Jon,
I agree that a cell_methods attribute doesn't seem to be necessary. A
new standard_name like 'day_in_year' or 'day_of_year' would likely make
things clearer.
Jim
On 3/15/17 11:22 AM, Jon Blower wrote:
>
> Thanks Jim, that?s very helpful. Is cell_methods necessary in this
> case (for the time axis bounds) ? probably not since this isn?t a
> statistical quantity like an average, but a value that?s
> ?representative? of the year.
>
> I seem to remember from a while back that there was a proposal to
> allow time axes to use ?calendar years since X? (as opposed to ?years
> since X?, which uses a fixed-length UDUNITS year), which might handle
> this use case. I have been out of the loop for a while, but I can?t
> find mention of that in the CF spec, so maybe that didn?t go through.
>
> I might consider requesting a new standard name ? ?days? is good, but
> I wonder if a more specific one would be helpful.
>
> Best wishes,
> Jon
>
> *From: *CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of
> Jim Biard <jbiard at cicsnc.org>
> *Date: *Tuesday, 14 March 2017 15:12
> *To: *"cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
> *Subject: *Re: [CF-metadata] Recording "day of year on which something
> happens"
>
> Jon,
>
> 1) I'd use 'days'. It is a valid standard name apart from the 'days
> since date' formalism. It's not perfect, but it's legal. You could,
> alternatively, request a new standard name.
>
> 2) Use a time_bounds variable. I would tend to set the time to be July
> 1 at midnight for each year, and set the bounds for each year to Jan 1
> of that year and Jan 1 of the next year.
>
> Grace and peace,
>
> Jim
>
> On 3/14/17 10:43 AM, Jon Blower wrote:
>
> Hi all,
>
> We need to structure a NetCDF file that will hold a variable that represents the day of the year on which an event happened (integers from 0 to 366). This value is recorded every year for a number of years. I have a couple of questions about how best to do this:
>
> 1. What is the best standard name to use for the day of the year? I didn?t find anything in the standard name table, although I might have missed it.
>
> 2. What would be the best way to define the time axis? Each point along the axis would represent a whole year, rather than an instant in time. I could simply pick an arbitrary instant (e.g. midnight on 1st Jan) to represent the year, but is there a better way?
>
> Thanks in advance for any help!
>
> Jon
>
> _______________________________________________
>
> CF-metadata mailing list
>
> CF-metadata at cgd.ucar.edu <mailto:CF-metadata at cgd.ucar.edu>
>
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
> --
>
> *ICS-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 <mailto: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>. /
>
--
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 <mailto: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>. /
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.cgd.ucar.edu/pipermail/cf-metadata/attachments/20170315/da656fa9/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 15785 bytes
Desc: not available
URL: <http://mailman.cgd.ucar.edu/pipermail/cf-metadata/attachments/20170315/da656fa9/attachment.png>
-------------- 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/20170315/da656fa9/attachment-0001.png>
Received on Wed Mar 15 2017 - 10:28:25 GMT
