[Tagging] What is a terrace after all?

Joseph Eisenberg joseph.eisenberg at gmail.com
Mon Sep 10 02:31:31 UTC 2018

André, "terraced housing" is a British English language term for what we
would call row houses in America.
If there is already a building outline for the whole row, and you would
like to make it more precise by outlining each individual house, great!
(As the wiki says, this is the preferred option:
*"A more detailed and recommended alternative is to map each dwelling
separately using building
<https://wiki.openstreetmap.org/wiki/Tag:building%3Dhouse>." )*

You can use the "terracer" plugin within JOSM:
*"Select the terrace outline way and use the Terrace tool (Shift-T by
default) (optionally also select the street to auto-complete the road name
- see below). It will ask for the range of house numbers and the
interpolation between them as well as, optionally, the road name."*
*"...After clicking OK, you are left with the houses selected so that
entering additional shared tags is easier."*


On Mon, Sep 10, 2018 at 9:28 AM André Pirard <A.Pirard.Papou at gmail.com>

> Hi,
> According to my OSM readings, I thought that a terrace was something very
> special, but, according to dictionary.com
> <https://www.dictionary.com/browse/terrace>, a terrace is most exactly
> like French, mainly a) raised ground, b) flat top of a building c) an
> accessible area connected to a building at ground or upper level, such as
> for living or other purposes..
> But beside that, dictionary.com defines a Terrace as a plain row of
> houses without a terrace at all and so does building=terrace
> <https://wiki.openstreetmap.org/wiki/Tag:building%3Dterrace>, unlike
> French and Wikipedia which calls it Terraced_house
> <https://en.wikipedia.org/wiki/Terraced_house> (adjective).
> Practically, I'm correcting hundredths of houses tagged at 3-5m+ away from
> their true location, with incorrect shape and without any addr:* at all.
> And during this I met areas tagged building=terrace that, of course, are
> just as imprecise: they get across the houses.
> If I map the houses that are inside, I get a very logical JOSM
> congratulation: "building inside a building".
> In my mind, building=terrace is a bad tag. It should be:
> building=house
> house:terraced=yes
> be it as a row of houses or a single one.
> But I'm sure a reply will be "we" are not doing like that.  Like what,
> then.
> What should I do? building=terrace
> <https://wiki.openstreetmap.org/wiki/Tag:building%3Dterrace> describes
> mapping separate houses as an *alternative*.
> Erase what another mapper did, and replace that element with houses?
> While waiting, I converted them to landuse=terraced (invisible).
> On the other hand, I once asked how to map a part of the street that is
> fitted with tables and seats near a café or restaurant.
> That is a *real* terrace.
> No answer.
> All the best,
> André.
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