[OSM-talk] relations in order not to fragment roads (was: correctly mapping avenues)
Frederik Ramm
frederik at remote.org
Mon Feb 11 20:49:10 GMT 2008
Hi,
> If we add a thing like segment relations as is proposed, we'll
> effectively end up with another level next to points, segments and
> relations (since things like route relations will again have these
> segment relations contained in them), which will likely increase
> complexity a lot in my eyes.
Has anyone actually proposed such a thing? That would indeed be
unnecessarily complex.
As far as I understand it, the idea is simply to qualify a tag with
start and end node. I.e. you have a way that goes from node A, B, C to
Z, but from B to D and from M to P it is a pedestrian road. So,
old scheme:
split way into 5 parts (3 non-pedestrian, 2 pedestrian) and tag
accordingly.
scheme with "superway" relation:
split way into 5 parts and create one relation to contain them all;
add all common tags to relation; add pedestrian tag to 2 ways.
scheme with "qualified tag" relations:
do not split way. create two relations that each contain the way, plus
the start and end node (B/D for relation 1 and M/P for relation 2),
plus the special tag (pedestrian).
Bye
Frederik
--
Frederik Ramm ## eMail frederik at remote.org ## N49°00.09' E008°23.33'
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