Martin Chalifoux: > This morning I checked some large cities namely New-York, Paris, Amsterdam, > London, Berlin. Since OSM is best developed in Europe these capitals make > sense. I just checked Tokyo, Shangai, Seoul, Sydney to sample Asia. None of > them have this sidewalk mapping as separate ways. I however found a bit of > that scheme in San-Francisco. I am not sure where this idea is coming from, > who is backing this implementation and who it does service to, but it sure is > a mess in many ways.
I map in both Europe and Canada. More Europe for the time being, because I do not think that I will be using my plane ticket to Canada next week. In North America it is more common, I think, to separate roads and sidewalks by a small patch of grass. Which is an argument for mapping sidewalks individually. I think e.g., a ditch would be a stronger argument. In Europe, or at least Denmark, we have a lot of roads with both sidewalks and bicycle lanes or tracks. Mapping an intersection where several roads have sidewalks and bicycle lanes, becomes very complicated if you map everything individually. For roads with traffic signals it becomes even more complicated. Not to mention that it could be avenues where you map each direction of the motor_vehicle road individually. > And when the people adding that stuff will go away, who will maintain that > complexity, the volunteers ? The use of tags as you suggest would be much > cleaner and easier. The OSM database is used by a large community of > navigation apps that will all have to deal with this one way or another to > still provide meaningful navigation prompts that are not just like “walk on > path, in 100m turn left on path, in 300m turn right on path", perhaps by > filtering out these ways from their apps, I really don’t know. Otherwise > everybody will move to Google Maps which sure won’t bother with that stuff. > Anyhow, have to go back to self-quarantine, I feel a fever :-) > > Happy mapping. > >> On Apr 3, 2020, at 13:15, Niels Elgaard Larsen <elga...@agol.dk> wrote: >> >> Martin Chalifoux via Talk-ca: >>> It is not hard Justin, just inadequate. The app then tell you “turn right >>> on path” >>> rather than “turn right on Main Street”. Close enough. >>> >>> I was assuming pedestrians can figure to use a sidewalk without it being >>> added to a >>> map, but maybe that’s more difficult than I’d assumed. >> >> >> Routing software might prefer roads with sidewalks. >> >> And if there is only sidewalks on one side of the road that might make a >> difference >> for routing. >> >> But that is why we can tag roads with sidewalk=both/left/right >> >> Which I think is most of the time a much better solution. >> >> I have had to change or delete a lot of individual sidewalks in Canada >> because of >> topology problems. But there is still a lot left. >> >> For example: >> https://www.openstreetmap.org/way/138463840 >> and all the other sidewalks next to it. >> >> These sidewalks are not connected to anything. And that is a big problem. >> If you start your walking journey from inside one of these blocks, you will >> not go >> anywhere because the router will know that you are on a way that is not >> connected to >> anything. No route to destination. >> Or you get routes like this: >> https://www.openstreetmap.org/directions?engine=graphhopper_foot&route=42.99484%2C-81.18224%3B42.99590%2C-81.18204#map=18/42.99581/-81.17946 >> >> I have experienced this IRL and it is very frustrating. >> >> Ottawa is better. >> But consider a route like this: >> https://www.openstreetmap.org/directions?engine=graphhopper_foot&route=45.38337%2C-75.64155%3B45.38313%2C-75.64109 >> >> That is not how you would actually visit you neighbor. >> Adding a lot of driveways or paths connecting the sidewalk to the road helps. >> But most real users would not let one meter of grass stop them from crossing >> the road. >> >> -- >> Niels Elgaard Larsen >> >> _______________________________________________ >> Talk-ca mailing list >> Talk-ca@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/talk-ca > > -- Niels Elgaard Larsen _______________________________________________ Talk-ca mailing list Talk-ca@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ca
