[Tagging] Grouping buildings together using relations
steveaOSM at softworkers.com
Sun Jan 10 09:55:33 UTC 2021
On Jan 10, 2021, at 1:45 AM, Volker Schmidt <voschix at gmail.com> wrote:
> The multipolygon solution is OK as long as you do not have to include node-type objects.
AFAIK, node objects are just fine in multipolygons. They are uncommon, but they are OK. There is no "prohibition" against them.
> "My" university example includes nodes, typically smaller University institutes that occupy only part of a building, hence are tagged as nodes within the building or on the outline of the building they are in.
Works for me.
> Another remark: You say " I believe this is a mis-use of the concept of relations in OpenStreetMap, since it is not representing a distinct feature that can be observed to exist locally, on the ground."
> Where does this come from? What about e.g. boundary relations?
Volker asks an excellent question here. I also await Joseph's answer here.
> Also this one: " mapping widely disparate faculties in different neighborhoods as one database object is not something that can be verified practically by mappers. "
Volker make an excellent observation here. (I think Joseph means "facilities" instead of "faculties," I might be mistaken). Widely disparate facilities in different neighborhoods is indeed something that happens with (especially very large) universities (the "campus" is spread out over multiple sites in a larger city, for example). It most certainly CAN be verified practically by mappers. It might take a while to visit all of the disparate sites, but it most certainly can be done. If widely disparate collections of buildings on multiple (but relatively close-by) sites make up a single university, they should all be in the same relation. Whether buildings as ways or nodes that are sensibly tagged. I've never used a "site relation," but that seems like a dead-on bullseye example ideally suited to the concept.
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