[Geopriv] questions on uncertainty

[Nick Doty <[e-mail]>]

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