Mark,
I don't think there is any real need for a number_of_realizations
attribute or standard name. The size of the dimension associated with
the coordinate variable associated with the 'realization' standard name
provides the number of realizations. If the coordinate variable with
this standard name is a scalar, then the number is, by implication, one.
Here are a couple of examples:
1)
dimensions:
realize = 3;
strlen = 50;
lat = 720;
lon = 1440;
variables:
float meas(realize, lat, lon);
...
lat(lat);
...
lon(lon);
...
char realize(realize, strlen);
standard_name = "realization";
2)
dimensions:
strlen = 50;
lat = 720;
lon = 1440;
variables:
float meas(lat, lon);
coordinates = "realize";
...
lat(lat);
...
lon(lon);
...
char realize(strlen);
standard_name = "realization";
Grace and peace,
Jim
On 10/3/14, 6:52 AM, Hedley, Mark wrote:
> Hello CF
>
> The standard name
> realization
> is available for use:
> Realization is used to label a dimension that can be thought of asa
> statistical sample, e.g., labelling members of a model ensemble.
>
> It is common practice in forecasting and some forecasting formats to
> explicitly state the number of members an ensemble contained.
>
> This would be generally be expected to be a single value across an
> ensemble collection. As such I am not sure that a standard name and a
> coordinate would be the most useful way to encode this piece of
> information.
>
> Thus, we could look to provide a new data variable attribute,
> something like
> number_of_realizations
> to store this metadata.
>
> However it is not impossible for this to vary across some coherent
> data set so perhaps a standard_name of
> number_of_realizations
> would be a sensible approach, even if in most cases this would be a
> scalar coordinate
>
> Please may I ask for some opinions on this matter?
>
> thank you
> mark
>
>
> _______________________________________________
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> CF-metadata at cgd.ucar.edu
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--
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Received on Fri Oct 03 2014 - 08:30:52 BST
