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 <[email protected]> on behalf of
Jim Biard <[email protected]>
*Date: *Tuesday, 14 March 2017 15:12
*To: *"[email protected]" <[email protected]>
*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
[email protected] <mailto:[email protected]>
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: [email protected] <mailto:[email protected]>
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>. /
--
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: [email protected] <mailto:[email protected]>
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
[email protected]
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
