[Tagging] What is a terrace after all?

Warin 61sundowner at gmail.com
Mon Sep 10 01:18:15 UTC 2018

On 10/09/18 10:27, André Pirard wrote:
> 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).
While a 'terrace' is that .. a 'terrace building' is not that.

 From https://en.wikipedia.org/wiki/Terraced_house

"a row of identical or mirror-image houses share side walls."

The modern practice is to build 'town houses' to try and achieve a 
similar population density.

> 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).

landuse=residential is the correct tag .. for the area .. not the building!
It should be used to cover the general residential area.

You may as well have used pirade=something_to_do_later
that would at least have other mappers not try to interpret the 
landuse=terraced into something such as landuse=agriculture ('terraces' 
are also used for some farm fields!).

> 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.

But it is not a building! So building=terrace is totally incorrect for 
this kind of terrace.

Are the tables and seats fixed? Or do they get moved?
If fixed .. I'd tend to go with man_made=table and man_made=seat.
However that are over 400 amenity=table in the data base, so look for 

As for the area .. similar issues exist for 'square', esplanade' and 
Some areas are not 'pedestrian' but for sitting, not walking/promenading.

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