[Tagging] RFC - Feature Proposal - area of steps for pedestrians.

Nick Bolten nbolten at gmail.com
Sat Mar 30 00:13:47 UTC 2019


I like the idea of addressing the area-ness of steps! Thanks for taking the
initiative on this. I have a couple questions and ideas that are hopefully
helpful.

# curb (kerb) lines

What would you think of tagging each step way as a kerb line? e.g., each
step way could be barrier=kerb, kerb=raised, and could have other relevant
kerb tags like kerb:height.

This would make it very easy to know what tags to use for virtually any
curb-like feature in OSM with non-trivial length: make it a curb line. This
would also dovetail with other curb line conventions, such as knowing which
side is higher (the side on the right of the way).

# Determining upper/lower steps + number of members

The example says you would set one step to role=lower and one to
role=upper. Does this mean that the relation effectively applies to a
single step? On a stairway, a single vertical part of a step could of
course serve as both upper and lower, so we'd need more information if a
single relation described the whole stairway.

As a follow-up, what about using the order of relation members, like how
bus routes do? This might make it easier to map whole stairways: order =
ascending (literally). You could then use the role to describe segments if
the stairway splits, though a role like role=1 might be off.

# one-to-one way nodes?

For mapping a step, the proposal says, "Create 2 ways, one for the upper
part of the steps, another for the lower. They should have the same number
of nodes and have the same direction."

I'm wondering why they need to have the same number of nodes. It seems to
me that the Queluz National Palace example would actually be impossible to
map as a single area this way, since it splits into two stairways at the
top. But I might be misunderstanding the proposal.

# In combination with one or more highway=steps ways

It's fairly complicated to route on areas, and this one in particular seems
even moreso. What would you think of recommending mapping both an area
(which is good for rendering/barriers/advanced routing) and one or more
highway=steps (which is good for routing + network analysis + attaching to
a building entrance) ways?

Best,

Nick

On Thu, Mar 28, 2019, 8:06 PM Warin <61sundowner at gmail.com> wrote:

> Hi,
>
> This one has been sitting for a long while! Still not certain about some
> aspects of it.
>
> See what you make of it.
>
> https://wiki.openstreetmap.org/wiki/Proposed_features/Area-steps
>
>
> Discussion here for preference.
>
>
> _______________________________________________
> Tagging mailing list
> Tagging at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/tagging
>
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