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Difference Between Concrete, Concrete Slabs and Concrete Lanes? (lemm.ee)

submitted 4 weeks ago by pineapplelover@lemm.ee to c/openstreetmap@lemmy.ml

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I'm on Street Complete and I'm trying to differentiate between Concrete, Concrete slabs, and concrete lanes. There's a walkway that's just a normal concrete walkway, I didn't know there were so many designations for this.

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[–] triplenadir@lemmygrad.ml 2 points 4 weeks ago (9 children)

There might be something on the wiki, in the meantime how I decide is:

if it's a single expanse of poured concrete it's Concrete
if there is dirt / grass between two parallel tracks of concrete (whether or not the tracks have any joins) it's Concrete Lanes
if it's just concrete but there are seams where it's been poured separately, Concrete Slabs

And if it's anything else I skip.

[–] Tyoda@lemm.ee 4 points 4 weeks ago* (last edited 4 weeks ago) (7 children)

You're only supposed to use slabs (plates) if they were pre-made. If it was poured (whether in one batch or multiple), the wiki says it should be just "concrete".

https://wiki.openstreetmap.org/wiki/Key:surface :

concrete: Portland cement concrete, forming a large surface, typically cast in place and may have predetermined breaking joints. For pre-fabricated plates, please use concrete:plates or concrete:lanes if you know how the concrete is laid out and one of these tags fits.

edit: Tbh most people probably don't realize this, I probably mistagged some myself. I assume even advanced software would treat "concrete" and "concrete:plates" equally, perhaps giving some special treatment for "concrete:lanes".

[–] pineapplelover@lemm.ee 1 points 4 weeks ago (6 children)

Unless I see them being constructed, how would I know?

[–] InsertUser@en.osm.town 2 points 4 weeks ago (1 children)

@pineapplelover @Tyoda @openstreetmap

The ones on the wiki have visible lifting points.

They might also have visible alignment issues or evidence of moulding at the seam or corners.

[–] pineapplelover@lemm.ee 1 points 4 weeks ago (1 children)

So a concrete sidewalk would mean the entire sidewalk was poured in one piece? No moulding or anything?

[–] InsertUser@en.osm.town 1 points 4 weeks ago (1 children)

@pineapplelover @openstreetmap
They would usually be poured in one or two slabs with the joints added to the wet concrete or cut later.

If it looks like an impossible mould would me needed it's more likely to be pre-fab and lifted into place later.

[–] pineapplelover@lemm.ee 1 points 3 weeks ago (1 children)

This thread says concrete means the entire thing was poured in one piece, no lines

https://help.openstreetmap.org/questions/85524/concrete-vs-concreteplates

[–] InsertUser@en.osm.town 1 points 3 weeks ago (1 children)

@pineapplelover @openstreetmap
That thread has a top answer with a grand total of one vote on it, I wouldn't take it as consensus on anything.

Concrete that is poured in one piece usually has visible lines. They're placed there after the fact or when the concrete is wet to control how it cracks as it settles. That doesn't mean it's separate plates. The cuts normally aren't full depth.

[–] pineapplelover@lemm.ee 2 points 3 weeks ago

The wiki seems to have good information also

https://wiki.openstreetmap.org/wiki/Key:surface

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