Ah, I see better now. Since the run dimension is being created by the
aggregation, the protoDataset won't have it available to work with. I would
try using the dataset returned by the getDataset2D method along with some
NcML to rename the run dimension by using the mergeNcMLdirect method from
the ucar.nc2.ncml.NcMLReader class:
https://www.unidata.ucar.edu/software/thredds/current/netcdf-java/javadoc/ucar/nc2/ncml/NcMLReader.html#mergeNcMLdirect-ucar.nc2.dataset.NetcdfDataset-org.jdom2.Element-
Cheers,
Sean
On Fri, Dec 22, 2017 at 7:52 AM, Harms, Clifford M CIV NAVOCEANO, N642 <
clifford.harms@xxxxxxxx> wrote:
> I'm attempting to change the dimension created by netcdf-java name from
> 'run' to 'reference_time' in the featureCollection.xml as shown below:
>
> <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
> <featureCollection xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/
> ncml-2.2"
> xmlns:ns2="http://www.unidata.ucar.edu/namespaces/thredds/
> InvCatalog/v1.0"
> path="4a76026e-1e2c-302a-bd41-e9c9ea3a47cd_fmrc"
> name="ncom_relo_autec_u_24"
> featureType="FMRC">
> <ns2:collection spec="/path/to/ncml/files/
> ncom_relo_autec_[0-9]+[.]ncml"/>
> <protoDataset>
> <netcdf>
> <dimension name="reference_time" orgName="run"/>
> </netcdf>
> </protoDataset>
> </featureCollection>
>
> It's worth mentioning that the collection spec references .ncml files that
> contain joinExisting aggregations of .nc files. None of these files have a
> 'run' dimension, I assume that netcdf-java is creating this from the time
> dimension metadata.
>
> I also am not using the THREDDS server directly, but obtaining a
> NetcdfDataset from the featureCollection.xml as shown here (in java):
>
> Formatter formatter = new Formatter(System.err);
> FeatureCollectionConfigBuilder builder = new FeatureCollectionConfigBuilder
> (formatter);
> FeatureCollectionConfig config = builder.readConfigFromFile(
> featureCollectionPath.toString());
> Fmrc fmrc = Fmrc.open(config, formatter);
> NetcdfDataset result = new NetcdfDataset();
> fmrc.getDataset2D(result);
>
>
> -----Original Message-----
> From: Sean Arms [mailto:sarms@xxxxxxxx]
> Sent: Thursday, December 21, 2017 6:38 PM
> To: Harms, Clifford M CIV NAVOCEANO, N642
> Cc: netcdfgroup@xxxxxxxxxxxxxxxx
> Subject: [Non-DoD Source] Re: [netcdfgroup] Renaming FMRC 'run' dimension
>
> Greetings!
>
> You should be able to use NcML inside the protoDataset element to rename
> the dimension and/or variable. Could you send an example of the
> featureCollection xml you are using?
>
> Thanks!
>
> Sean
>
> On Thu, Dec 21, 2017 at 4:36 PM Harms, Clifford M CIV NAVOCEANO, N642 <
> clifford.harms@xxxxxxxx> wrote:
>
>
> Currently, I use FMRC via featureCollection XML files to aggregate
> datasets with different runtimes (these datasets are themselves NCML
> aggregations of .nc files). When opening such a featureCollection in java,
> I get a dataset that that has dimension variable named 'run' for the
> different run times, and everything works beautifully. I need to be able
> to change the name of this 'run' dimension to something else in order to
> retain compatibility with some customers. Reading FMRC documentation leads
> me to believe that using a dimension element in the prototypeDataset
> element of the collection should rename the dimension, but it does not.
>
> What is the correct way to change the name of the model run time
> dimension in a FMRC?
>
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