On 8/8/20 10:54 am, Andy Townsend wrote:
Hello,
This is a question that actually arose out of a "how to tag" argument
that's come to the attention of the DWG in the USA, but it's actually
easy to describe in terms of data in the UK that I'm familiar with, so
I'll do that.
https://www.openstreetmap.org/node/12004813 is a
"public_transport=stop_position" for a local station and is part of
https://www.openstreetmap.org/relation/6396491 among other relations.
The problem is that train lengths vary, and there are a number of stop
positions, each of which are actually signed on the platform for the
benefit of the drivers. From memory I think that there's at least a
2-car stop, a 4 car stop and 6/8 and 10/12 car stops. The problem is
that the current node doesn't correspond to any of them.
Why is the front of the vehicle (bus, train, ferry.. and possibly
others) mapped?
Would it not be better to map the thing most usefull to most people?
That would be where passengers get on/off, on multiple exit vehicles
like train then the average of these positions could be used.
Trains here of varying lengths tend to place the middle of the train at
the middle of the platform - thus it is consistent for any train length.
The only exceptions are where the platform is shorter than the train so
the train stops such that the designated car/carriage is centered on the
platform - thus it is still a consistent location for OSM.
Maybe the "correct" answer is none of the above? With a "local
mapper" hat on I've managed to avoid PTv2 since it basically isn't
relevant anywhere I normally map things, largely because I don't tend
to do that near any actual public transport infrastructure, but with a
DWG hat on I haven't been able to avoid the question, hence me asking
here.
I have mapped a few bus routes and 'corrected' some PTV2 trains... but
I'd not hold them up as 'best' examples... only ones that are 'better'
than what was there before and probably the simplest way that I could
see to do it.
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