[OSM-talk] Crossings of a road

[Christoph Böhme]

andrzej zaborowski <balrogg at gmail.com> schrieb:
> 2009/6/12 Christoph Böhme <christoph at b3e.net>:
> > Shaun McDonald <shaun at shaunmcdonald.me.uk> schrieb:
> >> You could place a footway parallel to the road and map in higher
> >> than normal.
> >
> > I often map the pavement/sidewalk separately from the main road when
> > there they are separated from it by a stripe of grass, trees or
> > hedges. However, while this allows for a quite detailed mapping of
> > footpaths, it does not look very nice on the map as you end up with
> > many dashed red lines parallel to each road:
> >
> > http://www.openstreetmap.org/?lat=52.4265&lon=-1.94337&zoom=16&layers=B000FTF
> 
> I think this looks fine and is also faithful to the reality, even if
> the pavement is not physically separate from the road, logically it is
> a different route.

Hmm, I do not really like the looks of it, but that's prorably in the
eye of the beholder. I think there is no point in arguing about it.

> > I am thinking of tagging these footways as highway=pavement/sidewalk
> > (whatever is not ambiguous) so that renderers can distinguish them
> > from normal footways which are not part of a bigger road. This
> > would allow to only show them in very high zoom levels and also to
> > display them in less catching colours.
> 
> This loses the information of which side the sidewalk is and that may
> be important for routing.

No, I do not want to change anything else apart from setting the
highway-tag to "sidewalk" instead of "footway". They are still separate
ways like I have drawn them. I only thought of tagging them differently
from footways to indicate that the are logically linked with a nearby
road. 

However, writing "logically linked" just rings the relation-bell
in my head and it seems that there are already relations for this kind
of problem :-)

	Cheers,
	Christoph