generate GTFS pathways data from OSM, transit datasets, etc.

[derhuerst]

Using the GTFS pathways extension, one can specify ways to get into stations, from one platform to another, etc. This will hopefully help a lot with accessibility & routing time computations. See google/transit#108 for details.

Let's generate this data from OSM, which has some elevators, entrances and pathways through stations mapped, as well as other official and non-official transit data sources!

This Issue is intended to be a tracking issue, linking to other Issues or projects working on this.

[derhuerst]

@opyh knows a lot about this topic and is motivated to work in this area.

[lenaschimmel]

This sounds related to https://github.com/ad-freiburg/pfaedle (Came across this issue again and realized that pfaedle is not actually related)

[lenaschimmel]

In the Open Transport Meetup opener was mentioned, and this time it seems to be actually related, though with a focus on accessibility.