[Marble-devel] Public Transport Routing

Dennis Nienhüser earthwings at gentoo.org
Fri Dec 16 13:36:24 UTC 2011

See also [1] and the resources it links to, e.g. [2], [3]


[1] http://wiki.openstreetmap.org/wiki/Public_Transport#Service_routes
[3] https://github.com/openplans/OpenTripPlanner/wiki/

On 14.12.2011 15:59, Dennis Nienhüser wrote:
> Hi Florian,
> On 14.12.2011 15:33, Florian Eßer wrote:
>> Hi,
>> are there any plans for some kind of public transport routing yet?
> I had some thoughts of it, but no concrete plans yet. Help is 
> appreciated, it will be very useful.
>> I guess it should be possible to somehow hook up a Marble routing
>> request with the PublicTransport engine [1]. Like having routing
>> profiles for car, bicycle, pedestrian etc., there would be a public
>> transport profile.
>> This would be especially interesting for Marble Touch.
> My feeling is that the public transport engine doesn't help too much. 
> But what about hooking it into an existing routing algorithm? 
> Especially monav should be interesting, because it has a) awesome 
> performance and b) readable code.
> To implement public transport routing in monav, I'd try the following:
> - Make its OSMImporter read public transport ways and nodes (unless it 
> already does). I'm thinking of one train/bus line as a way.
> - Define a speed profile for it: Train like speeds for trains, bus 
> like for buses, etc. Possibly also include pedestrian ways for not 
> directly connected public transport nodes. Speeds for motorcar and 
> bike ways should be 0.
> - Let monav do the rest, should work pretty much unchanged
> - Driving instructions need slightly adjusted wording, but with a 
> train/bus line being represented by a way, should be mostly unchanged. 
> Changing the train is then changing a way, i.e. generates an instruction.
>> Given a user's route request from A to B, possible steps of
>> implementation would be:
>> * just return a very simple route from $nearest_station_to_A to
>> $nearest_station_to_B via $transfer_station (simple straight lines) and
>> output the stations and transfers as "turn by turn" instructions.
>> * if that is working: refine the route by adding coordinates of all
>> stop-overs, getting a more polygon-like route. (If you know the map view
>> at reiseauskunft.bahn.de, you probably get what I mean...)
>> Fetch station coordinates from OSM.
>> * Pedestrian routing from A to $nearest_station_to_A, same for B
>> * Extract actual bus/train driving route from OSM relations?
>> (like ÖPNV-Karte / openbusmap.org)
>> (Long-term dream usecase:
>> I'm in a city at point A and want to get to point B. A quick routing
>> request tells me that I can either:
>> a) wait 12 minutes for the next bus, or
>> b) walk all the way with my average walking speed, taking 10 minutes
>> longer, but without having to stand around and wait, or
>> c) run a short distance to reach another station still in time to catch
>> a delayed tram ;-) )
> Yes, multi-modal routing will be interesting for the future just as 
> calculating the route that needs least energy (e.g. for motorcar 
> routing taking curves, slopes, expected traffic density into account).
>> If there is no one working at such a feature yet, I would like to invest
>> some time into it...
> Sure, much appreciated!
> Regards,
> Dennis
>> Cheers
>> Florian
>> [1] https://projects.kde.org/projects/playground/base/publictransport
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