On 1/17/2014 9:03 AM, Farrukh Najmi wrote:
Hi Guys,
I am learning the netcdf-java API. My reference point is the following
diagram and related resources:
http://www.unidata.ucar.edu/software/netcdf/workshops/2010/netcdf4/Nc4DataModel.html
the above is the netcdf-4 data model.
the cdm data model is slightly different:
http://www.unidata.ucar.edu/software/thredds/v4.4/netcdf-java/CDM/
I understand that variable, dimension and attribute may be defined
within a parent group and be inherited by child groups and referenced
within the definition of data and variables in that group or a child
group. Do I have this right? Whats a good reference to understand the
inheritance semantics of variable, dimension and attribute definitions
within groups?
the only thing that is formally inherited is a dimension.
To provide some context, I am working on a specification to catalog
NetCDF data files into an ebXML RegRep server and a Context Query
Language (CQL) context set for querying such a NetCDF using CQL.
The cataloging process needs to harvest metadata about the NetCDF file
and its groups, variable, dimension and attribute. This requires
having some way to reference groups, variable, dimension and attribute
using a unique id. There does not seem to be anything resembling a
UUID in NetCDF. Would the FullName be the unique id within the scope
of the NetCDF file?
yes.
Is there a need for a globally unique id for groups, variable,
dimension and attribute (perhaps generated using file url as scope)?
i dont know, not sure how you intend to use the registry. names are
generally not standardized, so their meaning is not obvious. CF
Convention standard names are one attempt to clarify meaning. hopefully
the registry is used on some set of datasets that you understand
Please let me know if my questions are not clear. Thank you.
--
Regards,
Farrukh Najmi
Web:http://www.wellfleetsoftware.com
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