[Tagging] How to map terrace buildings with names

Skyler Hawthorne osm at dead10ck.com
Wed Jul 8 02:59:02 UTC 2020

This is a very interesting example; thanks for sharing it! It definitely 
helps me see where you're coming from, and how this practice came into 
common use.

Although it is a very ambiguous situation, I would still side on this being 
a single building that just so happens to have grown slowly over time. 
Although I would not disagree that they are separate buildings either.

However, your example seems like a case that is particularly ambiguous. I'm 
not sure if it's totally comparable to the case I mentioned, which seems 
more clear cut to me. It's a single building purpose built to contain 8 
homes, all by the same builder, all in the same style. Additionally, these 
homes are part of a homeowner's association, which means there are 
restrictions even on what the owners can do to the exterior without 
approval from the association, and large structural changes to the 
buildings are not likely in the foreseeable future.

What I'm thinking is that it might be useful to have a concise discussion 
of this ambiguity in the wiki page. Since it seems to be up to 
interpretation, though, it seems providing different ways of representing 
the varying levels of ambiguity in the real world would be useful.


On July 7, 2020 18:06:26 Paul Allen <pla16021 at gmail.com> wrote:
> On Tue, 7 Jul 2020 at 22:41, Skyler Hawthorne <osm at dead10ck.com> wrote:
> My own personal interpretation would be to say that if two houses share
> a wall, they are part of the same building. Buildings are expanded all
> the time. If a shopping mall expands a wing to give more space for more
> shops, we do not say the new section is a separate building; we say the
> building has gotten larger.
> Copyright prevents us using Google Streetview for mapping, but we
> can use it for illustrative purposes.  https://goo.gl/maps/o6ribodaAqUhvak2A
> That group of five dwellings was originally called Priory Terrace (the name
> is not part of the address and few people know it used to be called that).
> They were built at the same time by the same builder and are listed
> by a heritage organization as being of significant value.
> Talk a walk to the north-east (left in the image) and you will see a long line
> of conjoined buildings of different styles.  Most (all?) of those other 
> buildings
> were built after the first 5, yet it would be perverse to describe
> them as extending or enlarging those original 5 dwellings.  They're
> houses that happen to share side walls (because it's cheaper and
> lets them take up less room).
> I said this earlier in the thread, but I think it is still applicable:
> when we're tagging shopping centers, where there is a large building
> containing several shops, we tag the large structure as
> building=retail, and the shops as amenity=*; we do not map them as
> building=shop or something like that, because they are not separate
> buildings. Why do this for houses/dwellings?
> Because if you followed that Streetview walk, you'd have countered 33
> dwellings in that terrace.  It's nice to be able to give them addresses.
> Because they're of different sizes, it's nice to show where the boundaries
> between them are.  This is the start of that walk:
> https://www.openstreetmap.org/?mlat=52.08572&mlon=-4.65826#map=19/52.08572/-4.65826
> Your personal justificatons for your mapping choices are perfectly
> fine, but that's not what I'm proposing changing. Since it is not well-
> defined what to do when a terrace has a name, that is why I am
> proposing the tagging scheme with a different usage of building=terrace
> than what you and the wiki say,
> My opinion counts for no more than anybody else's, so you are free to
> disregard it.  Redefining established use of a tag is problematic.  To say
> the least.
> --
> Paul
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