Jim: Our two GOES-R products that are height quantities are geopotential heights - (1) the quantity for which the standard_name is being requested now (geopotential_height_at_cloud_top) and (2) the height of volcanic ash clouds for which we got a standard name added last year (geopotential_height_at_volcanic_ash_cloud_top).
These heights are measured from mean sea level (represented with constant gravity). very respectfully, randy On Feb 14, 2014, at 1:02 PM, Jim Biard <[email protected]> wrote: > Randy, > > Is the geopotential height zero at the geoid? (You are unfortunate to > propose this while antennae are twitching over verticality! Please forgive > me.) I hadn’t realized before this that we have some rather specific (and > somewhat erroneous) definitions for height and altitude in the standard name > table. I see that the verbiage you have in your definition is common to a > number of other names, so I guess it’s OK until we get some things > straightened out (if we ever do!). > > Grace and peace, > > 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 Feb 12, 2014, at 4:20 PM, [email protected] wrote: > >> Dear All: >> >> I would like to propose a new standard name: >> geopotential_height_at_cloud_top >> >> definition: >> Cloud_top refers to the top of the highest cloud. Geopotential is the sum of >> the specific gravitational potential energy relative to the geoid and the >> specific centripetal potential energy. Geopotential height is the >> geopotential divided by the standard acceleration due to gravity. It is >> numerically similar to the altitude (or geometric height) and not to the >> quantity with standard name "height", which is relative to the surface. >> >> canonical units: >> m >> >> >> The timing of this proposal, and its relationship to the currently on-going >> vertical datums discussion, is purely coincidental. >> >> very respectfully, >> >> randy >> _______________________________________________ >> CF-metadata mailing list >> [email protected] >> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > ____________________________________ Randy C. Horne ([email protected]) Principal Engineer, Excalibur Laboratories Inc. voice & fax: (321) 952.5100 url: http://www.excaliburlabs.com
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