt? for example, often adding a time dimension to the
coordinate variables screws things up for some software.

address@hidden wrote:

>Hi all,
>
>I'm creating aggregations of NetCDF files by aggregating on a new time
>dimension, whose values come from the names of the files.  My .ncml file looks
>like this:
>
><netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
>  <aggregation dimName="time" type="joinNew">
>    <variableAgg name="ICEC"/>
>    <variableAgg name="ICETK"/>
>    <variableAgg name="M"/>
>    <variableAgg name="...etc"/>
>    <scan location="C:/data/FOAM_one/" suffix=".nc"
>dateFormatMark="FOAM_#yyyyMMdd.HH" />
>  </aggregation>
></netcdf>
>
>It's a bit tedious to have to specify explicitly all the variables I want to
>aggregate.  I want to aggregate all variables so I would like to be able to
>have:
>
><netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
>  <aggregation dimName="time" type="joinNew">
>    <variableAgg name="*"/>
>    <scan location="C:/data/FOAM_one/" suffix=".nc"
>dateFormatMark="FOAM_#yyyyMMdd.HH" />
>  </aggregation>
></netcdf>
>
>or something like that.  Is this possible?  If I try that, no variables get
>aggregated (when I open a GridDataset, there is no time dimension).
>
>Thanks in advance,
>Jon
>