2017-07-14 12:20 GMT+02:00 Svavar Kjarrval <[email protected]>: > > A street segment with no sidewalks on either side: > http://www.openstreetmap.org/#map=19/64.12876/-21.90466 > >
This is an urban example, but probably you don't have sidewalks in most of the country (rural areas), and it likely isn't a problem for routing engines. > A street with a sidewalk on either side but no marked crossings: > http://www.openstreetmap.org/#map=17/64.08800/-21.89846 > (Sidenote: If one tries to route from no. 73 to 42, > GraphHopper suggests a long route while Mapzen assumes the user is > already on the other side of the street) > > These are (IMHO) mapping errors. You can't draw isolated footway islands and expect a router to magically understand those are sidewalks which you can cross without a connection. E.g this: http://www.openstreetmap.org/way/102907998 There aren't even footway subtags like footway=sidewalk, but even if there were I wouldn't expect working routing from this graph. > A street segment where the paved sidewalk ends prematurely (same as I > described, except they do widen the street in that case): > http://www.openstreetmap.org/?mlat=64.11777&mlon=-21.84680# > map=19/64.11777/-21.84680 > no immediate problem for routing, as they are connected > (Sidenote: I do wonder if it would be alright to put a sidewalk talk on > the road segment at the end of that street) > the properties will always refer to the whole object, so if a part of the road has a sidewalk, another part has not, you have to split the road and add different tags. I wonder how all those tags have come into OSM, and what their meaning is? Has this pile of cryptic, undocumented abbreviations really made it through the import process? http://www.openstreetmap.org/way/92639788 Routers seem to > have a hard time knowing when it's alright to suggest the user "jump" > onto the sidewalk from the road or vice versa if there isn't a footway > such as ones used for crossings. you should assume that routers never "jump" from one way to the other without an explicit connection. Cheers, Martin
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