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

Tobias Knerr osm at tobias-knerr.de
Sun Apr 28 11:38:13 UTC 2019


On 28.04.19 11:43, Joseph Eisenberg wrote:
> Please suggest any improvements to the wording or corrections:
> https://wiki.openstreetmap.org/wiki/Verifiability#Geometry

I'm afraid I can't support the addition of this new rule.

Yes, it's often not possible to agree on a precise border for these
features. But nevertheless, there are typically areas that are
definitely part of them, and other areas there are definitely not part
of them.

The above is verifiable geographic information, so it ought not be
off-limits for OSM. I've always thought of mapping features with fuzzy
boundaries as an unsolved challenge for our data model, not as something
that should be categorically excluded from OSM. One could imagine, for
example, a relation containing two polygons for the feature's "minimum"
and "maximum" extent (describing the parts of the world that are
verifiably part of/not part of the feature), with a grey area of
uncertainty in between.

With your recommended solution of placing a node "near the center of the
feature", capturing this useful knowledge is not possible. It also
doesn't make logical sense to me: If it were indeed impossible to
verifiably establish even an approximate boundary of the feature, how
can we verifiably establish the feature's center?

Tobias



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