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

creediii@mindspring.com Thu, 03 July 2003 16:32 UTC

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Message-ID: <00da01c34178$1f3bce80$0101a8c0@pavilion>
To: Henning Schulzrinne <hgs@cs.columbia.edu>, Marc Linsner <mlinsner@cisco.com>
Cc: 'Andrew Daviel' <andrew@daviel.org>, dhcwg@ietf.org, geopriv@mail.apps.ietf.org
References: <000501c340ab$46784be0$220d0d0a@mlinsnerzk7abh> <3F03854D.2060608@cs.columbia.edu>
Subject: Re: [dhcwg] Fwd: Working Group Last Call: Location Configuration Information for GEOPRIV
Date: Thu, 03 Jul 2003 08:30:29 -0600
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I support Henning on the requirement for a UoM. This is why I referenced the
OGC recommendation paper on Units of Measurement. Many geospatial
technologies today - in order to make best use of coordinates - need to know
the UoM.

Regards

Carl

----- Original Message -----
From: "Henning Schulzrinne" <hgs@cs.columbia.edu>
To: "Marc Linsner" <mlinsner@cisco.com>
Cc: "'Andrew Daviel'" <andrew@daviel.org>; <dhcwg@ietf.org>;
<geopriv@mail.apps.ietf.org>
Sent: Wednesday, July 02, 2003 7:22 PM
Subject: Re: [dhcwg] Fwd: Working Group Last Call: Location Configuration
Information for GEOPRIV


> Marc Linsner wrote:
>
>
> > For those who are struggling with this, it is not our intention to
> > (re)define zero altitude.  We are simply attempting to provide a
> > mechanism for people who understand altitude values to share them
> > amongst each other via a standardized mechanism.  If one were to receive
> > such data, it is assumed that they will understand the definition of
> > zero altitude within the jurisdiction/authority from which the data
> > originated.  Some map datum define zero altitude, some don't.  For those
> > that don't, we define mean low tide.
>
> Like the datum, what's wrong with providing an indication of the unit of
> the measurement?
>
> I think it is generally a bad idea to assume that all parties along a
> chain of transmission know what the data meant initially. This only adds
> a modest number of bits to the format, given that the number of choices
> appears to be on the order of two.
>


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