[Tagging] Verifiability wiki page: "Geometry" section added

[Martin Koppenhoefer]

sent from a phone

> On 1. May 2019, at 10:17, Joseph Eisenberg <joseph.eisenberg at gmail.com> wrote:
> 
> - A tag/value combination and geometry is verifiable if and only if
> independent users observing the same feature would make the same
> observation every time.


every time means under the same circumstances, there are features that are not always present but only on a schedule (opening hours is typically used). Or the coastline changes periodically with the tides. Or intermittent waterways.



> 
> - Objective criteria, clearly documented on the wiki, help to make
> tagging verifiable by individual mappers.
> 
> Examples <new heading>
> 
> Objective Criteria: e.g. Building Height <subheading>


e.g. the building height isn’t sufficiently defined to get to the same results every time you measure it, because it is not defined where to measure it (which ground elevation is the relevant one)

Cheers, Martin