>>> My grid mapping is Equidistant Cylindrical. SO in the nc I set as
>>> GLOBAL ATTRIBUTE
>>> ----------------------------------
>>> attname=Conventions
>>> value=CF-1.4
>>>
>>> attname=grid_mapping
>>> value=Cylindrical
>>> ------------------------------------
>>> Some question:
>>> 1) A collegue of mine told me that for CF 1.4 the grid_mapping is no
>>> more
>>> a global attribute but it is a variable attribute named as
>>> "grid_mapping_name".
>>>
>>> BUT I run the CF checker for 1.4 on my file and everything is ok!!!!
>>
>> The CF checker is limited in understanding the semantics, it often only
>> checks syntax.
From my understanding of the Conventions there are 7 standard global
attributes:
'Conventions','title','history','institution','source','reference','comment'
However, there is nothing stopping non-standard global attributes being
defined.
"2.6: This standard describes many attributes (some mandatory, others
optional), but
a file may also contain non-standard attributes. Such attributes do not
represent a
violation of this standard."
Please correct me if I'm wrong! As stated above there is only so much
intelligence
that can added to the checker, often it is checking semantics.
I guess I could get the checker to compare any non-standard global
attribute with
the list of defined attributes in Appendix A and if it finds a match
issue an informational
statement.
Regards,
Rosalyn.
>>
>>>
>>> SO: Is it still correct /with cf 1.4) to set a global attribute as
>>> "grid_mapping" in the case (obviuosly) all the variables use the same
>>> grid_mapping? or must I put the same information as variable
>>> attribute? in this case, how?
>>
>> I dont think a global attribute was ever CF compliant. Why do you think
>> it was?
>>
>> In any case, you need to add an attribute to each data variable. see
>> examples in section 5.6
>>
>>> 2) are "Equidistant Cylindrical" and "Cylindrical" still CF valid
>>> values for
>>> grid_mapping (or grid_mapping name)? I found only "Equirectangular" In
>>> the "Content Standard for Digital Geospatial Metadata. Federal
>>> Geographic Data Committee, FGDC-STD-001-1998" document mentioned in
>>> the Appendix F. Grid Mappings of CF 1.4.
>>
>> We dont seem to have this projection in our list. Does anyone have
>> experience with 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
Received on Wed Jul 21 2010 - 02:56:38 BST
