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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