On 04/03/19 06:12, Nick Bolten wrote:
A recent post on the Mapillary blog
(https://blog.mapillary.com/update/2019/02/12/potential-for-openstreetmap-to-seize-the-curb.html)
reminded me of my long-running wish to have more curb lines mapped, so
I wanted to get a discussion started to see what people think of
mapping curbs as ways.
The short version is this: if we put kerb=* on a line and call it its
own feature, what's the best tagging schema to use and what kind of
additional information is appropriate? Personally, I'd like to use
(and recommend) the existing kerb=* tags around blocks and potentially
add parking information.
Potential mapping and data use cases:
- Public parking data: curbs are already marked with parking /
stopping information, and when motor vehicles stop at a curb they are
meant to follow the local regulations regarding access. Curbs seem
like a natural place to store this information: you can split the way
whenever the parking situation differs or where there are dedicated
parking slots. It is attractive to associate streets with parking
information, but if one were to split street ways whenever parking
information changed, every city block would become an
incomprehensible, split-up mess.
- Streets as areas: there are a few schemas out there about mapping
streets and related features as areas, primarily for rendering
purposes. Mapping the curb is fully compatible with, and part of,
these proposals, and could provide a means of building up to fully
mapping contiguous areas.
- Pedestrian crossings. I would be very excited to map out kerb=* ways
around every block I see, because it makes QA (and even safe,
semi-automated edits) for pedestrian accessibility so easy. All a
validator has to do is check that a highway=footway crosses a kerb=*
way and lacks its own kerb=* node. This is similar to the validators
already used in JOSM and iD that check for things like a footway or
street intersecting a building, reminding users to use covered=* or
tunnel=*.
- Pedestrian islands. These are often just an assembly of raised curbs
intended to protect pedestrians that are doing a multi-part crossing
of a street or streets.
- Opportunity to merge with + simplify micromapped stairs: what are
stairs but a series of carefully-raised "curbs"? I've seen various
proposals regarding how one might map large, beautiful, public
stairways. This is a whole can of worms, but the information in
describing a physical curb is essentially the same as describing any
'stuff on the right is higher than stuff on the left' interface.
Thoughts?
Err ... no.
Curbs and guttering are road edges. Detail them as part of the road/foot
path.
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