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

[nathan case]

Hi all,

A follow on from my earlier emails. I've now created a Wiki page with up-to-date stats as well as more detail about mapping.

https://wiki.openstreetmap.org/wiki/User:Casey_boy/GB_housing

I've also added other housing related tags for comparison.

Please feel free to comment in the discussion or respond here if I can add anything of use. I can also move to the GB section of the Wiki if folks think this may be useful.

Cheers.

From: nathan case <nathancase at outlook.com>
Sent: Tuesday, April 13, 2021 10:58 AM
To: Talk-GB <Talk-GB at openstreetmap.org>
Subject: [Talk-GB] The current state of mapping houses in GB

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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