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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Markus,
Both NcML and FeatureCollections have the concept of a "prototype dataset"
[1][2]. It is the dataset from which metadata for the aggregation is taken.
To answer your question, here is a snippet from the FeatureCollections
page, which also applies to NcML aggregation:
The choice of the protoDataset matters when the datasets are not homogenous:
* Global and variable attributes are taken from the prototype dataset.
* If a variable appears in the prototype dataset, it will appear in the
feature collection dataset. If it doesnt appear in other datasets, it will
have missing data for those times.
* If a variable does not appears in the prototype dataset, it will not
appear in the feature collection dataset, even if it appears in other
datasets.
Cheers,
Christian
[1]
http://www.unidata.ucar.edu/software/thredds/current/tds/reference/ThreddsConfigXMLFile.html#Aggregation
[2]
http://www.unidata.ucar.edu/software/thredds/current/tds/reference/collections/FeatureCollections.html
(scroll down to the "protoDataset element" section)
On Mon, Jul 27, 2015 at 3:40 AM, Markus Fiebig <Markus.Fiebig@xxxxxxx>
wrote:
> Dear list members,
>
> a question from someone considering to set up his own THREDDS server:
>
> THREDDS has its own built-in subset service that can make cut-outs from
> its data
> repository going over several original netCDF files and arranging them
> into one
> netCDF file. Let's say that all these original netCDF files conform in all
> co-ordinates etc. such that the subsetting is possible, but that they
> differ in
> certain global attributes. How would the subset service handle this case?
> Would
> it include all the various global attributes correctly with the various
> pertaining data, or would it just discard the global attributes since they
> are
> not homogeneous over the selected data subset?
>
> Best regards,
> Markus
>
> --
> Dr. Markus Fiebig
> Senior Scientist
> Dept. Atmospheric and Climate Research (ATMOS)
> Norwegian Institute for Air Research (NILU)
> P.O. Box 100
> N-2027 Kjeller
> Norway
>
> Tel.: +47 6389-8235
> Fax : +47 6389-8050
> e-mail: Markus.Fiebig@xxxxxxx
> skype: markus.fiebig
>
> P Please consider the environment before printing this email and
> attachments
>
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