[Talk-GB] The current state of mapping houses in GB

[Ian Caldwell]

Should you also include building=residential as taginfo shows 1,404,975 for
GB?

It was my default in the past and I am still inclined to use it for a
building that might be a house or might be flats or maisonettes. And you
cannot decide from the aerial imagery .

Ian


On Tue, 13 Apr 2021 at 11:08, nathan case <nathancase at outlook.com> wrote:

> Hi all,
>
>
>
> Since the Terraced Houses Mapping thread got a little muddled, I thought
> I’d split this topic off. I did a little digging into how the GB (UK?) and
> IE communities currently maps houses using the taginfo pages. I think there
> was talk of creating a GB wiki page on this, so these stats might come in
> useful.
>
>
>
> Hopefully the table formatting is preserved. As of 13 April 2021:
>
>
>
>
>
> *Key*
>
> *Value*
>
> *Globally*
>
> *IE*
>
> *GB*
>
>
>
>
>
> global usage share
>
> share of local houses
>
>
>
> global usage share
>
> share of local houses
>
>
>
>
>
> (%)
>
> (%)
>
>
>
> (%)
>
> (%)
>
> building
>
> house
>
> 41,239,080
>
> 295,238
>
> 0.72
>
> 97.89
>
> 2,431,430
>
> 5.90
>
> 89.26
>
>
>
>
>
>
>
> building
>
> detached
>
> 3,554,017
>
> 3,241
>
> 0.09
>
> 1.07
>
> 106,061
>
> 2.98
>
> 3.89
>
> building
>
> semidetached_house
>
> 417,660
>
> 2,481
>
> 0.59
>
> 0.82
>
> 161,773
>
> 38.73
>
> 5.94
>
> building
>
> bungalow
>
> 148,887
>
> 648
>
> 0.44
>
> 0.21
>
> 24,727
>
> 16.61
>
> 0.91
>
> Total
>
> 4,120,564
>
> 6,370
>
> 0.15
>
> 2.11
>
> 292,561
>
> 7.10
>
> 10.74
>
>
>
>
>
>
>
> building
>
> terrace
>
> 974,064
>
> 16,248
>
> 1.67
>
>
>
> 189,514
>
> 19.46
>
>
>
>
>
>
>
>
>
> house
>
> *
>
> 115,942
>
> 73,547
>
> 63.43
>
> 24.38
>
> 16,739
>
> 14.44
>
> 0.01
>
> house
>
> detached
>
> 22,302
>
> 12,055
>
> 54.05
>
> 4.00
>
> 2,794
>
> 12.53
>
> 0.00
>
> house
>
> terraced
>
> 30,355
>
> 15,612
>
> 51.43
>
> 5.18
>
> 8,752
>
> 28.83
>
> 0.00
>
> house
>
> terrace
>
> 9,272
>
> 5,905
>
> 63.69
>
> 664
>
> 7.16
>
> house
>
> semi-detached
>
> 49,646
>
> 39,579
>
> 79.72
>
> 13.12
>
> 3,919
>
> 7.89
>
> 0.00
>
> house
>
> bungalow
>
> 110
>
> 0
>
> 0.00
>
> 109
>
> 99.09
>
> 0.00
>
>
>
>
>
> Main points:
>
>    - There are 2,723,991 houses currently mapped in GB (out of roughly 25
>    million). For this analysis, a house is defined by an area or node tagged
>    as: building=house, building=detached, building=semidetached_house, or
>    building=bungalow. Building=terrace is explicitly excluded, due to it being
>    applied to a row of terraces rather than an individual house, and other
>    minor tags are ignored.
>    - Building=house is, by far, the most popular tag with 89.26% of all
>    mapped GB houses being tagged as such.
>    - However, unlike in IE, the associated house=* sub-keys are not
>    widely used in GB (totally only 0.01% of all houses and 0.69% of all
>    building=house). Though, to note, the GB community is second globally
>    (behind IE) in their usage of these sub-keys.
>    - The other house-related top level building tags are in use, but
>    represent only a minor share of mapped houses in GB (combined total of
>    around 10%).
>    - For terraced houses, the mapping consensus is hard to tell because
>    there is no “building=value” for an individually mapped terraced house.
>    Most likely these are simply split into adjoining building=house. However,
>    it is worth noting that house=terraced represents 52.2% of all house=* tags
>    in GB.
>
>
>
> Conclusion:
>
> It’s clear that the GB community favours mapping houses using the
> building=house tag. However, the community very rarely includes the house=*
> sub-key. The community, therefore, seems to prefer to imply a house type by
> use of shared nodes, rather than explicitly tag the type.
>
>
>
> Cheers,
>
>
>
> Nathan
>
>
>
>
>
>
>
>
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