[OSM-talk] Left and Right?

[Karl Newman]

On Sun, Aug 24, 2008 at 9:53 AM, Rory McCann <rory at technomancy.org> wrote:

> Gervase Markham wrote:
> > What's current tagging best practice with things which are to the left
> > or the right of a way (e.g. bus stops)?
> >
> > A nearly-approved proposal for a canal-side object has been objected to
> > by someone who thinks that the tag should be on a node which is part of
> > the canal rather than next to it, with left/right indicated as part of
> > the tag key name.
> > http://wiki.openstreetmap.org/index.php/Proposed_features/Mooring
> >
> > Do we do that for any other tags? Do we have highway:left=bus_stop?
> >
> > Gerv
>
> Personally I add the node to left of the way, not as part of the way. I
> believe the OSM theory is that the way represents the middle of the
> road. So things like mini-roundabounds and traffic lights are part of
> the way (ie road), but a bus stop is off to the side of the road.
>
> A similar thinking is obvious in the Karlsruhe House Address Scheme
> (
> http://wiki.openstreetmap.org/index.php/Proposed_features/House_numbers/Karlsruhe_Schema
> ),
> since the buildings that are numbered are not physically in the middle
> of the road, they are added as nodes to the left or right of the way.
>
> Rory
>

Yes, and that method is not topological, which makes it very difficult to
associate that feature (bus stop, house number, whatever) with the way that
it's actually located on. It should either be a node that is part of the
way, or have a relation to connect the node with the way.

Karl
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