[OSM-talk-be] National Road relation: does order matter?

[Nathan Monfils]

After looking into it further, I can only agree. I added the missing members 
back (one way and a few junctions that were probably overlooked by previous 
mappers), but every roundabout and double road "cuts off" the automatic 
ordering by JOSM.
It seems to consider that a loop breaks the relation order entirely and 
doesn't attempt to follow it any further.

I still pushed the changes since they contain a few added members, but I think 
the N30 (and other N roads) will have to stay unsorted, unless JOSM's sorting 
mechanism starts taking geographical proximity into account instead of 
strictly checking the end nodes.

Regards,

Nathan Monfils


On Monday, September 3, 2018 8:09:28 PM CEST Jo wrote:
> The "problem" with N roads is that they are not linear features, they
> split, recombine, have dangling dead ends, roundabouts and so on.
> 
> Yes, you can group some of the elements, but the next time you sort, other
> groups may be formed, so it's arbitrary.
> 
> Jo
> 
> Op ma 3 sep. 2018 om 20:03 schreef André Pirard <A.Pirard.Papou at gmail.com>:
> > On 2018-09-03 00:24, Jo wrote:
> > 
> > for route=road relations order doesn't matter much. It's impossible to
> > sort them according to any meaningful criterion.
> > 
> > A meaningful criterion to sort a route is so that two adjacent ways of it
> > share one same end node.
> > In other words, that the route is ordered the way you travel it without
> > interruptions.
> > That's what the "sort" buttons of JOSM do.
> > And, beside finding a segment more easily, the schema of the route made by
> > JOSM shows the gaps (missing pieces).
> > And in particular it will show if the road is circular.
> > For example, if you sort the N30, you will see a gap between Boulevard de
> > Fraipont and Avenue de la Libération.
> > And 16 other gaps in total.
> > 
> > Last time I spoke of routes with a Potlatch user, he told me he couldn't
> > sort routes.
> > I don't know about ID and that's quite a time ago.
> > 
> > The N30 should be sorted and corrected.
> > I will let Nathan do it if he's busy with it.
> > 
> > Amitiés,
> > 
> > André.
> > 
> > Polyglot
> > 
> > Op zo 2 sep. 2018 om 22:54 schreef Nathan Monfils <nathanmonfils at gmail.com
> > 
> >> Hello!
> >> 
> >> I was doing some editing on the N30 near Liège, when I noticed that its
> >> relation was completely unordered, with ways near the city center being
> >> next
> >> to ways much further south (see relation `124374`).
> >> 
> >> The wiki defines a relation as an *ordered list*, yet only mentions order
> >> for
> >> bus lines. Is there a need for the road relations to be ordered
> >> correctly?
> >> 
> >> Regards,
> >> 
> >> Nathan Monfils
> > 
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