I am asking this for clarification due to multiple changets by the same user like Changeset: 189623944 | OpenStreetMap , where existing natural=saddle points in the middle of two lane roads was duplicated and moved on both lanes, as well as additionally tagged with “mountain_pass=yes”.
This image demonstrates the original saddle point (in blue) and how it was moved to the upper lane, as well as the added point (in green) on the lower lane.
Of course, both locations are mountain passes.
However, a saddle point - the lowest point between two ridges - is mapped as a single node. And while theoretically a whole are could be the lowest part at the same height, as far as I have understood, we map and rather use the definition of a single point.
What do you think?
Reading the wiki page for saddle points, I tend to agree with you. Duplicate saddle points violate the “One feature, one element” rule: One feature, one OSM element - OpenStreetMap Wiki
As far as I know - but I am not sure - you can tag mountain_pass=yes on node without natural=saddle
So you would have one natural=saddle and as many mountain_pass=yes as there are carriageways crossing this saddle?
In some cases you would have natural=saddle and mountain_pass=yes on one point, but not all.
can you comment on their changeset and link this thread? It is in a good tone to let mapper know that their edit is analyzed, except cases where they are troll/spammer/vandal and nothing indicates this applying.
this edit is discussed at https://community.openstreetmap.org/t/should-saddle-point-natural-saddle-be-a-unique-point/148203 would be enough as minimal info though something friendler would also work
Of course, I know.
I did discuss a few other related changes directly by them in the changesets, but this time didn’t want to bother them again until I am sure this is a possible error, since I’m not exactly familiar with tagging of saddle points.
I invited them to the discussion now.
Hi, thanks for the opinions.
Yes, you can have that, it is indeed exactly described in the wiki, that a mountain pass does not always go through the saddle point.
Yes, that’s why they have a project of moving all saddle points that lie close to a road into the road nodes.
The point here is that, in this case of a two-lane road however, this duplicates the saddle point.
That might be the most sensible way to fix this. Have the saddle point stay singular, and tag both sides of the road with mountain_pass.
