Hi all,
With regard to the CF Checker not complaining about the global attribute
"grid_mapping"...
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!
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.
cristina.tronconi at artov.isac.cnr.it wrote:
> Hello,
> I have a netcdf file in which I have my variable
> (tim,lat,lon), then the vector of regular lat and a vector for
> regular lon.
>
> 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
> ------------------------------------
> 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!!!!
>
> first question:
> Is it still correct /with cf 1.4) to set a global attribute as
> "grid_mapping"?
> or must I put the same information as variable attribute? in this
> case, how?
>
> second question:
> are "Equidistant Cylindrical" and "Cylindrical" still valid values for
> grid_mapping (or grid_mapping name)?
>
> thanks in advanced
> 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
>
> ------------------------------------------------------------------------
>
> [Allegato tolto: Tipo originale dell'allegato: "application/octet-stream", nome: "20100523_di-OC_CNR-L3-CHL-MedOC3_a_1Km-MED-NRT-V01.nc"]
> ------------------------------------------------------------------------
>
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>
--
------------------------------------------------------------------------
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 Tue Jun 22 2010 - 02:29:39 BST
