[CF-metadata] can a cell method be an attribute of an auxiliary coordinate variable ?

From: Jonathan Gregory <j.m.gregory>
Date: Wed, 5 Mar 2014 09:00:09 +0000

Dear Jim

> We are attempting to follow section 9. The centroid of the weather system is calculated at each time step, and we are planning to use the longitude and latitude calculated as the coordinates of the system. So, for example, would the variables below be OK? (I?ve left out time and numerous other variables.)
>
> float lat(trajectory, obs)
> :standard_name = ?latitude?
> :axis = ?Y?
> :cell_methods = ?latitude:mean (over system)?
>
> float lon(trajectory, obs)
> :standard_name = ?longitude?
> :axis = ?X?
> :cell_methods = ?longitude:mean (over system)?
>
> float maxlat(trajectory, obs)
> :cell_methods = ?latitude:maximum (over system)"
>
> float mtpwv(trajectory, obs)
> :long_name = ?mean total precipitable water vapor?
> :cell_methods = ?area:mean (over system)?

I think the approach is OK but I would suggest for latitude and longitude
"area: mean (over system)" and for maxlat "area: maximum (over system)". These
indicate statistics of lat and lon which are calculated from the variation over
the area of the system. Is that what you intend? The cell_methods is a blank-
separated list of words, so there's a space after ":".

Cheers

Jonathan
Received on Wed Mar 05 2014 - 02:00:09 GMT