Re: [dhcwg] Fwd: Working Group Last Call: Location Configuration Information for GEOPRIV

Robert Elz <kre@munnari.OZ.AU> Fri, 20 June 2003 12:44 UTC

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From: Robert Elz <kre@munnari.OZ.AU>
To: Ralph Droms <rdroms@cisco.com>
cc: dhcwg@ietf.org, mankin@psg.com, geopriv@mail.apps.ietf.org
Subject: Re: [dhcwg] Fwd: Working Group Last Call: Location Configuration Information for GEOPRIV
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The definitions of altitude in that draft need work.

Metres (positive and negative) is simple enough, but relative to
what?   Unless I missed it, I could find no definition of what is 0.

If the assumption is that it is to be "mean sea level" then which sea?
If it is to be above (+ or - below) ground level, which ground level
within the designated area given by the latitude and longitude (sloping
ground).

When measured in floors, the "0" means ground level is fine, but
how are floors counted?   Is there some standard, or does anyone
count them however they like.   Can one assume that if some device
is at altitude (as a floor) N, then something at N+2 will be two
floors up?    If N==12?   How do buildings with offset floors work,
where in one side of the building you can go up (naturally) a floor
at a time, but on the other side all the levels are offset by a
half a floor?   Just to confuse things more, there's a building
not too far away from where I am which has two "level 2" floors,
that is, the elevator stops twice between floor 1 and floor 3
(they're called 2b and 2d - though I have not the vaguest idea
what the 'b' and 'd' mean - 2d is above 2b).   There needs to be
more text describing just what floor numbers mean, and perhaps how
the numbers are meant to be translated to and from the external
designations that people use.

kre


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