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Re: [Geopriv] Some comments on draft-thomson-geopriv-uncertainty-08

Brian Rosen <br@brianrosen.net> Fri, 08 November 2013 17:57 UTC

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From: Brian Rosen <br@brianrosen.net>
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Date: Fri, 08 Nov 2013 09:57:45 -0800
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To: Martin Thomson <martin.thomson@gmail.com>
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Subject: Re: [Geopriv] Some comments on draft-thomson-geopriv-uncertainty-08
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It’s defined differently.

If I send you a circle, am I specifying a point with uncertainty or a circular location?  There is a difference: in the former, I am telling you that I am specifying circular uncertainty.  In the latter, you don’t know.  A circle with a radius of 99 could be a location report with a circle of radius of 99 with no uncertainty, or it could be a circle with a radius of 33 and an uncertainty of radius 99.
In the former, since you have not specified uncertainty, I don’t know a lot about where the target is. 

MLP defines the radius as uncertainty.  5491 does not.

Brian

On Nov 8, 2013, at 9:47 AM, Martin Thomson <martin.thomson@gmail.com> wrote:

> On 8 November 2013 09:33, Brian Rosen <br@brianrosen.net> wrote:
>> I think E2 and MLP report position AND they report uncertainty by describing
>> the position as a point, and the uncertainty as the radius of a circle or
>> ellipse.
> 
> That's not the case.
> 
> Wikipedia has the DTDs, which show that it's functionally identical to
> what is in RFC 5491.
> 
> http://en.wikipedia.org/wiki/Mobile_Location_Protocol

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