[OSRM-talk] How to force match service to return public transport routes only?

Mon Apr 30 17:03:05 UTC 2018

On Mon, Apr 30, 2018 at 12:57:42PM -0400, Patrick Agin wrote:
> Thanks a lot to both of you. Michal, can I ask you two things:
> what's the purpose of adding tram and train to excludable?

generally to ignore trains when they do not have a common ticketing
scheme. 

> and about get_from_rel(relations, way, "route", 'bus', "route") line, is
> 'bus' a reserved OSM word or is it defined by you? 

function get_from_rel(relations, way, "route", 'bus', "network")
will find first/random relation of route=bus which the way is a member
of, and then returns tag "network".

see also
https://github.com/Project-OSRM/osrm-backend/issues/5032

> I ask the question
> because I would like to manage subway routes.
> Patrick
> 
> 2018-04-30 12:48 GMT-04:00 Michal Palenik <michal.palenik at freemap.sk>:
> 
> > hi, I have it working
> > https://github.com/FreemapSlovakia/freemap-routing/blob/master/oma-bus.lua
> > (and train profile below)
> >
> > michal
> >
> > On Mon, Apr 30, 2018 at 09:26:22AM -0700, Daniel Patterson wrote:
> > > Hi Patrick,
> > >
> > >   Nobody has written a "How to make a public transport profile" document
> > > for OSRM, you'll have to piece it together from examples and reading
> > code.
> > >
> > >   That said, the "testbot" profile here:
> > > https://github.com/Project-OSRM/osrm-backend/blob/master/
> > profiles/testbot.lua
> > >
> > >   is fairly simple.  There are 3 functions: `process_node`,
> > `process_way`,
> > > and `process_turn`.  The `process_way` function is run for every way in
> > the
> > > OSM file you input, and it decides whether to include it in the routing
> > > graph (by setting properties on the `result` object), or to exclude it
> > (by
> > > simply returning without doing any work).
> > >
> > >   As someone else pointed out in another thread, the `car.lua` profile is
> > > pretty complex - it's developed over time, and has a lot of logic in it
> > > that makes it hard to understand.  I'd start with the testbot profile
> > > above, and add the stuff you think you need.
> > >
> > >   You might also want to take a look at
> > > https://github.com/Project-OSRM/osrm-frontend/tree/gh-pages/debug which
> > is
> > > a web viewer that can show you what the routing graph looks like.
> > >
> > > daniel
> > >
> > > On Mon, Apr 30, 2018 at 8:39 AM, Patrick Agin <agin.patrick at gmail.com>
> > > wrote:
> > >
> > > > Thanks again Daniel. Could you just give me an example (with a snippet
> > of
> > > > code maybe) of a good implementation of point 1 (Lua profile that only
> > > > includes public transport ways in the graph). I just don't have any
> > clue
> > > > about implementing this and I'm not aware of any docs that could help
> > me
> > > > with that.
> > > > Patrick
> > > >
> > > > 2018-04-30 11:30 GMT-04:00 Daniel Patterson <daniel at mapbox.com>:
> > > >
> > > >> Hi Patrick,
> > > >>
> > > >>   This could be tricky, depending on how long the traces you're
> > trying to
> > > >> match are.
> > > >>
> > > >>   The OSRM Lua profiles basically act as a filter - they decide which
> > > >> ways from OSM are included in the routing graph, and assign
> > properties to
> > > >> edges in the graph.
> > > >>
> > > >>   The map-matching algorithm will try to snap your coordinate list to
> > the
> > > >> most likely path across the routing graph.
> > > >>
> > > >>   In order to only snap to public transport paths, you'll need:
> > > >>
> > > >>     1) A Lua profile that only includes public transport ways in the
> > > >> graph.
> > > >>     2) A way to ensure that all the public transport paths are
> > connected
> > > >> together (this could be difficult without including lots of extra
> > stuff you
> > > >> don't want in the graph)
> > > >>     3) GPS traces that are somewhat close to the actual paths
> > themselves,
> > > >> as mapped in OSM
> > > >>
> > > >>   (2) could be the really tricky bit here.  If the public transport
> > paths
> > > >> are not connected, then any GPS trace you have that spans two public
> > > >> transport routes (say, a bus change, or a train change) but those
> > routes
> > > >> aren't actually connected by the graph, will cause problems with the
> > > >> map-matching algorithm.
> > > >>
> > > >> daniel
> > > >>
> > > >> On Mon, Apr 30, 2018 at 7:23 AM, Patrick Agin <agin.patrick at gmail.com
> > >
> > > >> wrote:
> > > >>
> > > >>> Hi everyone,
> > > >>> I'm trying to define a profile to force match service to take public
> > > >>> transport routes only. I tried to add residential in excludable so I
> > can
> > > >>> add exclude=residential at query time but it does not change
> > anything to
> > > >>> the returned answer. Can someone help or point me towards
> > documentation
> > > >>> that could help (I've read profile.md but it does not help me much).
> > > >>> Thanks a lot,
> > > >>> Patrick (newbie with osrm)
> > > >>>
> > > >>> _______________________________________________
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> > > >>>
> > > >>>
> > > >>
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> > > >
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> >
> > --
> > michal palenik
> > www.freemap.sk
> > www.oma.sk
> >
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> > https://lists.openstreetmap.org/listinfo/osrm-talk
> >

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-- 
michal palenik
www.freemap.sk
www.oma.sk