On 17 Dec 2008, at 18:29, Ævar Arnfjörð Bjarmason wrote: > On Wed, Dec 17, 2008 at 4:47 PM, Adam Schreiber <sa...@clemson.edu> > wrote: >>> I wound be very interested to see the first time that a transport >>> authority took a person to court for promoting their services but >>> there may be a first time! I do suggest that this is a different >>> project from OSM though. >> >> Yes, but certainly tied to OSM data though. It would be very cool if >> from this other project, people could assemble routes from nodes >> already tagged as bus/train stops, add time table info for routes >> already in the OSM DB and set nodes as the appropriate stops. This >> would probably need some form of a heavily modified potlache. > > I don't see why this needs to be a separate project. We already have > Key:opening_hours for amenities, why not Tag:highway:bus_stop with > additional tags that describe when each bus line stops there and a > relation to map the greater bus route. That should be sufficient > information to map the transit system and the data wouldn't be spread > across two independently maintained databases.
I assure you public transport timetables are very complex and one most certainly can't implement it as tags to the OSM model. Consider the bus service that runs on market days and wednesdays during school holidays and stops at some places at a fixed time (a timing point), stops at other stops when it gets there (non-timing points), can be flagged down on some parts of the route (hail and ride) and will wait up to 5 mins for a delayed train at xxx station (connection protection). GTFS is the simplest timetable format and even that one falls down in complex situations. The complexities go on an on! Anyway, if one uses GTFS I believe one gets a trip planner for free with Graphserver. This is as simple as it gets and would be a sensible starting point. The stops would however be referenced to OSM as would the shapes: http://code.google.com/transit/spec/transit_feed_specification.html Given that timetables change a lot more frequently than roads and bus stops it is actually good practice to separate them. I am going to ask for a new list. No one else has voted for it but there is a good conversation going on and I think it needs a home. Regards, Peter _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
