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

[bkil]

👍


On Sun, Apr 28, 2019 at 11:44 AM Joseph Eisenberg <
joseph.eisenberg at gmail.com> wrote:

> I've added a new section to the Verifiability wiki page about mapping
> features with ways or areas when these geometries are not verifiable.
>
> This has been discussed here several times in the past few months, in
> regards to tags like natural=bay, natural=strait, place=*, and
> proposals like natural=mesa.
>
> Please suggest any improvements to the wording or corrections:
> https://wiki.openstreetmap.org/wiki/Verifiability#Geometry
>
> "Linear ways and areas can be non-verifiable if the geometry cannot be
> demonstrated to be true or false by another mapper.
>
> "For example, a valley can be thought to refer to the whole area
> between mountain ridges, or only to the flat bottom of the valley. In
> this case, drawing the natural=valley as an area will usually not be
> verifiable, because two different mappers would draw a very different
> geometry for the same feature. Many settlements have non-verifiable
> borders, especially in rural areas.
>
> "A place=hamlet often lacks verifiable borders. Hamlets in farming
> areas often have scattered houses and farms extending outward for
> several kilometers. In this case the approximate center of the place
> may be well-know, but the outer limits are not clearly determined, so
> mapping as an area is not verifiable.
>
> "A natural=ridge can be often be verifiably mapped as a linear way
> along the line of the ridge crest. It cannot be verifiably mapped as
> an area, because it would not be clear how far down the slopes the
> area of the ridge extends.
>
> "Many features which are not verifiable as ways or areas can be mapped
> with a single node near the center of the feature instead. In this
> case it can be agreed that this node is within the feature, even
> though the outer limits of the feature cannot be precisely
> determined."
>
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