[Talk-transit] Ideas for a simplified public transportation scheme
johan.wiklund at entur.org
Fri May 3 20:48:52 UTC 2019
In response to:
> Please show me a router which uses platforms as I'm struggling to see the benefits atm.
> This reinforces my point about misappropriation of tags. A platform is a physical construction higher than the surrounding ground to allow easier boarding.
> A platform:
> Not a platform:
We use public_transport=platform abundantly in routing with OTP, and it is a key component in specifying the origin of walk links. We use it as an area, or a way. We need these to make direct contact between our stops (separate database) and the foot-routing network of OSM.
I further see no problem in extending the usage of the platform (public_transport=platform) to any waiting area for public transport. To force correct word description would force one to use terms like "street_waiting_area" "dirt_pit", "ditch" or "sidewalk" which would only be hairsplitting. If the usage of the word platform is misappropriation, I think it is the wording in the scheme that is too narrowly defined, rather than the widespread usage being wrong.
However, don’t get me wrong. I don’t really care what it's called as long as there is an area which can represent where passengers wait, and to which public transport vehicles arrive. This is of course the needs of our own journey planner, and we have no stake in the wider public transport scheme of OSM. I just wanted to show that there are indeed routers which use the platforms, and have great emphasis on their usage.
In case you were wondering which router I'm talking about: https://en-tur.no/ (https://github.com/entur/opentripplanner)
Sincerely (and possibly missing a few points because I haven't been reading the whole discussion),
From: Dave F via Talk-transit <talk-transit at openstreetmap.org>
Sent: fredag 3. mai 2019 19.09
To: Public transport/transit/shared taxi related topics <talk-transit at openstreetmap.org>; selfishseahorse at gmail.com
Cc: Dave F <davefoxfac63 at btinternet.com>
Subject: Re: [Talk-transit] Ideas for a simplified public transportation scheme
(This amalgamates replies to Markus's points in his last post.)
On 30/04/2019 18:34, Stephen Sprunk wrote:
> A platform is where people wait to board; if they stand at a pole
> (typical for buses), then the pole is logically the platform.
This reinforces my point about misappropriation of tags. A platform is a physical construction higher than the surrounding ground to allow easier boarding.
Not a platform:
If (& I believe it's a big if), a separate tag is required to as you & Markus suggest, one with a unique, non-confusing value should be used.
Many public_transport=platform are tagged on the same node as highway=bus_stop. They have no raised construction Therefore they're redundant - routing can use the bus stop tag for the "stop node beside the road" as Markus described it.:
> That's easily distinguished from large platforms because it's a node
> rather than a way/area.
Not really. To save time, contributors occasionally combine tags onto a single object: litter_bins, shelters, benches *&* raised platforms in the case of bus stops. I'm not saying it's the correct/best way to map, but it happens.
> I think the idea was that nobody _could_ build routers with the data
> we had, which was inconsistently tagged between areas and sometimes
> even between mappers in the same area.
This maybe true, but as I point out in my previous post, adding extra tags only masks the problems. The "inconsistencies" should be corrected.
> If you're trying to construct a route that involves walking to a bus
> stop, riding the bus to another stop, and then walking some more, then
> you need a linkage connecting the bus route (using stop positions)
> with the walkways (using platforms). I'm not saying that's the only
> way to do it, but it's the only way that was proposed.
Do you have an example as I'm unsure what you mean by 'walkways' and platforms are disconnected from the bus routes, as are bus stops, so, as I said above, PT can use bus stops.
Markus previously said "OsmAnd Is able to navigate with routes consisting only of highway=bus_stop beside the road."
So, to be absolutely sure we're singing from the same hymn sheet, are we agreed that 'public_transport=platform' tag to represent a place where vehicles stop to allow passengers to alight, is redundant in PT as another, existing, more prevalent tag - 'highway=bus_stop' can be used instead?
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