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<div class="moz-cite-prefix">On 27/09/19 03:14, Martin Koppenhoefer
wrote:<br>
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<div dir="ltr" class="gmail_attr">Am Do., 26. Sept. 2019 um
19:03 Uhr schrieb Markus <<a
href="mailto:selfishseahorse@gmail.com"
moz-do-not-send="true">selfishseahorse@gmail.com</a>>:<br>
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<div dir="auto">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?</div>
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<div>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). </div>
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Technically the usual stair/step basic specifications are;<br>
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'rise' vertical displacement from one step to the next step<br>
'going' or 'run' horizontal displacement from one step to the next
step<br>
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See<br>
<a class="moz-txt-link-freetext" href="https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/8393/2077370.pdf">https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/8393/2077370.pdf</a><br>
<a class="moz-txt-link-freetext" href="https://en.wikipedia.org/wiki/Stairs#Measurements">https://en.wikipedia.org/wiki/Stairs#Measurements</a><br>
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Note: number of steps is the number of risers, not treads. <br>
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<div>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.</div>
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<div>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).</div>
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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. <br>
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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. <br>
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<div>And of course there are many more, like surface, general
geometry (linear / circular / ...)<br>
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The geometry would be given by the map. <br>
OSM already has a surface tag. <br>
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