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

Tue May 1 15:23:13 UTC 2018

Hi Patrick,

  Train ways are typically tagged directly with `train=<something>`.  Bus
routes are typically not tagged directly on a way itself (because busses
run on roads shared with other traffic), but rather, the way is a member of
a bus route relation.

daniel

On Tue, May 1, 2018 at 8:05 AM, Patrick Agin <agin.patrick at gmail.com> wrote:

> I understand but my question was (sorry if it was unclear), why is it
> different between train and bus?
>
> 2018-05-01 10:02 GMT-04:00 Michal Palenik <michal.palenik at freemap.sk>:
>
>> On Tue, May 01, 2018 at 09:30:36AM -0400, Patrick Agin wrote:
>> > Thanks Michal and Daniel for your help, I defined my subway profile and
>> it
>> > works well.
>> >
>> > Michal, can I ask you why you use this kind of code for the train
>> profile:
>> > train = way:get_value_by_key('train');
>> > if ( not data. train or data. train =='') then return false;
>>
>> this checks way's tags
>>
>> >
>> > and this kind of code for the bus:
>> > bus = get_from_rel(relations, way, "route", "bus", "route");
>> > if ( not data.bus =='') then return false;
>>
>> this one checks relations' tags (of relations that the way is a member
>> of)
>>
>> > Aren't they defined the same way in osm data?
>> > Patrick
>> >
>> > 2018-04-30 13:26 GMT-04:00 Patrick Agin <agin.patrick at gmail.com>:
>> >
>> > > Thanks again Michal I'll try it soon with subway instead of bus. Out
>> of
>> > > curiosity, why do you define highway in process_way function? It does
>> not
>> > > seem to be used elsewhere.
>> > >
>> > > 2018-04-30 13:03 GMT-04:00 Michal Palenik <michal.palenik at freemap.sk
>> >:
>> > >
>> > >> 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)
>> > >> > > > >>>
>> > >> > > > >>> _______________________________________________
>> > >> > > > >>> OSRM-talk mailing list
>> > >> > > > >>> OSRM-talk at openstreetmap.org
>> > >> > > > >>> https://lists.openstreetmap.org/listinfo/osrm-talk
>> > >> > > > >>>
>> > >> > > > >>>
>> > >> > > > >>
>> > >> > > > >> _______________________________________________
>> > >> > > > >> OSRM-talk mailing list
>> > >> > > > >> OSRM-talk at openstreetmap.org
>> > >> > > > >> https://lists.openstreetmap.org/listinfo/osrm-talk
>> > >> > > > >>
>> > >> > > > >>
>> > >> > > > >
>> > >> > > > > _______________________________________________
>> > >> > > > > OSRM-talk mailing list
>> > >> > > > > OSRM-talk at openstreetmap.org
>> > >> > > > > https://lists.openstreetmap.org/listinfo/osrm-talk
>> > >> > > > >
>> > >> > > > >
>> > >> > >
>> > >> > > > _______________________________________________
>> > >> > > > OSRM-talk mailing list
>> > >> > > > OSRM-talk at openstreetmap.org
>> > >> > > > https://lists.openstreetmap.org/listinfo/osrm-talk
>> > >> > >
>> > >> > >
>> > >> > > --
>> > >> > > michal palenik
>> > >> > > www.freemap.sk
>> > >> > > www.oma.sk
>> > >> > >
>> > >> > > _______________________________________________
>> > >> > > OSRM-talk mailing list
>> > >> > > OSRM-talk at openstreetmap.org
>> > >> > > https://lists.openstreetmap.org/listinfo/osrm-talk
>> > >> > >
>> > >>
>> > >> > _______________________________________________
>> > >> > OSRM-talk mailing list
>> > >> > OSRM-talk at openstreetmap.org
>> > >> > https://lists.openstreetmap.org/listinfo/osrm-talk
>> > >>
>> > >>
>> > >> --
>> > >> michal palenik
>> > >> www.freemap.sk
>> > >> www.oma.sk
>> > >>
>> > >> _______________________________________________
>> > >> OSRM-talk mailing list
>> > >> OSRM-talk at openstreetmap.org
>> > >> https://lists.openstreetmap.org/listinfo/osrm-talk
>> > >>
>> > >
>> > >
>>
>> > _______________________________________________
>> > OSRM-talk mailing list
>> > OSRM-talk at openstreetmap.org
>> > https://lists.openstreetmap.org/listinfo/osrm-talk
>>
>>
>> --
>> michal palenik
>> www.freemap.sk
>> www.oma.sk
>>
>> _______________________________________________
>> OSRM-talk mailing list
>> OSRM-talk at openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/osrm-talk
>>
>
>
> _______________________________________________
> OSRM-talk mailing list
> OSRM-talk at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/osrm-talk
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/osrm-talk/attachments/20180501/2aade261/attachment-0001.html>