[Tagging] Correct use of height with kerb

Alessandro Sarretta alessandro.sarretta at gmail.com
Sun Jan 12 06:15:38 UTC 2020

Hi Volker,

the values raised and lowered for a kerb (node) are related to the 
vertical gap between sidewalk/crossing and not really to the direction. 
Raised means that there is a (more or less) big transition (in the kerb 
page [1] it says >3 cm), while lowered means a smaller transition, and 
flush no gap at all. All of this regardless of the direction (up or down).


[1] https://wiki.openstreetmap.org/wiki/Key:kerb

On 11/01/20 11:08, Volker Schmidt wrote:
> I do have a related question, regarding the kerb values lowered|raised 
> on a node.
> Assume you find yourself on a pedestrian crossing across a road that 
> has an adjacent sidewalk and cycleway on the same side.
> The main carriageway is separated from the (foot-only) sidewalk by a 
> kerb and that is separated from the cycleway by another kerb. The 
> first kerb is typically raised (as the tag refers to a kerb between 
> the road and the sideway, and the latter is always higher than the 
> road), but the second kerb (let's assume that the cycle path is 
> physically higher than the footway) is it kerb=raised (a step upward 
> from the footwalk to the cycleway) or is it kerb=lowered (a step down 
> from the cycleway to the sidewalk)? I have come across a number of 
> these in the same context that Ale mentioned. I fear my conclusion is 
> that  the values "lowered" and "raised" on a node "kerb" need to be 
> accompanied by direction=forward|backward (like stop and give-way, for 
> example) with respect to the "crossing" way. I don't like my 
> conclusion, but it seems inevitable.
> (I hope I'm wrong on this last statement)
> On Sat, 11 Jan 2020 at 06:49, Alessandro Sarretta 
> <alessandro.sarretta at gmail.com <mailto:alessandro.sarretta at gmail.com>> 
> wrote:
>     Dear all,
>     I'm doing some work cleaning the edits we've done around Padova
>     for the local plan for the elimination of architectural barriers
>     (some references here: https://doi.org/10.5281/zenodo.3370704).
>     The height of kerbs, in this context defined as the nodes at the
>     intersection between sidewalks and crossings, is quite an
>     important element for the evaluation of accessibility of sidewalks
>     and crossings. I think the agreed tagging system is:
>     kerb=yes/lowered/raised/flush + kerb:height=<a number><unit>
>     as described here
>     https://wiki.openstreetmap.org/wiki/Key:kerb#kerb:height.3D.3Cheight.3E.3Cunit.3E
>     Around Padova I found some inconsistencies that I'm going to
>     correct, but I see similar ones around the world and I'd like to
>     ask you if you think they should be corrected, when found.
>     Here the questions:
>       * should the tag barrier=kerb be always avoided in these cases
>         and deleted when found? (
>         https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dkerb#Possible_Tagging_Mistakes
>         )
>       * is the tag height=* to be always changed into kerb:height=* ?
>     Thank you,
>     Ale
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