Am 13.02.2011 20:57, schrieb j...@jfeldredge.com:
I guess this partly comes down to the questions of how you define a way, and
how you define a pass. If a particular pass becomes little-used, because a
tunnel or a lower pass provides an easier way to get past the mountains, does
that make it stop being a pass? What if the pass is a boundary between two
nations, and the border crossing is closed because one or both nations don't
maintain a customs station there? Does that make the pass stop being a pass,
in the geographic, rather than political, sense?
-------Original Email-------
Subject :Re: [Tagging] Mountain passes
From :mailto:dieterdre...@gmail.com
Date :Sun Feb 13 13:36:08 America/Chicago 2011
2011/2/13 Nathan Edgars II<nerou...@gmail.com>:
According to http://wiki.openstreetmap.org/wiki/Key:mountain_pass "passes
only make sense on ways". But it's possible to have a pass with no way
crossing it (not even an informal footpath) or with multiple ways crossing
(a dual carriageway, or parallel highway and railway). How should these
cases be handled?
no, it is IMHO not possible that a pass has no way that crosses it,
otherwise it wouldn't be a pass.
In the narrower sense you are correct, but:
http://en.wikipedia.org/wiki/Col_de_Bretolet
A pass (french: Col) that has no way to either side, but a way over a
ridge from the Col de Cou ;-)
If there is more then 1 one way I
guess you would have to tag all of them.
Especially in the U.S., I've seen some dual carriageways with two pass
nodes, e.g.:
http://osm.org/go/T2U0CV8Ye-?layers=O
Maybe natural=pass (or mountain_pass) on a node might be more logical
for the feature if you bear in mind that the wiki suggests to tag ele
with it.
The underlying problem "what makes a pass a pass" is *very* difficult to
answer, e.g. there's a lengthy Wikipedia discussion about it. If a pass
is closed due to political differences but there's a way over it, this
is an easy one (mountain_pass=yes and access=no).
The difficult question: What is generally a way in this regard? If you
can travel the pass by car, 4*4, horse, MTB, hiking, via ferrata or
extreme sports?
If you read the wiki page, it started in 2007 with highway=pass, so you
can see that I (and others) basically had roads in mind when I've wrote
it (and no one at that time seemed to even mention passes with no way).
In practice today, a lot of nodes with mountain_pass=yes are tagged,
where you don't see any way nearby (maybe from imports?), and a lot of
nodes on hiking trails, roads, etc.
So today in OSM a mountain_pass=yes denotes the geographical feature in
the wider sense (german: Scharte, Sattel, Joch, ...), not the "narrow
definition" of being a passage on a way.
Regards, ULFL
P.S: What bugs me more is the (not so un)common practice to put the node
near the way (where the sign is?) and not exactly on the road. This
makes it difficult for renderers to detect the kind of way a pass
"provides" ...
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