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Re: [Geopriv] Progressing the draft draft-thomson-geopriv-confidence-03

Martin Thomson <martin.thomson@gmail.com> Wed, 31 July 2013 13:25 UTC

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Date: Wed, 31 Jul 2013 15:25:49 +0200
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From: Martin Thomson <martin.thomson@gmail.com>
To: Henning Schulzrinne <hgs@cs.columbia.edu>
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Subject: Re: [Geopriv] Progressing the draft draft-thomson-geopriv-confidence-03
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> On 31 July 2013 15:06, Henning Schulzrinne <hgs@cs.columbia.edu> wrote:
>> I'm assuming that's because errors do not have an approximately normal (Gaussian) distribution for some or all location determination methods?
>
> In part.  Gaussian distributions are actually becoming the exception
> rather than the rule.
>
> Also, it's possible that provisioning errors contribute a greater than
> 5% reduction in confidence.  Getting good databases is a really hard
> operational problem.

I should expand on that.  A lot of location determination relies on
having good databases of reference locations, for example cell sites.
Network operators spend a lot of time and effort on maintaining these
databases, but errors do inevitably occur.

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