[Tagging] Roles of route members (was: Merging tagging scheme on wiki pages of Hiking, ...)

Volker Schmidt voschix at gmail.com
Mon Aug 19 08:50:05 UTC 2019


On Mon, 19 Aug 2019 at 09:47, Sarah Hoffmann <lonvia at denofr.de> wrote:

Assuming we don't care what happens to really botched relations, all cases
> except one that I listed initially are covered with one single simple
> instruction to the mapper: sort your route.
>

I strongly disagree with this advice, at least as far as cycle routes are
concerned (disclaimer: I have mapped many bicycle route relations)
Even many run-of-the mill "linear" (A-to-B) routes have the problem that
the the precise A-to-B route is different form the B-to-A version of the
"same" route. The reasons are mainly

   - roundabouts
   - one-way cycle paths
   - oneway streets without bicycle:oneway=no (frequent in agglomerations,
   the route A-to-B uses different streets from the B-to-A route)

At the practical level it is impossible to sort these route relations
automatically (in JOSM for example) or manually.
The only clean solution for these cases would be separate A-to-B an B-to-A
route relations for the same linear bicycle route.
Apart from the enormous additional work, this does not solve the case of
branched routes, for example.
And I still do not see the benefit of having sorted cycling (an hiking)
relations. I have planned hundreds of cycling tours, which often run along
cycle routes, and have not yet come across a single case, where I would
have needed a sorted list of the ways in the relation. I use rout planners
that visualize cycling routes, and that's it.

Let me also introduce a further complication in the "sorting" discussion
for hiking and cycling route relations.
Some mappers like the idea to keep signposts in the same route relation as
the ways making up the route. This strategy has been adopted in an
important collaboration between the Italian Alpine Club (CAI) and OSM (in
Italy represented by WIkimedia Italia). Unfortunately the corresponding
wiki page <https://wiki.openstreetmap.org/wiki/CAI> is only available in
Italian.
I have done some minor work in that direction on one or two cycle route
relations, where I was involved in placing the signposts and for that
reason had direct access at the position data.

Volker
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