[Tagging] Feature Proposal - RFC - footway=indoor

[Warin]

On 27/09/19 03:14, Martin Koppenhoefer wrote:
>
>
> Am Do., 26. Sept. 2019 um 19:03 Uhr schrieb Markus 
> <selfishseahorse at gmail.com <mailto:selfishseahorse at gmail.com>>:
>
>     BTW, i find it very strange that there is a separte highway=* tag
>     for indoor "flat ways" (i.e. corridors), but not for steps. Any
>     reasons for that?
>
>
>
> Not sure if we need a different tag (in both cases), but for steps 
> we're missing some basic parameters to define them. There is 
> "step_count" which is fine, but it lacks the steps measurements (e.g. 
> 18/27, which means 18cm high and 27 cm "free" to stand on (this is the 
> outer measurement and does not account for the part of the step that 
> is covered by the next step, if any, depending on the construction 
> details).

Technically the usual stair/step basic specifications are;

'rise' vertical displacement from one step to the next step
'going' or 'run' horizontal displacement from one step to the next step

See
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/8393/2077370.pdf
https://en.wikipedia.org/wiki/Stairs#Measurements

Note: number of steps is the number of risers, not treads.

> And the width of the thing (usually net width = width - handrails and 
> other stuff that obstructs the steps). The height can also easily be 
> calculated from the height difference and the step count.
>
> Additional interesting properties could be: necessary steps (required 
> by building code) or not, steps suitable for use during fire / with 
> forced smoke outlets, etc. (important emergency information).

Stairs for use in a fire are usually fully enclosed behind doors that 
latch closed and the doors are fire rated, the enclosure is also rated 
for fire.

Building codes will change from place to place. As building codes will 
cover some area and change from time to time I don't think they need to 
go into OSM.


>
> And of course there are many more, like surface, general geometry 
> (linear / circular / ...)

The geometry would be given by the map.
OSM already has a surface tag.
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