[CF-metadata] Representing statistics in CF

Jim Biard jbiard at cicsnc.org
Fri Apr 28 08:26:11 MDT 2017


This is something I have also found confusing in the past. It's 
unfortunate that we have a system in which you must dig through multiple 
attributes to figure out the type/kind/class of measurement you are 
dealing with, but this is how CF grew.

Grace and peace,


On 4/24/17 12:17 PM, Jonathan Gregory wrote:
> Dear Jon
>> 2. Representing the variability of a quantity within a time period (e.g. expressing the annual mean plus a measure of the spread of values around the mean).
>> I assume that (2) is solved by using cell methods on the time axis (e.g. cell_methods = “t: mean” or “t: standard_deviation” etc). Please correct me if I’m wrong!
> Quite right. The time period is recorded using bounds of the time coord var.
>> 1. Representing the mean and spread of an ensemble of simulations (i.e. boiling down a set of ensemble members to two variables: mean and spread).
>> For (1) should I use a standard name modifier? If so, is there a reason why “mean” and “standard deviation” are not listed as standard name modifiers? “Standard error” is listed, but this is different from standard deviation, and I think that what I will need is probably a standard deviation.
> You can do this with cell_methods in exactly the same way, "e: mean" and
> "e: standard_deviation" where e is the ensemble dimension. If you don't have
> an ensemble dimension, you could put "realization: mean" and
> "realization: standard_deviation", since "realization" is a standard_name
> for ensemble member designators.
> Best wishes
> Jonathan
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