On Thu, Sep 15, 2016 at 5:40 AM, Jim Biard <jbiard at cicsnc.org> wrote:
> That's a completely valid suggestion. We have to consider implications for
> backwards compatibility. Among other things, UDUNITS would need to change
> their convention, since CF follows UDUNITS in this matter, as with all
> other units.
>
As long as UDUNITS accepts ISO-compliant strings, then we're good. And it
looks like it does.
> There's nothing that says we can't make changes. I was explaining the "is"
> as opposed to the "could be" with time units.
>
The only change I would suggest at the moment would be to "prefer"
ISO-complienat time strings, and therefore use them in the examples.
-CHB
> Grace and peace,
>
> Jim
>
> On 9/15/16 7:26 AM, Little, Chris wrote:
>
> Jim and Chris B,
>
> I would like to weigh in here, please?
>
> Adhering to UDUnits has merits, but once one adopts ISO8601-like notations, as there is no way of specifying otherwise, people assume it *is* ISO8601 and therefore a string without a time zone marker indicates local time (whatever that is - Solar? Mean Solar? Sidereal? National legal?)
>
> There is work just starting in the OGC/ISO pipeline on how to indicate a non-Gregorian calendar using ISO8601 like notation, for the WKT communities.
>
> Personally, I would advocate ISO8601 strict adherence, as most of the recommended best practices and profiles, such as RFC3339, are generally strict subsets of ISO 8601.
>
> Chris
>
>
> -----Original Message-----
> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu <cf-metadata-bounces at cgd.ucar.edu>] On Behalf Of cf-metadata-request at cgd.ucar.edu
> Sent: Wednesday, September 14, 2016 10:02 PM
> To: cf-metadata at cgd.ucar.edu
> Subject: CF-metadata Digest, Vol 161, Issue 3
>
> Send CF-metadata mailing list submissions to
> cf-metadata at cgd.ucar.edu
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> or, via email, send a message with subject or body 'help' to
> cf-metadata-request at cgd.ucar.edu
>
> You can reach the person managing the list at
> cf-metadata-owner at cgd.ucar.edu
>
> When replying, please edit your Subject line so it is more specific than "Re: Contents of CF-metadata digest..."
>
>
> Today's Topics:
>
> 1. nitpick in time axes example (Chris Barker)
> 2. Re: nitpick in time axes example (Jim Biard)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 14 Sep 2016 12:34:11 -0700
> From: Chris Barker <chris.barker at noaa.gov> <chris.barker at noaa.gov>
> To: "cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu> <cf-metadata at cgd.ucar.edu> <cf-metadata at cgd.ucar.edu>
> Subject: [CF-metadata] nitpick in time axes example
> Message-ID:
> <CALGmxE+S80kd1CnD-55btZZhz=Vko-bbbpS-Bv2w2a-bu0wuvw at mail.gmail.com> <CALGmxE+S80kd1CnD-55btZZhz=Vko-bbbpS-Bv2w2a-bu0wuvw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> I see in teh doc:
>
> Example 4.4. Time axis
>
> double time(time) ;
> time:long_name = "time" ;
> time:units = "days since 1990-1-1 0:0:0" ;
>
> IIUC, ISO 8601 requires two digits for the time pieces [1], so that should
> be:
>
> "days since 1990-1-1 00:00:00"
>
>
> The parser I use isn't picky about this, but maybe some are?
>
> BTW, as it's an example, we should probably throw a time offset on there,
> too:
>
> "days since 1990-1-1 00:00:00Z"
>
>
> or
>
> "days since 1990-1-1 00:00:00+00:00"
>
>
> [1] at least according to wikipedia:https://en.wikipedia.org/wiki/ISO_8601#Times
>
>
> -Chris
>
>
>
>
> --
> [image: 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: jbiard at 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 _at_NOAANCEIclimate <https://twitter.com/NOAANCEIclimate> and
> _at_NOAANCEIocngeo <https://twitter.com/NOAANCEIocngeo>. *
>
> _______________________________________________
> CF-metadata mailing list
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
>
--
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chris.Barker at noaa.gov
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.cgd.ucar.edu/pipermail/cf-metadata/attachments/20160915/c7ca3134/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: CicsLogoTiny.png
Type: image/png
Size: 15784 bytes
Desc: not available
URL: <http://mailman.cgd.ucar.edu/pipermail/cf-metadata/attachments/20160915/c7ca3134/attachment-0001.png>
Received on Thu Sep 15 2016 - 13:10:27 BST
