Everyone,
The UDUNITS packages (both UDUNITS and UDUNITS-2) interpret the empty
string (i.e., "") as the dimensionless unit 1 -- so if you can't use
"1", then use "" (assuming you pass that string to the UDUNITS library).
The udunits(1) and udunits2(1) programs, however, interpret the empty
string as a user input error and ask for the input unit again.
Regards,
Steve Emmerson
UDUNITS developer
On 2/28/2011 10:18 AM, Rosalyn Hatcher wrote:
> Dear Karl,
>
> That is correct. If the variable is deemed unitless, then the checker
> will not flag an error if either units=1 or the units attribute is omitted.
> If the units attribute is missing, it will, however, produce an
> information message suggesting that the units attribute is added for
> completeness.
>
> Eg.
>
> ------------------
> Checking variable: CHL_count
> ------------------
> INFO (3.1): No units attribute set. Please consider adding a units attribute for completeness.
>
>
> I introduced the INFO category of message a while ago, for instances
> where the checker couldn't be sure of an error (E.g. where an attribute
> is being used in a non-standard way), to prompt the user to double check
> that what they've put is actually what they meant.
>
> I'll hopefully have a fixed version of the checker available tomorrow
> for testing.
>
> Regards,
> Ros.
>
>
>
>
> On 28/02/11 16:44, Karl Taylor wrote:
>> Dear Rosalyn,
>>
>> I assume the checker will also not complain if the units attribute is
>> simply omitted when the variable is unitless (i.e., either units="1"
>> or the attribute is omitted result in the same behavior by the checker).
>>
>> best regards,
>> Karl
>>
>> On 2/28/11 4:28 AM, cristina.tronconi at artov.isac.cnr.it wrote:
>>> Dear Rosalyn,
>>> thanks so much for your reply and your works that is so important for
>>> me. Infact "my" data are produced within MYOCEAN (european) project
>>> and thay are going to test them! so it is important they do not failed
>>> the CF checker test.
>>>
>>> Best regards.
>>>
>>> cristina
>>>
>>> p.s.
>>> Sorry if sometime I miss some e-mails and I didin't answer to them.
>>> This is a very caotic working time....and I'm receiving so many e-mails.
>>>
>>> Thanks to all the cf-metadata group to their help!
>>>
>>> Citando Rosalyn Hatcher<r.s.hatcher at reading.ac.uk>:
>>>
>>>> I agree units should be set to "1" and I am currently in the process of
>>>> fixing the error in the CF Checker.
>>>>
>>>> Regards,
>>>> Ros.
>>>>
>>>>
>>>> On 27/02/11 17:27, Steven Emmerson wrote:
>>>>> Cristina,
>>>>>
>>>>> I recommend the unit "1" for that use.
>>>>>
>>>>> If the CF checker doesn't like that unit, then it should be fixed,
>>>>> IMO, because that unit is supported by both the US NIST and the BIPM.
>>>>>
>>>>> Regards,
>>>>> Steve Emmerson
>>>>> UDUNITS developer
>>>>>
>>>>> On 2/26/2011 12:30 PM,cristina.tronconi at artov.isac.cnr.it wrote:
>>>>>> Dear Roy,
>>>>>> Our variable "chlorophyll count" as is understandable by CF is the
>>>>>> number of individual measurements used to determine a chlorophyll value.
>>>>>>
>>>>>> I do need to know what to put at "units" attribute for that variable.
>>>>>> I undestood by the CF convention 1.4 (appendix C) that I have to put
>>>>>> "units="1" as the chlorophyll count is a dimensionless variable...but
>>>>>> the CF checker found it as an error.
>>>>>>
>>>>>> I try not to put the Unit attribute ...but again i get an error by che
>>>>>> cf chcker.......so.....
>>>>>>
>>>>>> my question is: what unit shoudl I set for my chlorophyll count variable?
>>>>>>
>>>>>> thanks for your help.
>>>>>>
>>>>>> cristina
>>>>>>
>>>>>> -------------------------------------------------------------------
>>>>>> Cristina Tronconi
>>>>>> Istituto di Scienze dell'Atmosfera e del Clima - sezione di Roma
>>>>>> Consiglio Nazionale delle Ricerche
>>>>>> Via Fosso del Cavaliere 100
>>>>>> 00133 Roma, Italy
>>>>>> Tel: +39 06 49934342
>>>>>> cell: '39 349 1242954
>>>>>> Fax: +39 06 20660291
>>>>>> e-mail:cristina.tronconi at artov.isac.cnr.it
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> CF-metadata mailing list
>>>>>> CF-metadata at cgd.ucar.edu
>>>>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>>>> _______________________________________________
>>>>> CF-metadata mailing list
>>>>> CF-metadata at cgd.ucar.edu
>>>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>>> --
>>>> Rosalyn Hatcher
>>>> NCAS Computational Modelling Services
>>>> Dept. of Meteorology, University of Reading,
>>>> Earley Gate, Reading. RG6 6BB
>>>> Email:r.s.hatcher at reading.ac.uk Tel: +44 (0) 118 378 6016
>>>
>>> -------------------------------------------------------------------
>>> Cristina Tronconi
>>> Istituto di Scienze dell'Atmosfera e del Clima - sezione di Roma
>>> Consiglio Nazionale delle Ricerche
>>> Via Fosso del Cavaliere 100
>>> 00133 Roma, Italy
>>> Tel: +39 06 49934342
>>> cell: '39 349 1242954
>>> Fax: +39 06 20660291
>>> e-mail:cristina.tronconi at artov.isac.cnr.it
>>>
>>>
>>> _______________________________________________
>>> CF-metadata mailing list
>>> CF-metadata at cgd.ucar.edu
>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>
>>
>> _______________________________________________
>> CF-metadata mailing list
>> CF-metadata at cgd.ucar.edu
>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
>
> --
> Rosalyn Hatcher
> NCAS Computational Modelling Services
> Dept. of Meteorology, University of Reading,
> Earley Gate, Reading. RG6 6BB
> Email:r.s.hatcher at reading.ac.uk Tel: +44 (0) 118 378 6016
>
>
>
> _______________________________________________
> CF-metadata mailing list
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
Received on Tue Mar 01 2011 - 10:26:01 GMT
