[Tagging] Splitting places and hosted devices in mapping

Johnparis okosm at johnfreed.com
Fri Jun 7 17:48:55 UTC 2019

I believe the key phrase is "single-use" in the sentence you cite. That is,
for instance, if you have a building that is a café (tagged as
building=yes) with a node inside it with the details of the café
(name=Rick's Cafe; amenity=cafe), then you should move the tags from the
node to the area and eliminate the node.

I don't think this applies to the case you are looking at. Even if the
building itself might be thought of as "single use", the devices inside
them per se make it "multiple-use" as it is understood on the "One feature,
one element" page. And as with a multiple use building, you should use
"point or area objects representing the locations of what is in them". So I
don't see a conflict there. Just my opinion.


On Fri, Jun 7, 2019 at 7:09 PM François Lacombe <fl.infosreseaux at gmail.com>

> Hi all,
> The recent work and talks on a proposal I wrote regarding traction
> substations show a need to distinguish sites and devices in our tagging.
> According to
> https://wiki.openstreetmap.org/wiki/One_feature,_one_OSM_element, I think
> it's a important point, especially when you have complex arrangement of
> indoor features in a single building for instance (malls, technical
> facilities, big buildings...)
> The proposal deals with converters (devices) and places/sites (building)
> hosting them, very technical thing in this particular situation. Some
> contributors asked to map one single feature for building and hosted
> devices as an area. To me it would be more valuable to draw the building
> and add nodes inside the perimeter to map the devices (even if there is one
> single main device inside the building)
> Proposal :
> https://wiki.openstreetmap.org/wiki/Proposed_features/Traction_substations_extension
> (See Converters hidden in building chapter on corresponding talk page)
> This would also be the situation for any furniture in a shop or in a
> library, any amenity in a given public place...
> I want to discuss about the sentence here :
> https://wiki.openstreetmap.org/wiki/One_feature,_one_OSM_element
> "An area object representing a single-use building with a point object
> inside it. If you find this, move the tags to the area object and delete
> the point." described as a bad situation.
> I find this inconsistent with the purpose of the page principle, not to
> mention it doesn't reflect to what is seen in the situation of a given
> apparatus installed inside a building (and not built in place as a building
> we need to map both situations separately).
> It also makes hard to follow a proper life cycle for both hosted and
> hosting feature when they are mixed, not to mention headaches to get to
> which feature a particular tag refers.
> I didn't remember of a similar discussion here, and I'll be pleased to
> read your opinions about this topic.
> This would surely make my proposal better and may allow to complete the 1
> feature=1 osm element page.
> All the best
> François
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