[Tagging] Mapping curb (kerb) lines as the home of curb, parking, etc information

althio althio.forum at gmail.com
Tue Mar 5 09:25:44 UTC 2019


Tobias Knerr:

> Can we please first define a solution (e.g. a relation) for connecting
> such separately mapped components of a road to the highway?
>
> Painting lines next to each other fails to express the important
> information that this kerb/sidewalk/cycleway is part of that highway
> over there. Such missing information may be easily guessed by a human
> viewer, but it's currently not available in a machine-readable form.
>

If they are next to each other, you have already some of the information
because we use a geographic database with coordinates of the "painted
lines" (and not a pure relational database).
I would say that 99%+ of cases could be treated automatically once data is
loaded in a geographic tool like a pgsql-PostGIS database.
Advanced PostGIS users, please correct me if I am wrong.

Some points are also made in
https://wiki.openstreetmap.org/wiki/Relations/Relations_are_not_Categories

> The "relations" [...] are meant to model a close (and usually local)
relation between objects, [...] as in: These fifteen parts together make up
so-and-so road. [...] Our database is a spatial database; this means that
it has intrinsic knowledge about the location of objects. [...] A good
example for a valid and useful grouping is the "route
<https://wiki.openstreetmap.org/wiki/Relation:route>" relation, where
multiple ways are connected to form a cycle route or a walking route or
something else; a way may be part of any number of routes so this cannot be
solved by tagging the way with "route
<https://wiki.openstreetmap.org/wiki/Key:route>=xxx".

Other than that, you already have relation tools existing if you absolutely
need them, you could either pick or extend
https://wiki.openstreetmap.org/wiki/Relation:street or
https://wiki.openstreetmap.org/wiki/Relation:associatedStreet
Although it feels like that are needed for edge cases of addresses only.
I do not think we need relations at the moment to assign a pavement, a
kerb/curb, a lamppost unambiguously to a street. These objects are related
to the nearest highway or the nearest crossing between several highways
(use buffers accordingly in the pre-treatment).

-- althio
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