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?
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--
------------------------------------------------------------------------
Rosalyn Hatcher
NCAS Computational Modelling Services
Dept. of Meteorology, University of Reading,
Earley Gate, Reading. RG6 6BB
Email: [email protected] Tel: +44 (0) 118 378 6016
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