Re: [dhcwg] Fwd: Working Group Last Call: Location Configuration Information for GEOPRIV
Robert Elz <kre@munnari.OZ.AU> Sat, 21 June 2003 10:19 UTC
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From: Robert Elz <kre@munnari.OZ.AU>
To: John Schnizlein <jschnizl@cisco.com>
cc: dhcwg@ietf.org, geopriv@mail.apps.ietf.org
Subject: Re: [dhcwg] Fwd: Working Group Last Call: Location Configuration Information for GEOPRIV
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Date: Sat, 21 Jun 2003 17:16:49 +0700
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Date: Fri, 20 Jun 2003 15:44:23 -0400 From: John Schnizlein <jschnizl@cisco.com> Message-ID: <4.3.2.7.2.20030620151602.0200e778@wells.cisco.com> | To cover any cases where it is not, we propose clarifying text as follows: | If MU = 1, an AltRes value 0 would indicate unknown altitude. That's fine, and a good idea. | The most precise Altitude would have an AltRes value of 30. | Unless otherwise defined by datum, a value of 0 is with respect | to mean-low-tide. | It is our understanding that mean low tide is well defined, since | political and personal land-ownership boundaries are based on it. In most places it is, but consider you're somewhere in the middle of Panama, which low tide do you consider, the Atlantic, or the Pacific? There's a considerable distance in height between the two. I'd be tempted to pick the mean earth radius, and define that as 0, except then heights would be meaningless just about everywhere when compared to normal usages (not above ground level, not mean low tide sea level, not ...). Good luck finding some way that defines 0 precisely. | The reason this is a twos-complement value is to cover below zero | altitudes as well as above zero altitudes. Yes, that was obvious (I didn't think I said anything to question that). | We are not attempting to represent any slope of the ground. The | altitude is that of a point within the horizontal resolution of the | horizontal location values. No, I didn't think you were - but because the 0 point wasn't specified anywhere that I could see (if it is there and I missed it, perhaps it needs better highlighting), one possible definition of 0 may have been "ground level at the latitude and longitude specified". That would be fine when all 34 bits of precision were used, but when things are being deliberately vague, there would be no particular 0 point in that case. But given that sea level is the intended 0, the point about slopes is completely irrelevant, and you can ignore it. | Yes, the text about what floor values mean was mistakenly dropped | in the editing process. | | We propose clarifying text for intermediate floors as follows: That looks fine, and is about what I expected would be the best choice. kre _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] Fwd: Working Group Last Call: Location Co… Ralph Droms
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Robert Elz
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… John Schnizlein
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Robert Elz
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Andrew Daviel
- RE: [dhcwg] Fwd: Working Group Last Call: Locatio… Marc Linsner
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Henning Schulzrinne
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… creediii
- [dhcwg] Unit of Measurement...? James M. Polk
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… John Schnizlein
- [dhcwg] Re: Unit of Measurement...? James M. Polk
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… James M. Polk
- RE: [dhcwg] Fwd: Working Group Last Call: Locatio… Marc Linsner
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Henning Schulzrinne
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Greg Troxel
- [dhcwg] Re: Unit of Measurement...? Henning Schulzrinne
- [dhcwg] Re: Unit of Measurement...? Greg Troxel
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Greg Troxel
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Greg Troxel
- [dhcwg] Re: Unit of Measurement...? Carl Reed
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Dominic Pinto
- Re: [dhcwg] Fwd: Working Group Last Call: Locatio… Carl Reed