[Tagging] rail routes: how are platforms and stops associated (rail question 2)

[Bjoern Hassler]

Hi Tijmen,

many thanks. Yes, I understand the wiki that way too, i.e. suggest one
stop_area for the station and associated infrastructure.

Follow up question: In the relation you have
 .../stop/platform/stop/platform/stop/platform/... - would you agree with
the convention that the stop comes first, then the platform? It's of course
arbitrary, but e.g  in JOSM, the stop name would then come first, followed
by the platform (possibly unnamed), so it possibly makes more sense than
the other way round.

Bjoern

On 11 May 2017 at 22:45, Tijmen Stam <mailinglists at iivq.net> wrote:

> On 10-05-17 18:59, Bjoern Hassler wrote:
>
>> Hello again,
>>
>> In an  osm:relation:route
>> <https://wiki.openstreetmap.org/wiki/relation:route> (type=route,
>> route=train/...), you have both platforms and stop positions. How is a
>> particular platform associated with a stop that serves it?
>>
>> E.g. for public transport routing, you'd walk (highway=footway) to a
>> platform (public_transport=platform), at which point you'd change to a
>> train stopping at a stop (public_transport=stop_position). How would the
>> routing algorithm know that the platform is associated with the stop?
>>
>> Is there an existing mechanism or convention, e.g. a tag on the platform
>> that indicates the stop, or both tagged with the same name or similar?
>>
>> Thanks!
>> Bjoern
>>
>> PS I've noticed that sometimes the stop position is at the far end of a
>> platform (i.e. the two stop positions are at opposite ends of the
>> station). Maybe that's so that an association can be made?
>>
>
> Answering your grand question:
>
> As I interpret the wiki, it is the route-relation that ties together the
> stop_position with the platform, by including them as a pair per "halt".
>
> Imagine the "renderer" is a transit simulator that simulates a journey
> from your home to somewhere via "Green line" that stops on track 1
> (platform A), then the route relation of the green line contains both the
> stop_position (a node on track 1) and the platform (platform A).
> It would then plot a walking route to platform A, then transfers you into
> the train (on track 1) and along the route.
>
> I know of people who use a stop_area-relation for each
> stop_position/platform pair, which then could be used to tie stop_position
> and platform together, but that is not how I interpret the wiki.
> I use one stop_area for a whole station.
>
> Tijmen/IIVQ
>
>
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