On 7/16/2010 2:12 AM, [email protected] wrote:
Helloevertybody,
I have a netcdf file (chlorophyll gridded satellite daily map) in
which I have my variable chl(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
------------------------------------
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.
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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