[Tagging] How to put a name tag on an area with more than one type?

[Joseph Eisenberg]

Currently the features with the tag "name=Kebnekaise" are 2 ways which
extend north-south and to the west from these two peaks and are also tagged
natural=arete (an arete is a knife-edged ridge formed between 2 glaciers).

https://www.openstreetmap.org/way/123215393#map=13/67.8934/18.4509&layers=C
https://www.openstreetmap.org/way/407174801#map=14/67.8999/18.5215&layers=C

Is this correct based on your local knowledge of the area?

If in fact Kebnekaise is the name of the ridges or aretes, then this is a
good way to represent the name of the "mountain" which in this case appears
to be a thin ridge between glaciers.

Note that Opentopomap handles this fairly well:
https://www.opentopomap.org/#map=14/67.90026/18.50553 and
https://www.opentopomap.org/#map=13/67.90113/18.46716

I believe OpenTopoMap also renders natural=mountain_range ways:
https://www.opentopomap.org/#map=12/38.4613/-4.1566

OpenTopoMap uses a special script to assign an isolation value to each
peak: that is, how far is it away from another natural=peak (or
natural=volcano) with a larger elevation value? If it is a long way, the
peak will be rendered even at low zoom levels (large scales), for example:
https://www.opentopomap.org/#map=7/67.900/18.479

This hasn't been implemented in the OpenStreetMap-Carto style because it is
somewhat complicated and might have performance problems and there are
issues with using more pre-processing of the raw data when it comes to
mapper feedback, but the code used by OpenTopoMap is here:
https://github.com/der-stefan/OpenTopoMap/pull/129 and
https://github.com/der-stefan/OpenTopoMap/pull/130  if anyone else wants to
implement this for their own maps.

-- Joseph

On Sun, Dec 13, 2020 at 12:14 PM Mateusz Konieczny via Tagging <
tagging at openstreetmap.org> wrote:

>
>
>
> Dec 13, 2020, 19:58 by anders at torger.se:
>
> Do you have a suggestion of how to map Sweden's highest mountain,
> Kebnekaise?
>
> The mountain is called Kebnekaise, it has two peaks, one is called
> "Sydtoppen" ("the south peak"), the other "Nordtoppen" ("the north peak").
>
> I admit that I have no good idea, if I would run into such case and failed
> to find a better idea
> (hopefully one will come) I would invent a new way to tag that.
>
> natural=mountain? Main problem is where to put it - node at arbitrary
> position between peaks?
> Node at location of highest peak? Area? Relation? All of that is sadly
> problematic.
>
> (The mountain_range tag is a great tag, but I note that its status is just
> "in use", it's not an approved tag :-O.)
>
> It is perfectly fine to use tags that never went through tagging proposal,
> though
> I am not going to endorse this one. Tagging mountain ranges seems to
> poorly fit OSM
> with multiple different opinions where mountain range starts/ends and
> inability to
> verify it by survey.
>
> All tags were in some stage rarely used before becoming heavily used,
> only some cases went through a proposal process.
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