Dear Jonathan: Your recommendation of changing the cell method name from the standard_name to "area" is analogous to the recommendation you provided me at the start of this message thread. In para 7.3.4 (Cell methods when there are no coordinates). the first sentence is: "To provide an indication that a particular cell method is relevant to the data without having to provide a precise description of the corresponding cell, the "name" that appears in a "name: method" pair may be an appropriate standard_name (which identifies the dimension) or the string, "area" (rather than the name of a scalar coordinate variable or a dimension with a coordinate variable)." Can you explain when standard_name serving as the name (rather than "area") is appropriate ? very respectfully, randy
---------------------------------------- From: "Jonathan Gregory" <j.m.greg...@reading.ac.uk> Sent: Wednesday, March 05, 2014 4:41 AM To: cf-metadata@cgd.ucar.edu Subject: [CF-metadata] can a cell method be an attribute of an auxiliary coordinate variable ? Dear Jim > We are attempting to follow section 9. The centroid of the weather system is calculated at each time step, and we are planning to use the longitude and latitude calculated as the coordinates of the system. So, for example, would the variables below be OK? (I?ve left out time and numerous other variables.) > > float lat(trajectory, obs) > :standard_name = ?latitude? > :axis = ?Y? > :cell_methods = ?latitude:mean (over system)? > > float lon(trajectory, obs) > :standard_name = ?longitude? > :axis = ?X? > :cell_methods = ?longitude:mean (over system)? > > float maxlat(trajectory, obs) > :cell_methods = ?latitude:maximum (over system)" > > float mtpwv(trajectory, obs) > :long_name = ?mean total precipitable water vapor? > :cell_methods = ?area:mean (over system)? I think the approach is OK but I would suggest for latitude and longitude "area: mean (over system)" and for maxlat "area: maximum (over system)". These indicate statistics of lat and lon which are calculated from the variation over the area of the system. Is that what you intend? The cell_methods is a blank- separated list of words, so there's a space after ":". Cheers Jonathan _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
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