[CF-metadata] FW: realization | x of n

From: Jonathan Gregory <j.m.gregory>
Date: Tue, 7 Oct 2014 15:31:41 +0100

Dear Mark

> This is an explicit piece of metadata which is provided by some systems and models and is applied to the ensemble collection, rather than statistics derived from that collection.
>
> In most cases there will be no CellMethod but there will be a realization dimension and coordinate.
>
> This piece of metadata could be considered to be:
> 'The expected length of the realization coordinate and dimension, if the whole ensemble collection is present.'
>
> This is preserved during subset operations, so that I may be looking one ensemble member, with a realization coordinate value of 4, but I know that this is from an ensemble of 17 members.
>
> This is useful metadata which is available from some models and we would like to preserve it in a standardised way in our CF NetCDF data sets.

Do you mean "The expected length of the realization coordinate and dimension,
if the whole ensemble *was* present"? I mean, is the whole ensemble present
or not? I'm sorry, I'm not clear what you mean still.

If the whole ensemble *is* present, then isn't the number of ensemble members
equal to the size of the ensemble dimension, as Jim said?

Cheers

Jonathan
Received on Tue Oct 07 2014 - 08:31:41 BST