A common question, the answer to which depends on where you are. "sea level" is indicated by a different number depending on where you are. Since altitude is mostly defined in relation to an abstract model of the earth, sea level rarely equates to altitude of zero.
BTW, when I say "no altitude", I mean "I don't know what the altitude is", not "this position has an altitude of sea level" for some definition of sea level.
> -----Original Message-----
> From: Glen Zorn [mailto:gwz@net-zen.net]
> Sent: Tuesday, 9 June 2009 2:41 PM
> To: trac@localhost.amsl.com; Thomson, Martin
> Cc: geopriv@ietf.org
> Subject: RE: [Geopriv] [geopriv] #8: Altitude type of 0 == no altitude
>
> > #8: Altitude type of 0 == no altitude
> > ---------------------------------------+-----------------------------
> --
> > -----
> > Reporter: martin.thomson@andrew.com | Owner:
> > Type: defect | Status: new
> > Priority: major | Milestone:
> > Component: rfc3825bis | Version:
> > Severity: - | Keywords: altitude
> > ---------------------------------------+-----------------------------
> --
> > -----
> > RFC 3825 seems to indicate that an altitude type of 0 indicates that
> > there
> > is no altitude defined.
>
> Just wondering: if that is really the case, how is sea level indicated?
>
> > This needs to be clearer in the bis.
> >
> > Q: is altitude type 0 valid?
> >
> > Q: what meaning is attached to altitude type 0?
> >
> > Q: what is the impact of having no altitude on the existing datum
> > definitions?
> >
> > --
> > Ticket URL: <http://trac.tools.ietf.org/wg/geopriv/trac/ticket/8>
> > geopriv <http://tools.ietf.org/geopriv/>
> >
> > _______________________________________________
> > Geopriv mailing list
> > Geopriv@ietf.org
> > https://www.ietf.org/mailman/listinfo/geopriv
>
>
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