David,
I'm still not convinced of the utility of axis for coordinate variables
that aren't true coordinate variables, but this case doesn't fit that
one, does it? In this case isn't height a true (scalar) coordinate
variable? Shouldn't this pass the checker, regardless?
Jim
On 5/24/17 3:54 PM, David Hassell wrote:
Hi Jim, Martin,
I agree - "height" in this case is not an auxiliary coordinate
variable, rather a scalar coordinate variable (because it doesn't span
any of the dimensions of "tas").
I also agree that the conformance document needs changing to allow the
"axis" attribute on auxiliary coordinate variables - this was accepted
in CF-1.6, I think.
Thanks,
Daivd
On 24 May 2017 at 19:59, Jim Biard <jbi...@cicsnc.org
<mailto:jbi...@cicsnc.org>> wrote:
Martin,
We just had some discussion about the proper use of the axis
attribute, but this seems to me like it might be a flaw in the
checker. As a scalar coordinate, height can only be associated
with the tas variable via the coordinates attribute (per section
5.7), but I don't think that makes it an auxiliary coordinate,
does it?
What do other people think? Chime in!
Grace and peace,
Jim
On 5/23/17 10:50 AM, martin.juc...@stfc.ac.uk
<mailto:martin.juc...@stfc.ac.uk> wrote:
Hello All,
I'd just like to check one aspect of the conformanc document, which came to
our attention when somebody ran the CF checker on some CMIP5. If you check
using the convention version declared in the file, 1.4, it will raise an error
if there is a scalar coordinate variable with the axis attribute set, e.g.
float tas(time,lat,lon);
......
tas:coordinates = "height" ;
float height ;
....
height: axis = "Z";
In this case "height" variable is, following the logic of section 1.2 of the
convention, classed as an auxillary coordinate because it is not of the form "height (height)
; ".
The error message appears to relate to a line in the conformance document saying that
"The axis attribute is not allowed for auxiliary coordinate variables." If the
checker is asked to use a later version of the convention, the error message goes away,
but the requirement is still there in the conformance document.
It looks to me as though it should be removed from the conformance document. The
convention document says, in section 4. that "The methods of identifying coordinate
types described in this section apply both to coordinate variables", referring to
the use of the axis attribute, which appears to directly contradict the line of the
conformance document cited above. But is there another part of the convention that
requires some restriction on the use of the axis attribute?
This construction is widely used in CMIP data, so we should get this point
cleared up.
regards,
Martin
_______________________________________________
CF-metadata mailing list
CF-metadata@cgd.ucar.edu <mailto:CF-metadata@cgd.ucar.edu>
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
<http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata>
--
CICS-NC <http://www.cicsnc.org/> Visit us on Facebook
<http://www.facebook.com/cicsnc> *Jim Biard* *Research Scholar*
Cooperative Institute for Climate and Satellites NC
<http://cicsnc.org/> North Carolina State University
<http://ncsu.edu/> NOAA National Centers for Environmental
Information <http://ncdc.noaa.gov/> /formerly NOAA’s National
Climatic Data Center/ 151 Patton Ave, Asheville, NC 28801 e:
jbi...@cicsnc.org <mailto:jbi...@cicsnc.org> o: +1 828 271 4900
<tel:%28828%29%20271-4900> /Connect with us on Facebook for
climate <https://www.facebook.com/NOAANCEIclimate> and ocean and
geophysics <https://www.facebook.com/NOAANCEIoceangeo>
information, and follow us on Twitter at @NOAANCEIclimate
<https://twitter.com/NOAANCEIclimate> and @NOAANCEIocngeo
<https://twitter.com/NOAANCEIocngeo>. /
_______________________________________________ CF-metadata
mailing list CF-metadata@cgd.ucar.edu
<mailto:CF-metadata@cgd.ucar.edu>
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
<http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata>
--
David HassellNational Centre for Atmospheric ScienceDepartment of
Meteorology, University of Reading, Earley Gate, PO Box 243, Reading
RG6 6BB Tel: +44 118 378 5613http://www.met.reading.ac.uk/
--
CICS-NC <http://www.cicsnc.org/> Visit us on Facebook
<http://www.facebook.com/cicsnc> *Jim Biard* *Research Scholar*
Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/>
North Carolina State University <http://ncsu.edu/> NOAA National Centers
for Environmental Information <http://ncdc.noaa.gov/> /formerly NOAA’s
National Climatic Data Center/ 151 Patton Ave, Asheville, NC 28801 e:
jbi...@cicsnc.org <mailto:jbi...@cicsnc.org> o: +1 828 271 4900 /Connect
with us on Facebook for climate
<https://www.facebook.com/NOAANCEIclimate> and ocean and geophysics
<https://www.facebook.com/NOAANCEIoceangeo> information, and follow us
on Twitter at @NOAANCEIclimate <https://twitter.com/NOAANCEIclimate> and
@NOAANCEIocngeo <https://twitter.com/NOAANCEIocngeo>. /
_______________________________________________
CF-metadata mailing list
CF-metadata@cgd.ucar.edu
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
