Dear John,
As a complement to what Michael said, on the following link:
http://earth.esa.int/brat/html/alti/principle/basic_en.html you have an example of the differences between the two quantities. In that case the satellite altitude refers to ' height_above_reference_ellipsoid' standard name whereas geoid refers to 'geoid_height_above_reference_ellipsoid'.
Best regards,
Olivier.
-----Message d'origine-----
De?: cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-bounces at cgd.ucar.edu] De la part de Godin, Michael
Envoy??: mardi 20 octobre 2009 23:57
??: John Caron
Cc?: CF metadata list
Objet?: Re: [CF-metadata] geoid_height_above_reference_ellipsoidvsheight_above_reference_ellipsoid
John,
I believe the first name (geoid_height_above_reference_ellipsoid) refers to the difference between the height of a geiod (a smooth approximation of the earth's surface) and a reference ellipsoid (an extremely smooth approximation of the earth's surface). Hence it is not time-variant. The second (height_above_reference_ellipsoid) refers to the height of a (optionally time varying) quantity above a reference ellipsoid -- it is likely intended to be used as a coordinate variable.
Johnathan has a thorough explanation in an archived e-mail dated early on 9/29/2008.
Mike
-----Original Message-----
From: cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of John Caron
Sent: Tuesday, October 20, 2009 2:16 PM
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] geoid_height_above_reference_ellipsoid vsheight_above_reference_ellipsoid
||whats the difference between these two standard names:
geoid_height_above_reference_ellipsoid <javascript:void(0)>
||height_above_reference_ellipsoid <javascript:void(0)>
??
is there a discussion about this somewhere? I just noticed that the mail
archives don't seem to be searchable ??
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