NCML aggregation and variableAgg

[Ethan Davis]

Hi Jon,

I don't see anything in the docs or the code to suggest that there is a 
wildcard capability (or any other kind of shortcut) for declaring 
aggregation variable names.

The docs say this about "joinNew":

    A JoinNew dataset is constructed by transferring objects
    (dimensions, attributes, groups, and variables) from the nested
    datasets in the order the nested datasets are listed. All variables
    that are listed as aggregation variables are logically concatenated
    along a new dimension, in the order of the nested datasets. A
    coordinate Variable is created for the new dimension.
    Non-aggregation variables are treated as in a Union dataset, i.e.
    skipped if one of that name already exists.

which seems to explain why you don't get any aggregation or time 
dimension with your wildcard example. Sounds like you might just be 
getting the first dataset it finds.


Ethan

jdb at mail.nerc-essc.ac.uk 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
>   

-- 
Ethan R. Davis                                Telephone: (303) 497-8155
Software Engineer                             Fax:       (303) 497-8690
UCAR Unidata Program Center                   E-mail:    edavis at ucar.edu
P.O. Box 3000
Boulder, CO  80307-3000                       http://www.unidata.ucar.edu/
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