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

[Patrick Agin]

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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