Jonathan, What I mean is, this is not gridded data. The operations being performed (mean latitude, etc) are over a geographic region that is not described anywhere in the file, which is the region considered to be the extent of the weather system. So, you are saying that this trajectory case falls under the “Cell methods when there are no coordinates” case, is that right?
Jim Visit us on Facebook Jim Biard Research Scholar Cooperative Institute for Climate and Satellites NC North Carolina State University NOAA's National Climatic Data Center 151 Patton Ave, Asheville, NC 28801 e: [email protected] o: +1 828 271 4900 On Mar 4, 2014, at 9:30 AM, Jonathan Gregory <[email protected]> wrote: > Dear Jim > >> Even though there are no cells? That?s the part that I?m feeling confused >> about. > > Sorry, I'm not sure why you say there are no cells. "Cell" does not imply any > number of spatial dimensions - is that the problem? It means the portion of > the domain, of whatever dimensionality, which is represented by a particular > data value. The cell_methods attribute indicates how that data value > represents > unrecorded variability of the quantity represented within the cell. > > Best wishes > > Jonathan > >> On Mar 3, 2014, at 1:22 PM, Jonathan Gregory <[email protected]> >> wrote: >> >>> Dear Jim >>> >>> Yes, I think such an approach is applicable. Any data variable can have >>> cell_methods and any data variable could be used as an aux coord variable. >>> Although unusual, I don't see a reason not to have data variables of >>> latitude >>> and longitude, qualified by cell_methods, if required. >>> >>> Best wishes >>> >>> Jonathan >>> >>> ----- Forwarded message from Jim Biard <[email protected]> ----- >>> >>>> Subject: Re: [CF-metadata] can a cell method be an attribute of an >>>> auxiliary >>>> coordinate variable ? >>>> From: Jim Biard <[email protected]> >>>> Date: Fri, 28 Feb 2014 14:01:24 -0500 >>>> CC: [email protected] >>>> To: Jonathan Gregory <[email protected]> >>>> X-Mailer: Apple Mail (2.1874) >>>> >>>> Jonathan, >>>> >>>> So, I?ve got a broader question. We have a case in hand with trajectory >>>> data for a physically extensive weather system. Two data variables are >>>> the mean longitude and latitude of the system, which we are treating as >>>> the auxiliary coordinate variables. Other data variables contain >>>> measurements such as maximum latitude at the mean longitude, etc. Are >>>> cell_methods applicable in this case? There is no grid, so the cell would >>>> be the area covered by the system, and the extents of this area are not >>>> described. >>> _______________________________________________ >>> CF-metadata mailing list >>> [email protected] >>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
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