NCML aggregation and variableAgg

[John Caron]

Its hard to do this in a general way, many files do not use the coordinate variable convention (variable name same as the dimension name). Can you give me some use cases about what exactly would work for your situation, perhaps with some example files?

Jon Blower wrote:
> 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 <caron at unidata.ucar.edu> 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.
>>
>> 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
>> >
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>>
>>
> 
> 

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