Dear John and Martin
I see that "barometric altitude" is a term which is in use, so I accept that
it's OK for a standard name. I thought it worthwhile to ask the question.
Best wishes and thanks
Jonathan
On Sat, Jul 06, 2013 at 08:43:10AM -0700, John Graybeal wrote:
> Date: Sat, 6 Jul 2013 08:43:10 -0700
> From: John Graybeal <john.graybeal at marinexplore.com>
> To: CF Metadata List <cf-metadata at cgd.ucar.edu>
> Subject: Re: [CF-metadata] Request for a new standard_name:
> barometric_altitude
> X-Mailer: Apple Mail (2.1508)
>
> Sorry my response was offline, an accident; will append below for the record.
>
> I support Martin's rationale for sticking with the original; it will also be more recognizable to many. This may be a good spot for using aliases, one direction or the other, as it seems "barometric altitude" is functionally exactly the same meaning as "air pressure expressed as altitude".
>
> Previously commented offline:
>
> > I may be having a silly moment, can you explain how the second definition matches the second name? I would have assumed altitude_above_ground means how far the airplane is above the terrain -- in this case based on a barometric pressure altitude, and some knowledge of how high the ground is in a given location.
> >
> > Instead the definition seems to be more like barometric_altitude_based_on_takeoff_pressure.
>
> John
>
>
> On Jul 6, 2013, at 05:25, "Schultz, Martin" <m.schultz at fz-juelich.de> wrote:
>
> > Dear Jonathan (and John who replied offline),
> >
> > "* Would it be acceptable and useful to follow some other kinds of standard name and call this air_pressure_expressed_as_altitude?"
> >
> > Actually, I think not. The goal of this quantity is really to describe altitude, not pressure. This is different from a "mole_fraction..._expressed_as...", because there it is really the same thing with a simple conversion factor. So, I would still prefer "barometric_altitude".
> >
> > Concerning the second name, I see that we need to define this better. Actually, it doesn't seem as straightforward as I thought... We will take your comments into account when rephrasing the proposal for the second name.
> >
> > Best regards,
> >
> > Martin
> >
> > From: Jonathan Gregory <j.m.gregory at reading.ac.uk>
> > To: cf-metadata at cgd.ucar.edu
> > Subject: [CF-metadata] Request for a new standard_name:
> > barometric_altitude
> > Message-ID: <20130705165717.GA32174 at met.reading.ac.uk>
> > Content-Type: text/plain; charset=us-ascii
> >
> > Dear Martin
> >
> > Obviously these quantities are useful. I have two suggestions for your
> > consideration, hoping I have understood the idea.
> >
> > * Would it be acceptable and useful to follow some other kinds of standard name
> > and call this air_pressure_expressed_as_altitude?
> >
> > * above_ground doesn't seem specific enough to me, because you don't mean the
> > local ground, which we would usually call "surface" in standard names (i.e. the
> > bottom of the atmosphere). To be more precise, we could use something longer
> > such as wrt_surface_at_flight_origin. It refers to a particular time and place.
> >
> > Best wishes
> >
> > Jonathan
> >
> >
> >
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> John Graybeal
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Received on Mon Jul 08 2013 - 13:14:58 BST
