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 <jbiard at cicsnc.org> 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
>
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> On Feb 12, 2014, at 4:20 PM, rhorne at excaliburlabs.com 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
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____________________________________
Randy C. Horne (rhorne at excaliburlabs.com)
Principal Engineer, Excalibur Laboratories Inc.
voice & fax: (321) 952.5100
url:
http://www.excaliburlabs.com
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