Re: [netcdf-java] [thredds] Ensemble data not possible to visualize

Heiko,

Moreover....

The netcdf-java 4.6.X recognizes the standard_name='ensemble' for Ensembles Axis Type.

https://github.com/Unidata/thredds/blob/master/cdm/src/main/java/ucar/nc2/dataset/conv/CF1Convention.java#L157-L160

but 'ensemble' is not a recognized CF standard_name. It should be 'realization' as you have put into the ensemble_member

The netcdf-java 5.0.0, adds 'realization' as possible standard_name value for Ensembles Axis Type

https://github.com/Unidata/thredds/blob/5.0.0/cdm/src/main/java/ucar/nc2/dataset/conv/CF1Convention.java#L162-L165

Regards

Antonio


On 06/12/16 13:55, Heiko Klein wrote:
Hi,

we just extended our meteorology forecast runs with ensemble members.

Data without ensemble/realization dimension can be found here:
http://thredds.met.no/thredds/dodsC/arome25/arome_metcoop_test2_5km_latest.nc
and these work well with the netcdf-java base software like
thredds/idv/ncwms , e.g. precipitation_amount_acc(time,height0,y,x)

As soon as we combine several realizations/ensembles into the same file
http://thredds.met.no/thredds/dodsC/meps25files/meps_allmembers_full_2_5km_latest.nc
all gridded feature stop working for
precipitation_amount_acc(time,height0,ensemble_member,y,x). We can still
use opendap, but ncwms and idv no longer find this variable.
netcdf-tools still detect the variable as a FeatureType GRID
f:D(5)->R(7) (in FeatureType->FeatureScan) but is not able to detect the
coordinateSystem in FeatureType->Grids.

I even tried to remove the height0 dimension (which is of size 1), but
without any change.


Is 'standard_name=realization' an unsupported feature of netcdf-java?
There was a longer discussion about it in 2010:
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2010/053546.html
Should we use some axis="ensemble" or _CoordinateAxis keyword to help
detect the ensemble dimension?

Or is the problem within thredds/ncwms/idv not able to deal with other
dimensions than x,y,z,t?

Sorry for cross-posting, not really sure where the problem lies. We're
using thredds 4.6 and netcdf-java toolsUI 4.6

Best regards,

Heiko





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