I support the idea of uncertainty and would be willing to help.
On the point of metres uncertainty, that's how we do it. For one thing, that makes it more usable by people.
> -----Original Message-----
> From: Ivan Shmakov [mailto:oneingray@gmail.com]
> Sent: Tuesday, 28 July 2009 10:42 AM
> To: geopriv@ietf.org
> Cc: Thomson, Martin; Alexander Mayrhofer; Ivan Shmakov
> Subject: Re: [Geopriv] geo: URI: what about uncertainty?
>
> >>>>> Thomson, Martin <Martin.Thomson@andrew.com> writes:
>
> [...]
>
> >> Then, what is the "dimension" of those values? Is is a circle, or a
> >> sphere? In "natural" space, or in the "projected" space (lat/lon
> >> circle, which would definitely not give a circle in "real world"?)
> >> What is the dimension (meters, inches, degrees?).
>
> > SI units are good.
>
> ... Except that these would be quite hard to apply to the
> (latitude, longitude) pairs as specified by the geo: URIs.
>
> The location specification reading ``53 degrees latitude
> plus/minus 1000 meters, ...'' seems rather unsound to me. I'd
> expect the deltas' dimensions to align with the corresponding
> axes' dimensions, as per the CRS used.
>
> FWIW, the coordinates and the respective deltas will define an
> ellipsoid in the projected space where the object is to be found
> with the specified confidence (e. g., 95%.)
>
> Note that the ellipsoid defined in one projected space may
> correspond to an arbitrary complex shape in some other projected
> space. But I'd leave this complexety off the geo: scheme
> specification.
>
> [...]
>
> --
> FSF associate member #7257
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