[CF-metadata] Ocean CTD data following CF Conventions v1.6

Karl Taylor taylor13 at llnl.gov
Tue Apr 3 09:39:15 MDT 2012

Dear all,

I second Jonathan's suggestion to treat lon, lat, and time as scalars 
pointed to by the coordinates attribute, and to only keep "pressure" as 
a true coordinate.  It seems neater to me.  In CMIP5, we've required all 
size-1 dimensions of this kind be treated in this way.


On 4/3/12 7:47 AM, Jonathan Gregory wrote:
> Dear Andrew and Nan
>> If your pressure isn't monotonic, and so can't be a coordinate
>> variable, I don't know
>> whether it's preferable to demote ALL the coordinates to auxiliary
>> coordinate variable
>> status,
> I don't think there's a recommendation to treat the coordinates in the same
> way. If size-1 coordinates are listed in the coordinates attribute, it is also
> permissible to make them scalar variables and not define the size-1 dimension.
> These are CF scalar coordinate variables. e.g.
>    float lon;
>    float lat;
>    float time;
>    float temperature(pressure);
>      coordinates="lat lon time";
> where all the variables should have units and standard_names as usual. It
> doesn't matter what order is used for the coordinates attribute. Note that
> it's a blank-separated list (not comma-separated).
> Best wishes
> Jonathan
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