Re: [thredds] Using the NC4 String type for a variable containing a "cf_role" attribute

[John Caron <caron@xxxxxxxxxxxxxxxx>]

strictly speaking yes, but if thats not of paramount concern, the 
community needs to try out new technology and standard ways of doing 
things; that is, we have to lead CF, not the other way around.

On 12/16/2013 8:53 AM, Signell, Richard wrote:
> John,
>
> Even though you will modify NJ to handle this, you are saying: If 
> producers want to deliver CF-compliant data, they should be not be 
> writing string variables.
>
> Right?
>
> Thanks,
> Rich
>
>
> On Mon, Dec 16, 2013 at 9:52 AM, John Caron <caron@xxxxxxxxxxxxxxxx 
> <mailto:caron@xxxxxxxxxxxxxxxx>> wrote:
>
>     On 12/12/2013 1:27 PM, Kyle Wilcox wrote:
> >     I have two files where the only difference is the variable type
> >     of the "feature_type_instance" variable.
> >
> >     When using a Char array, it works just fine.
> >     When using a String, NCJ fails to find a StructureRecord:
> >
> >     java.lang.IllegalStateException: Cant find Structure record
> >     Â  Â  at
> >     ucar.nc2.ft.point.standard.Table$TableStructure.<init>(Table.java:253)
> >     Â  Â  at ucar.nc2.ft.point.standard.Table.factory(Table.java:110)
> >     Â  Â  at
> >     ucar.nc2.ft.point.standard.NestedTable.<init>(NestedTable.java:98)
> >     Â  Â  at
> >     ucar.nc2.ft.point.standard.TableAnalyzer.analyze(TableAnalyzer.java:406)
> >     Â  Â  at
> >     ucar.nc2.ft.point.standard.TableAnalyzer.factory(TableAnalyzer.java:294)
> >     Â  Â  at
> >     
> > ucar.nc2.ft.point.standard.PointDatasetStandardFactory.isMine(PointDatasetStandardFactory.java:114)
> >     Â  Â  at
> >     
> > ucar.nc2.ft.FeatureDatasetFactoryManager.wrap(FeatureDatasetFactoryManager.java:272)
> >     Â  Â  at
> >     
> > ucar.nc2.ft.FeatureDatasetFactoryManager.open(FeatureDatasetFactoryManager.java:243)
> >
> >
> >
> >     You can try loading each file into the FeatureTypes/PointFeature
> >     tab to see the stacktrace from the String file (I've attached them).
> >
> >     Based on CF docs
> >     
> > (http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/cf-conventions.html#coordinates-metadata)
> >     it states:
> >     "The variable carrying the cf_role attribute may have any data type."
> >
> >
> >     Is this a bug in NCJ?
> >
> >     Thanks,
> >     Kyle
> >
> >
> >     _______________________________________________
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>
>     Hi Kyle:
>
>     CF only deals with classic netcdf data model, which doesnt have
>     Strings. However, the CDM deals with the extended model wherever
>     possible, so yes, i think this is a bug and we'll get it fixed.
>
>     John
>
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>
>
> --
> Dr. Richard P. Signell   (508) 457-2229
> USGS, 384 Woods Hole Rd.
> Woods Hole, MA 02543-1598