Talk:Tag:building=semidetached house

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Discuss Tag:building=semidetached house here:


Confusing picture

SeacroftSemis.jpg

Confusing picture. First, one needs to inspect it very carefully to actually note that the main building is a semi. Second, the fact that there is a second semi on the right might lead people to consider each building as one part of a semi (That is, there is only one semi_detached house on the entire picture.) It would be much better to show *one* building which can be more clearly identified as semi. --Limes12 (talk) 09:28, 24 June 2020 (UTC)

I agree. Chris2map (talk) 20:09, 24 June 2020 (UTC) -- Possible replacements:
They are all better. No 4 is funny but maybe not the best choice as a representative example due to the different colours. As I always liked Victorian brick houses (despite their lack of proper insulation), I would vote for No 2. --Limes12 (talk) 22:01, 24 June 2020 (UTC)
Good choice! No 2 has 2 clearly recognisable houses with 2 accentuated entrances and a pleasant composition of colours and perspective. From my side, you can replace it. --Chris2map (talk) 18:41, 25 June 2020 (UTC)
Swapped. Thank you for your help!--Limes12 (talk) 08:43, 26 June 2020 (UTC)

is this for half the building or the whole building?

The text of this page isn't clear whether a duplex should be tagged as a single building=semidetached_house or two connected building=semidetached_house ways? If this is like building=terrace then it seems like a pair of semidetached houses could be mapped as a single building=semidetached_house or as two building=house. If that's the case, then it should probably be explained explicitly. -DBaron (talk) 00:45, 23 October 2020 (UTC)

I found multiple contradicting sources (very frustrating):
Based on tarreced houses it would probably make sense to mark them as house. Though in that case the answer at osm help should be fixed.....
--CMorty (talk) 15:10, 1 January 2021 (UTC)
For me, it only makes sense to map the halves as separate entries, so individually. At least in Germany they are own houses (own address, own entrance, own property), only the construction method is special, namely built side by side. --Chris2map (talk) 15:20, 1 January 2021 (UTC)
I pondered this a bit. As a semi-detached house is basically a terraced house with only two houses, the same rules should apply. Unless someone complains here within the next days, I'll apply Cunningham's Law and adjust the main page accordingly. -- CMorty (talk) 16:44, 8 January 2021 (UTC)
Hmmm, the mapping practice that I know of in Germany is the detailed one, in that each home is mapped separately. After I have thought again longer about it, I see now nevertheless also a problem with this mapping. If one wants to determine the number of existing duplexes, the double number comes out in this way. On the other hand, I find the way appropriate, since it is about separate properties and addresses. Actually the key value should then describe a half, so semidetached_house_half would fit better. Regards --Chris2map (talk) 21:22, 8 January 2021 (UTC)
Ok, I'll give it two more days or so and then I'll change it to the following:
  • Tagging should be in the same way as terraced houses (both=semidetached_house, single=house).
  • Alternate tagging is an option if one wants to me more detailed
  • Add some links and motivation for this decision
  • I'll can also fix the German translation and OSM-help
--CMorty (talk) 10:49, 10 January 2021 (UTC)
@CMorty Thanks for letting me know about the discussion.
Literally, the term "semi-detached" already describes that it is about a house detached only on one side. Nevertheless, there should be a clear understanding of the definition of a semi-detached house. So here is some quick research:
  • English wikipedia [1]: A semi-detached house (often abbreviated to semi) is a single family duplex dwelling house that shares one common wall with the next house.
  • Collins dictionary [2]: A semi-detached house is a house that is joined to another house on one side by a shared wall.
  • Cambridge Dictionary [3]: A house that is semi-detached is one that is joined to another similar house on only one side.
  • Dictionary.com [4]: partly detached of or relating to a house joined by a party wall to another house or row of houses.
In that context I see a pretty common understanding that a semi-detached house is defined as only one half of a duplex unit and not the whole unit together. The established German term Doppelhaushälfte reflects this definition. Determining the number of existing duplexes (be it the whole unit or each semi-detached house) is not a problem of how this tag is defined but that it apparently has not been properly defined by now.
@CMorty: Referring to your link to Cunningham's Law: Please don't knowingly post wrong definitions to the wiki as this will only worsen the situation and frustration of others, especially not English native speakers.--Kjon (talk) 12:13, 10 January 2021 (UTC)
@Kjon: While my gut agrees with you, my desire for consistency disagrees. Two more points:
  • The page already states: Interconnected homes of more than two units (commonly called a "triplex", "quadruplex", or more generally a "multiplex" should be tagged as building=terrace or building=house, depending on the configuration of the units. which for me implies, that a semidetached_house is a building of two units.
  • How should a the building of two units be tagged (in alignment with terrace)?
I somehow come to the conclusion, taking Chris2map's arguments and consistency into account, that a semidetached_house should apply to the two units, however the name is very badly chosen, as a semi detached house is the name for a single unit. @Kjon: Do think it is reasonable to discuss this on the main page, pointing out that using the tag can be problematic; and suggesting to map two houses and mark them both as house in consistency with terraced houses? I'm open to other suggestions on how to clarify this.
I guess, broadening the discussion and including some English native speakers makes sense. Tagging mailing list might be a good spot to discuss.--Kjon (talk) 20:55, 10 January 2021 (UTC)
I only now realized that we all come from SchwäbischHall-Wüstenrot-country. I think it is good when you bring the discussion to a broader level. For the time being, both variants should be allowed, possibly with a hint to look around for the common practice in the respective region. --Chris2map (talk) 19:41, 12 January 2021 (UTC)
There is also prior discussion about this topic but without a conclusion on the tagging mailing list: https://lists.openstreetmap.org/pipermail/tagging/2015-September/026545.html --K4pl4n (talk) 17:50, 5 February 2021 (UTC)