Dear all,
thanks for your answers. I usually use the standard-name table for
parameters than for the reference-system. I really would like to see the
coordinate-axis standard-names as part of the CF-documentation, since we
have already most of them there (ocean_sigma_coordinate,
projection_x_axis, time). I'm not aware of a FAQ for CF?
I've never seen a file with geometrical height. If I understand Jim
correctly, values are in the order of magnitude 6371km (=earth radius).
Reading the definition of altitude at wikipedia, it seems to be a
equivalent to height_above_reference_ellipsoid. But, as John points out,
the CF standard-name descriptions sayt the geoid is defined to be MSL,
so it's fine for me, unless we want to have different standard_names for
reference-systems than for parameters.
Best regards,
Heiko
On 2014-02-07 19:49, Jim Biard wrote:
Geometrical height is sometimes used synonymously with geodetic height,
but the strict interpretation is height above the ellipsoid surface
along a line from the center of the Earth to the surface. Geodetic
heights are normal to the ellipsoid surface.
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On Feb 7, 2014, at 1:25 PM, Jonathan Gregory <[email protected]
<mailto:[email protected]>> wrote:
Dear Heiko
1. height above ground
has standard_name of height, as you say
2. height above mean sea level
I don't think we have a standard name for this yet, but
height_above_sea_level
would be consistent with existing names. For example, there is a
stdname of
sea_surface_height_above_sea_level.
3. depth below surface
is depth, as you say.
4. geometrical height
What does this mean? i.e. height above what reference level?
altitude is height above the geoid. Maybe that is geometrical height?
And for pressure vertical coordinates: is the correct standard_name
'air_pressure'?
Yes.
Could these eventually be mentioned in the Convention besides the
standard_names for dimensionless vertical coordinates?
This sounds to me like another possible entry for a FAQ. Would that be
a good
idea?
Best wishes
Jonathan
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