Hi, On 04/25/2015 12:33 PM, Serge Wroclawski wrote: >> To improve that I would like to encourage mappers to give separately mapped >> footways their proper name instead of leaving them without name.
> Why do that instead of just adding a single tag to the road? Roland's use case is routing for pedestrians. If a road has a tag indicating "this road has a sidewalk" but the sidewalk is not mapped separately, then the router will lead the pedestrian onto the road which is ok. If however the sidewalk is - for whatever reason - mapped as a separate highway=footway, then today it will often be un-named, which leads to the routing engine generating instructions like "follow un-named footway for 2 miles" when instead it should be "follow (footway along) Main Street for 2 miles". Roland's point is that it is too complicated for a routing engine to guess that one un-named footway is really part of "Main Street" and should be announced as such, whereas another un-named footway might really be nameless. His initial suggestion was to simply add the street name to every separately mapped sidewalk. This was criticised because it would likely lead to labeling chaos on the rendering side (with renderers then having to drop footway labeling altogether or implement complex rules like "don't label this if there's a roughly parallel street of the same name" or so). Roland then amended his suggestion to say that if a sidewalk receives (a copy of) the name of the street then it should also be tagged footway=sidewalk so that renderers could choose to omit only the names of these (and not all footways). Personally I am still doubtful whether the sidewalk next to "X Street" really has the name "X Street" but at least the addition of footway=sidewalk would let users decide how to handle it. For example, a geocoder would likely want to omit indexing footway=sidewalk for forward geocoding. Bye Frederik -- Frederik Ramm ## eMail [email protected] ## N49°00'09" E008°23'33" _______________________________________________ talk mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk
