[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

> 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

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
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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