[CF-metadata] Query on multiple variables with same standard names

From: olivier lauret <olauret>
Date: Tue, 2 Jun 2009 17:05:01 +0200

Hi Helen,

 

I guess you are using Jason-2 altimetry products, I've been involved in the CF definition of this. I confirm what Jonathan said: the idea was to introduce standard names only for geophysical quantities, and then distinguish them by combining standard name attribute and another appropriate attribute, such as the 'source' one - that is already provided in the dataset.

In the example you gave about wet tropospheric correction that is coming either from radiometer or model, the standard name is unique: it is 'altimeter_range_correction_due_to_wet_troposphere' and stored in the CF online standard name table. Then only the source attribute is different: one informs you that it is coming from AMR (observed one), the other one tells you that is from ECMWF (model one). Note that the long name attribute is also very useful in this dataset to detail the information.

 

 

Best regards,

 

Olivier

 

         

          
 

Olivier LAURET

Project Engineer

Space Oceanography Division

8-10 rue Hermes, 31520 Ramonville St.Agne

France

Tel. (+33) (0) 561 39 48 51

Fax:(+33) (0) 561 39 47 80

 

          
          http://www.cls.fr <http://www.cls.fr/>
http://www.aviso.oceanobs.com/ <http://www.aviso.oceanobs.com/>

http://www.esdi-humboldt.eu/home <http://www.esdi-humboldt.eu/home>

http://www.seadatanet.org/ <http://www.seadatanet.org/>

netCDF Climate and Forecast <http://cf-pcmdi.llnl.gov/>

 

 

                                

 

 

 

-----Message d'origine-----
De : cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-bounces at cgd.ucar.edu] De la part de Jonathan Gregory
Envoy? : mardi 2 juin 2009 16:49
? : cf-metadata at cgd.ucar.edu
Objet : [CF-metadata] Query on multiple variables with same standard names

 

Dear Helen

 

> - is it permissible to have more than one variable in a CF compliant

> file with the same standard name?

 

Yes, it is permissible, but you may indeed include other metadata to

distinguish them. For instance, you could use a "source" attribute of the

data variable to distinguish between model and measurement (CF 2.6.2), and

you could add a scalar coordinate variable of radiation_wavelength or

radiation_frequency (recently proposed, but not in the standard name table

yet) to distinguish the radar frequencies. If you don't need to distinguish

in a standardised way, you could use the long_name attribute to do it

descriptively. The spatial resolution will be clear from the spatial

coordinate variables.

 

Best wishes

 

Jonathan

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Received on Tue Jun 02 2009 - 09:05:01 BST