Hi Jim,
Yes, thats correct. If you see the attached CDL in earlier email we have used coordinates
attributes on measured variables e.g
temperature:coordinates = "time latitude longitude pressure"
Andrew
----- Original Message -----
From: Jim Biard
To: cf-metadata at cgd.ucar.edu
Sent: Wednesday, May 02, 2012 4:51 AM
Subject: Re: [CF-metadata] Ocean CTD data following CF Conventions v1.6
Hi.
If someone chooses the scalar approach, isn't it necessary to declare the coordinates via the coordinates attribute on the measurement variables?
Grace and peace,
Jim
Jim Biard
Research Scholar
Cooperative Institute for Climate and Satellites
Remote Sensing and Applications Division
National Climatic Data Center
151 Patton Ave, Asheville, NC 28801-5001
jim.biard at noaa.gov
828-271-4900
On May 1, 2012, at 12:21 PM, John Caron wrote:
On 4/30/2012 8:40 PM, andrew walsh wrote:
Hi John and CF-Metadata list,
Based on your earlier advice I decided using the Scalar way to represent
the coordinate lat, long and time rather than Vector way i.e lat(lat0, lon(lon), time(time)
mainly for reason of simplicity.
the correct other choice is lat(profile), lon(profile), time(profile). not sure if you caught that.
the scalar choice is fine for 1 profile per file. the other is used to store multiple profiles in one file.
I have run the Scalar sample through the BADC netCDF checker (*Note)
at
http://titania.badc.rl.ac.uk/cgi-bin/cf-checker.pl and I now get this error
on each of the lat, lon, time variables:
ERROR (4): Axis attribute is not allowed for auxillary coordinate variables.
I don't get this error with the Vector approach. It looks like the checker thinks
my scalar lat, lon, time are 'auxilliary coordinate variables' and axis attributes
are not allowed on these. Is the checker interpreting things correctly?
i think we recently clarified that axis is acceptable on auxiliary coordinates. OTOH, its unecessary, as long as you follow the other rules for identifying coordinates (chapter 4).
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