New Quest: What is the via_ferrata_scale on this path?

[mcliquid]

General

Affected tag(s) to be modified/added: via_ferrata_scale
Question asked: What is the via ferrata scale on this path?

Checklist

Checklist for quest suggestions (see guidelines):

• 🚧 To be added tag is established and has a useful purpose
• 🤔 Any answer the user can give should have an equivalent tagging (SCEE quests may not be answerable in all cases, but please keep this rare)
• 🐿️ A survey is necessary (may require knowledge of the subject, though easy answering for everyone is preferred)
• 💤 Not an overwhelming percentage of quests have the same answer (No spam)
• 🕓 Applies to a reasonable number of map data (Worth the effort)

Ideas for implementation

Element selection:

ways with (
highway = via_ferrata
and !via_ferrata_scale
)

Proposed UI:
Option 1:
Image based quest (like smoothness) with reference images

Option 2:
Make it simple and just show a selection of 0 to 6

Verifiability and Subjectivity

It's a very controversial Tag, but I would leave it to the experts to activate this quest.

[Helium314]

I'm not sure whether the quest is worth implementing, there seem to be only a few hundred applicable elements.
(interestingly via_ferrata_scale has more uses than highway=via_ferrata)
But as the work isn't done by me it's still acceptable for SCEE.

I think the smoothness style with descriptions would be useful, as even experienced people with might not remember all the details. Showing the French & German scales could also be useful.

Further there should be a clear warning in the quest disabled message about requiring experience.

[mcliquid]

Could also work for mtb:scale

[Helium314]

For the MTB scale I think that it should rather be an overlay, see streetcomplete#1850 (comment)