On 16-11-16 16:23, Jo wrote:
In bus stations all stops have names like Brussels North Station
Platform 1", so all the names are different, which is why I created
separate stop_area there too.
This is the situation where I create most stop_area relations. For the
69000 other stops around the country I'm less keen on creating them.
Same goes for the stop_area nodes on the ways. Usually which highway is
used can be determined using 'proximity search', even when only nodes of
the ways can be searched for (only nodes have coordinates in OSM).
This is quite a fundamental issue we have here!
I don't have a particular preference for either, but I think we should
follow the same thing worldwide if we want to have any value to data
handlers.
The wiki for stop_area
<https://wiki.openstreetmap.org/wiki/Tag:public_transport%3Dstop_area> says:
"The public_transport=stop_area tag is used as part of a relation to
identify all of the features associated with a public transport
interchange or part of one. A stop area for a simple bus stop with buses
in both directions would consist of two waiting areas or shelters which
can be tagged using (public_transport=platform and/or highway=bus_stop)
and two stop positions (using public_transport=stop_position). More
complex stop areas may include multiple platforms and stop positions and
many associated elements. "
Quoting a simple stop area with two platforms (Pl) and two stop
positions (SP).
I could imagine the main advantage of having one SA for exactly one
SP/Pl pair (+ associated shelters/benches/bins etc) would be that the
relation between them is clear.
However, under the public_transport:version=2 scheme that link is laid
in the route, which contains both a SP and a Pl. Even "weird" situations
can be mapped such as two Pp / one SP (ex. two platforms on a busway
directly opposite each other) or one Pl / two SP (ex. island platform
mapped as node, way or area) by containing all in one SA, then having
the routes include the proper SP/Pl combination
The advantage of a SA combining all SP/Pl is combining as much data on
as high a level as possible (name, operator etc), even though that
doesn't make much sense as I include the name in all three.
One disadvantage of one SA for multiple SP/Pl is the ambiguity of
whether they should be mapped as "one". EG the 4 stops at
<http://www.openstreetmap.org/#map=18/52.37096/4.87043&layers=Tz> have
two called the Bilderdijkstraat (in the De Clercqstraat) and two called
De Clercqstraat (in the Bilderdijkstraat), should they be one or two (or
in Jo's system: 4) stops?
(Interestingly: Openbusmap renders them as two, in a cross, but just one
junction south the similar junction Kinkerstraat/Bilderdijkstraat is
mapped as one...
https://www.öpnvkarte.de/index.html#4.872242074908898;52.36777234510416;18)
So, we should decide one of the two... but which one?
Tijmen
_______________________________________________
Tagging mailing list
Tagging@openstreetmap.org
https://lists.openstreetmap.org/listinfo/tagging
