Die freie Weltkarte nutzen und mitgestalten.
Von Frederik Ramm
und Jochen Topf.
28.05.2009 | Jochen Topf
There are many questions around mapping public transport related things in OSM. Should stops be tagged on the traffic way (like the highway or railway) or next to it (say where the bus stop sign stands)? How can you tie together several platforms of one railway station? What is the relationship between a subway line, the platform where it stops and the subway entrance? How should bus lines or subway lines be tagged and what about different variants of the same line? There are many more questions like this. Upon invitation from Geofabrik some people from the German OpenStreetMap community met in Karlsruhe on May 16th 2009 to discuss these issues and make some progress. Twelve people attended this meeting, including Melchior Moos, the creator of the OSM public transport slippy map at www.öpnvkarte.de and Thomas Reincke from the public transport authority of Aachen. Of course Frederik Ramm and me were also present.
Sebastian Schwarz, a student at the Karlsruhe University of Applied Sciences, is currently doing his diploma thesis with Geofabrik on this topic. He looked into previous discussions in the OSM community as well as how other organisations have been modelling public transport data. In this workshop he presented his findings and his ideas for improvements. The discussion then ranged over many topics and I think we found good solutions for many problems. Of course many compromises needed to be done and the ideas we came up with are not the end of the discussion but just one further step. We had to keep current practice in mind and tried to make things as simple as possible but still allow the complex material to be tagged in a way useful for renderers and other uses of the data.
The main topics were:
Much more detail is available on the following Wiki pages:
Once the information has stabilized somewhat we’ll move those pages to a more “official” location.
Feel free to leave comments on the talk pages. Or discuss on the transit mailing list.
Sebastian has also worked on the OSM Inspector and added five new views that show different aspects of public transport mapping in OSM:
Suggestions on how to improve those views are welcome.