[OSM-talk] UK metrics basis - How complete is your area?

Andy Robinson (blackadder) blackadderajr at googlemail.com
Wed Apr 30 18:52:46 BST 2008


As a follow up. wiki page is at:

http://wiki.openstreetmap.org/index.php/Completeness_Metrics

Cheers

Andy

>-----Original Message-----
>From: Andy Robinson (blackadder) [mailto:blackadderajr at googlemail.com]
>Sent: 30 April 2008 4:41 PM
>To: 'talk at openstreetmap.org'
>Subject: UK metrics basis - How complete is your area?
>
>Following on from Frederik's earlier snapshot statistics for Europe I
>thought I'd work out a hopefully more reliable measure basis for the UK.
>Hopefully it will help people evaluate their own areas to monitor progress.
>
>The evaluation was done for the area of Sutton Coldfield and adjacent wards
>running towards Birmingham. A total of 10 wards in all. This area I know is
>completely mapped out. I ended up with the following data:
>
>Population from ONS = 252,870
>Occupied Households from ONS = 106,068
>Total land area from ONS = 93914 (m2)(thousands)
>Area of Road from ONS = 8976 (m2)(thousands)
>Length of highways in OSM database = 836,035m (Anything lesser than
>"service" was ignored)
>
>So, the two main metrics I plan to use are:
>
>Assuming average road width (from above) is 10.74m then the "Area of Road"
>from ONS can be roughly transcribed to the total length of road for a given
>area.
>
>There is 3.306m of road per head of population.
>
>Obviously these figures are only going to work in urban conurbations in the
>UK, but hopefully they provide a basis from which to estimate progress.
>
>I'll knock up a wiki page with how I went about all of this.
>
>Cheers
>
>Andy
>
>
>






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