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

[ndrw6]

I noticed you have excluded building=yes, building=residential and 
similar - that's how many, if not most, UK houses are mapped. I'm using 
building=yes exclusively simply because I add a lot of buildings and 
from aerial imagery I can't say for sure if a building is residential or 
not, or how many dwellings it contains. I don't also want to limit 
myself to mapping houses - while they are useful, commercial buildings 
are more important to me as they form a base for adding POIs later.

Not saying your tagging is wrong (of course) it is just a step up in 
accuracy and in many cases it needs a survey.

Thanks,

ndrw6

On 13/04/2021 10:57, nathan case 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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