| Jonathon, Thanks. The picture is clearer now, but I think I still have a question or two. Let me try to summarize first, then ask the questions: Ok, so for example, we have the simple case of the variable containing the physical variable of sea water temperature: float t_an(time, depth, lat, lon) ; t_an:standard_name = "sea_water_temperature" ; t_an:long_name = "Objectively Analyzed Mean of Sea Water Temperature" ; // Expanded long_name following Steve's comment t_an:comment = "Objectively analyzed climatologies are the objectively interpolated mean fields for an oceanographic variable at standard depth levels for the World Ocean." ; t_an:cell_methods = "area: mean depth: mean time: mean" ; // added space between dimension and method, following Jonathan's comment t_an:grid_mapping = "crs" ; t_an:units = "degrees_celsius" ; t_an:FillValue = 9.96921e+36f ; And, I would point out there there are cell bounds variables as well for lat, lon, depth, and a climatology_bounds for climatological time (time axis is a climatological time axis). So, we have a standard name, plus cell_methods. The next case for these data is where we have a statistical value that is contained in the variable, but where no standard_name modifier exists… here is an example then for standard deviation of that sea water temperature: float t_sd(time, depth, lat, lon) ; t_an:standard_name = "sea_water_temperature" ; // Use the physical parameter's standard_name, following Jonathan's comment t_an:long_name = "Temporal Standard Deviation about the Statistical Mean Sea Water Temperature" ; // Expanded long_name following Steve's comment t_an:comment = "The temporal standard deviation about the statistical mean Sea Water Temperature in each grid-square at each standard depth level" ; // just highlighting changes compared to our existing draft t_an:cell_methods = "area: mean depth: mean time: standard_deviation" ; // sequence is correct I think, take area-depth mean first, then compute standard deviation over time t_an:grid_mapping = "crs" ; t_an:units = "degrees_celsius" ; t_an:FillValue = 9.96921e+36f ; Seems simple enough, though I do need to confirm with Tim that the variable is in fact a temporal standard deviation. Now the third case is where there exists a relevant standard_name modifier, for example, for the standard error of the mean: float t_se(time, depth, lat, lon) ; t_an:standard_name = "sea_water_temperature standard_error" ; // Use the physical parameter's standard_name plus modifier, following Jonathan's comment t_an:long_name = "Standard Error about the Statistical Mean Sea Water Temperature" ; // Expanded long_name following Steve's comment t_an:comment = "The standard error about the statistical mean Sea Water Temperature in each grid-square at each standard depth level" ; // just highlighting changes compared to our existing draft t_an:cell_methods = "area: mean depth: mean" ; // Is this correct?? Since we have a standard name modifier, and no cell_methods string for standard error? t_an:grid_mapping = "crs" ; t_an:units = "degrees_celsius" ; t_an:FillValue = 9.96921e+36f So, my question arises in this last example, where a standard name modifier exists. I guess this is the part I don't understand…. is there no reference to cell_methods for the time dimension in the standard error variable t_se? If so, why is there a standard_error standard_name modifier but not one for standard_deviation? Thanks, Ken On Mar 25, 2013, at 1:40 PM, Jonathan Gregory <[email protected]> wrote: Dear KenThanks for your response too (copied here? is it bad form in a listserv to consolidate responses like this?) Kenneth S. Casey, Ph.D. Technical Director NOAA National Oceanographic Data Center 1315 East-West Highway Silver Spring MD 20910 301-713-3272 x133 http://www.nodc.noaa.gov   |
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