[Tagging] Node objects in tunnels or on bridges?

Dave Swarthout daveswarthout at gmail.com
Mon Jun 8 15:51:20 UTC 2015

Take a look at this example, the Galata Bridge in Istanbul, Turkey


The tunnels under the streets are lined with shops on both sides of a wide
walkway. It's essentially a mall and all of it is underground. I added a
few shops and added the layer=-1 tag to them but I am not sure how such
shops should be rendered. GraphHopper can find them if you ask for a
walking route to one of them but stumbles on the same route for a car. It
leaves you on the roadway on top of the bridge nearest the shop, which is
at least realistic if not practical.

On Mon, Jun 8, 2015 at 4:45 AM, Ilpo Järvinen <ilpo.jarvinen at helsinki.fi>

> On Mon, 8 Jun 2015, Richard wrote:
> > On Mon, Jun 08, 2015 at 01:57:52PM +0200, Dominik George wrote:
> >
> > > In that case, I believe the layer=* tag should be used instead, giving
> > > the object the same layer as the tunnel or bridge.
> >
> > not such a good solution.
> >
> > For real-world-node-objects where the node is part of the tunnel/bridge
> > way I think it can be expected that his node implicitly shares the tunnel
> > +layer values.
> >
> > That leaves the problem with objects where the node is *not* part of the
> > tunnel/bridge way such as a waste basket next to the way.
> > Seems like in this case a relation is needed ?
> Drawing bridge outlines (effectively drawing bridges as areas) would help
> you to make the connection without relations. Then only complex cases
> would need to depend on relation.
> --
>  i.
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Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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