On 2019-05-03 12:09, Dave F via Talk-transit wrote:
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.
It's a logical platform whether it physically exists or not. It's
pretty well established that using a platform node for a mere pole is
valid. People wait there to be picked up, regardless of the actual
surface type (which can change over time anyway).
A platform:
https://s0.geograph.org.uk/geophotos/04/76/30/4763016_2416f5ee.jpg
Not a platform:
https://i.pinimg.com/originals/38/90/a0/3890a0f451e1a6900d174b29125b3c80.jpg
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.:
https://www.openstreetmap.org/node/469760546#map=19/51.51026/-0.18630
I'd be fine with saying that highway=bus_stop implies
public_transport=platform, except that some mappers put bus stops on the
way instead of beside the way and argue with anyone who tries to fix
them, so in those areas, separate nodes for the platform had to be
added.
Ditto for railway=platform implying public_transport=platform, and it
doesn't seem to have the same problem. I'm not sure for other modes
since I've never dealt with them.
If we could all agree on this, we'd just need to change the
documentation--and go fix thousands of bus stops that are in the wrong
place.
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.
It doesn't make a difference for routing.
If a platform is large enough that it matters for rendering, then
someone needs to go back and draw the platform as an area. Same as any
other structure where someone puts a node as a "temporary" marker. It's
better than nothing, but it can be improved.
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.
Walkways as in places where people walk. The router needs to give me
directions down the sidewalk or whatever to where I wait for the bus.
If the only node is on the highway, am I supposed to stand in the middle
of the highway until I get hit by the bus? No, it should route me to
the platform beside the highway.
But the bus stays on the way, so it can't stop at a platform correctly
off the way. That's where the stop position comes in, and the supposed
need to link the two together.
Markus previously said "OsmAnd Is able to navigate with routes
consisting only of highway=bus_stop beside the road."
I assuming they're calculating the stop position based on geometry,
which should work fine in most cases. But if an explicit stop position
does exist, they should use that instead.
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?
Notice what you did there: the platform tag "represent[s] a place where
vehicles stop". That's the entire argument over bus stops in a
nutshell, which led to the redundant tagging.
S
--
Stephen Sprunk "Those people who think they know everything
CCIE #3723 are a great annoyance to those of us who do."
K5SSS --Isaac Asimov
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