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http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table3-15.shtml http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table4-5.shtml or we could refer to these if deemed complete enough. This could be an appendix that might would be useful to storing any type of data in CF. Jonathan Gregory wrote:
Dear John GAlso I don't think we should confuse the z of the quantity being measured with the z of the platform which is measuring it.I don't think we are confusing those two values.For a precipitation flux or a pressure at mean sea level (calculated by correcting surface pressure to sea level) there a station altitude, of course, but that is not the "altitude" of the quantity measured. Precipitation is by definition a surface quantity, and pressure at mean sea level is at mean sea level, so doesn't have an altitude. I would regard the altitude in these cases as useful ancillary metadata, but not a coordinate. For temperature measured in a met enclosure, the Z coordinate would be height (=1.5 m or 2 m). The station still has the same altitude as for the precipitation measurement, but you would record the height, not the altitude, as the Z coord. (At least, in all the model data archived at PCMDI, surface air temperature has a Z coord of height.) I think that shows that the altitude of the station is *not* the Z of the precipitation or the sea-level pressure value. However, it is definitely useful to know and should be recorded. Best wishes Jonathan G _______________________________________________ cf-pointobsconvention mailing list cf-pointobsconvention@xxxxxxxxxxxxxxxxFor list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
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