Hello,
I work on public transport journey planning software. We use OSM data heavily,
but primarily for the parts of journeys outside public transportation: the
first- or last-mile or transfer segments. In my experience we rarely use OSM
data directly for the transit part of routing. We use data loaded from GTFS or
Netex feeds, which are provided by the public transportation operators or
regional authorities. Public transport entities or tags from OSM are generally
used as a sanity check or backup source of information, for example to
determine from which road it is easiest to reach a stop, when that stop is
physically located halfway between two candidate roads.
These data sources do have a concept of stop hierarchies. GTFS groups stops
into stations, and Netex allows more complex hierarchies. If data of this kind
are imported into OSM, or if the data in OSM are expected to resemble the
conceptual model used in exchanging public transport data, then I'd expect
these groupings to be present. I can confirm that the groupings are meaningful
and useful in routing applications, both when finding paths and when presenting
those paths to the end user.
We mostly work in places where operators provide detailed data about their
services. In places where there is no such official data, or where mappers have
created a better data set than the official one, someone might want to route on
the user-generated data in OpenStreetMap. The station groupings would be useful
in that case. Even for purely visual (non-routing) map display, I can imagine
the station groupings would assist in layout and labeling.
Regards,
Andrew
> On 1 Aug 2019, at 15:11, Joseph Eisenberg wrote:
>
> I'm trying to find out if the type=public_transport +
> public_transport=stop_area relation or *=stop_area_group relation is
> used by any developer or database user.
>
> These relations are supposed to group together features like all the
> platforms in a bus station or train station. However, it seems like
> these relations may not be necessary or useful for routing
> applications.
>
> Has anyone looked into them or know of any current use cases?
>
> Joseph
>
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