Re: [Geopriv] questions on uncertainty

[James Winterbottom <[e-mail]>]

Hi Nick,

123 Mian st may well be a 1/4 acre block. If it is a two story house, are you on the ground floor or the first floor, which room in the house? Answers to these questions reduce the uncertainty. Does that help a bit?

On the second point I will defer to Martin.

Cheers
James



On 7 Nov 2013, at 5:29 pm, Nick Doty <[e-mail]> wrote:

> A couple comments from reading documents before tomorrow's meeting:
> 
> Re draft-thomson-geopriv-uncertainty-08
> 
>> Civic addresses [RFC5139] inherently include uncertainty, based on
>>   the area of the most precise element that is specified.
> 
> Is that correct? If I'm trying to express a point location, then a civic address will include that area-based level of uncertainty, but is PIDF-LO only used to express points? If I tell you that I live at 123 Main St., there is no uncertainty. (Similarly: "I'm from Oakland.")
> 
>>   Note:  The centroid of a concave Polygon or Arc-Band shape is not
>>      necessarily within the region of uncertainty.
> 
> Indeed! This is one of the reasons that in different use cases, different point conversions might be appropriate. Is there a particular reason for geopriv to precisely document the centroid method when implementers will have their own reasons to use different algorithms?
> 
> Looking forward to chatting in person.
> —Nick
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