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

Tue May 1 13:30:36 UTC 2018

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;

and this kind of code for the bus:
bus = get_from_rel(relations, way, "route", "bus", "route");
if ( not data.bus =='') then return false;

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)
>> > > > >>>
>> > > > >>> _______________________________________________
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>> > > > >>> OSRM-talk at openstreetmap.org
>> > > > >>> https://lists.openstreetmap.org/listinfo/osrm-talk
>> > > > >>>
>> > > > >>>
>> > > > >>
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>> > > > >>
>> > > > >
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>> > > > >
>> > >
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>> > >
>> > >
>> > > --
>> > > michal palenik
>> > > www.freemap.sk
>> > > www.oma.sk
>> > >
>> > > _______________________________________________
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>> > > OSRM-talk at openstreetmap.org
>> > > https://lists.openstreetmap.org/listinfo/osrm-talk
>> > >
>>
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>>
>>
>> --
>> michal palenik
>> www.freemap.sk
>> www.oma.sk
>>
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>
>
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