Dear Jonathan: Thanks for taking the time to reply. In the case of GOES-R, the ground system will not know what type of fire it is. Because our products generally coverage very large areas, it will be common for many fires to be detected and included in instances of our products. The imager aboard the spacacraft has several IR channels, and, basically, the ground processing software looks for "hot" pixels that is on land and where it is not cloudy. What about rain, smoke, dust, and volcanic ash area_types ?
Also, in you reply below, you state that area_type could be used as a dimension of data variables. I could not find anything in the CF standard that explains this (maybe you are referring to the "where typevar" discussion in CF standard para. 7.3.3.). very respectfully, randy ---------------------------------------- From: "Jonathan Gregory" <j.m.greg...@reading.ac.uk> Sent: Monday, July 08, 2013 3:11 PM To: cf-metadata@cgd.ucar.edu Subject: [CF-metadata] a conceptual question about "area_types" Dear Randy Yes, I would say that fire could be an area type, except that it would be nice to be more specific about it. Does it mean wildfire? Expanding the area type is not a slippery slope; the table was created in order to avoid expanding the number of standard names because of the introduction of more types, as well as so area type could be used as a dimension of data variables. Cheers Jonathan ----- Forwarded message from Randy Horne <rho...@excaliburlabs.com> ----- > Date: Sun, 7 Jul 2013 13:19:05 -0400 > From: Randy Horne <rho...@excaliburlabs.com> > To: "cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> > Subject: [CF-metadata] a conceptual question about "area_types" > X-Mailer: Apple Mail (2.1508) > > Folks: > > The current area_type table includes "cloud", "snow", and "vegetation". These are environmental conditions whose existence and location vary over time. > > In GOES-R, we are generating rainfall, fire, aerosol (smoke and dust), and volcanic ash product files. These product files contain statistics (e.g. min, max, mean, std dev) that are associated with only those regions on the earth where these environmental conditions are found. For the variables containing these statistics, we are using cell_methods. A "where fire" clause would make sense (if "fire" were in the area_type table). It would seem a "where fire" clause is conceptually the same as "where cloud". > > If they are the conceptually same, there would be value to expanding the area_type table. However, I can see a slippery slope forming as the area_type table could grow large. > > If they are not conceptually the same, what am I missing ? > > very respectfully, > > randy > _______________________________________________ > 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
_______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
