Dear Jim That is an ingenious idea. I don't think the flag atts are currently allowed for coord variables, but they could be, I agree.
Best wishes Jonathan ----- Forwarded message from Jim Biard <jbi...@cicsnc.org> ----- > Date: Tue, 11 Oct 2016 14:39:56 -0400 > From: Jim Biard <jbi...@cicsnc.org> > To: cf-metadata@cgd.ucar.edu > Subject: Re: [CF-metadata] Missing data bins in histograms > User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) > Gecko/20100101 Thunderbird/45.4.0 > > Hi. > > Another approach could be to use flag_values and flag_meanings on > the coordinate variable to indicate one or more special coordinate > values that correspond to any number of "missing data" or "out of > bounds" bins. These attributes aren't forbidden by CF, and > everything should be fine as long as the coordinate variable remains > monotonic. > > Grace and peace, > > Jim > > On 10/11/16 8:41 AM, martin.juc...@stfc.ac.uk wrote: > >Hello, > > > >the CF standard name list has two "histogram_.... " entries, and in the > >CMIP6 data request we may need to add a third, a > >histogram_of_cloud_top_height. Besides the standard name, we also need, for > >this new variable, a method of encoding the "missing data" bin in the > >histogram. That is, the histogram should record frequency in 16 data bins > >and one additional bin for the frequency of missing data. > > > >Can we define a "missing_data_index" attribute for histogram variables, and > >use this to indicate that the first bin in the array has this special > >purpose. It might be more pythonic to put the _FillValue in the coordinate > >value for the missing data bin, but I suspect that this would cause > >substantial problems for many software packages. > > > >regards, > >Martin > >_______________________________________________ > >CF-metadata mailing list > >CF-metadata@cgd.ucar.edu > >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 > > /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 ----- End forwarded message ----- _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
