Hello,
>From memory of the meeting last September, it was agreed that there should
be a defined mapping from a grouped dataset to a non-grouped (i.e.
compliant under the current conventions) dataset. Defining this mapping
forces you to decide on what sort of hierarchy is allowed when looking for
variables.
For example, when looking for a coordinate variable, should you be
restricted to looking in the parent, grandparent, etc. groups of the group
that you are in; or should you be allowed to look in sibling, cousin,
second cousin twice removed, etc. groups (
https://en.wikipedia.org/wiki/Cousin#/media/File:CousinTree.svg).
Again from memory, the former is simplest and least ambiguous, but datasets
already exist with relationships of the latter sort.
I can't remember if there was consensus on the idea of being able to re-map
from a non-grouped view to the original, grouped dataset.
All the best,
David
On 26 March 2018 at 21:23, Jim Biard <jbiard at cicsnc.org> wrote:
> Erik,
>
> Charlie's proposal is heavily oriented towards ensembles. I tend to favor
> hierarchical scoping, but every option has one sort of weakness or another.
>
> Grace and peace,
>
> Jim
>
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> On Mon, Mar 26, 2018 at 4:16 PM, Erik Quaeghebeur <
> E.R.G.Quaeghebeur at tudelft.nl> wrote:
>
>> Dear Daniel,
>>
>>
>> Charlie Zender has led the effort on a draft extension for using groups
>>> in CF, which I think is very important. You can find it here:
>>> https://docs.google.com/document/d/1KK6IZ2ZmpaUTVgrw-GlFd6al
>>> mppjvGz6D7nxVTO3BtI/edit
>>>
>>
>> Thanks, that is an interesting read. (Just skimmed the start for now.)
>>
>> [?], or at least indicate your support if they're in line with your
>>> requirements. It sounds like your setup would essentially be using an
>>> intuitive "scoping" mechanism to make higher-level metadata "visible"
>>> "from" groups lower down the tree, goes in the direction of work done so
>>> far..
>>>
>>
>> Yes this scoping approach is what I had in mind. I support that.
>>
>> The lateral search in case the referred to coordinates are not found
>> higher in the hierarchy is asking for trouble, though, IMHO. How can users
>> know the search order? It makes it dangerous to reuse names of (coordinate)
>> variables, forcing unique names throughout, negating one of the advantages
>> of a hierarchical approach: structure to order instead of overly long
>> naming conventions.
>>
>>
>>
>> Best,
>>
>> Erik
>>
>> --
>> https://ac.erikquaeghebeur.name
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>>
>
>
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--
David Hassell
National Centre for Atmospheric Science
Department of Meteorology, University of Reading,
Earley Gate, PO Box 243, Reading RG6 6BB
Tel: +44 118 378 5613
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