Hi, I have a micromapping question about benches. When I come across the SCEE “What’s this bench made of?” quest I don’t know what to answer. We agree that this is a material=wood bench: example (with cat)
But what about benches like this: example? Should it be mapped as material=wood or material=metal;wood? (I took a look with Overpass and most benches of this kind are mapped as material=wood atm).
Then I looked at the amenity=bench wiki, and I read:
material=* – What is the bench (seating) made from? e.g. wood, steel, stone.
But I don’t really understand it (maybe because of my poor english). It says that surface=* is to be used when the “seating” is different from material=*, but material=* is also to be used for the “seating”, so what’s the difference?
There’s one example with material=concrete+surface=wood, it seems that material=* is to be used for the “base/frame” of the bench and surface=* for the “seating”. But this other example, is just mapped as material=wood, shouldn’t it be surface=wood+material=metal using the same logic?
In the case of benches, I think it’s the seating that matters, unless all the other stuff outweighs it materially.
When does stool stop being stool? When does it have three legs left, two legs, one leg? When does a bench stop being a bench? In the fifth example, it remains one even without the wooden surface. In the second, it will cease to exist without it
With this tagging the fact that part of the bench is made of metal gets lost tho (that’s why I tagged the topic as micromapping).
In any case I think the wiki should be re-wrote to be more clear, if the consensus it that surface+material is to be used only if “other stuff outweighs” the seating material. Personally I would prefere a schema that includes both frame+seating materials, so material=metal;wood or surface+material.
I fully agree with @elkmap, the description in the wiki is quite clear imho. “material” refers to the seating/backrest. Only in the very special case of a bench made of a certain material (like a concrete block) having an additional top layer for more comfort (wood or plastic) the “surface” tag is meant. Such a bench could still be used for seating without the top layer of wood or plastic so it makes sense to add a separate tag for the surface (top layer).
If you want to micromap benches by distinguishing the material used for the frame and the seat and probably also the backrest additional tags would be required, like “material:frame” and “material:seat” and “material:backrest” (I remember having seen a bench with concrete frame and wooden seat where the wooden backrest was rotten and replaced by plastic planks). I dunno if such detailed tagging makes sense but it would represent what is present on the ground.
I don’t think so. The wiki sample given for the use of surface=* is very clear and self-explanatory. Also the wiki description for material=* being used for the seating/backrest cannot be misunderstood. Using “material” for the frame and “surface” for the seating as practised by @goedegazelle does not correspondent to the wiki.
If micromapping of benches by distinguishing between frame and seating is wanted a proper tagging should be established instead of misusing the existing tags imho. The proposal of @Fizzie41 sounds good to me. Probably some other wiki experts could comment …
Benches: material (the body of the bench) which is seat and backrest with 1.2 million uses so far and 24K of them having been tagged with material=*. Changing the meaning of what material is understood to be is not a great idea IMO. If one insists on having the make of the legs/frame recorded to which the seat and backrest are fixed call it benchframe or benchsupport, unmistakable. Yesterday saw a double sided bench in stone or polished concrete, with legs of same, which reminded me of the Chieti city park having a dozen, one piece. Needs some pondering how to tag that.