[Talk-GB] OSM coverage in Scotland and Wales

[Peter Reed]

I have done some preliminary measures of OSM coverage for Scotland and Wales
based on using NUTS-3 regional boundaries as common ground to compare DfT
figures for the length of roads in a local authority against the length of
roads in OSM.

 

NUTS-3 is the basis for EU regional statistics, and they publish the
boundaries as shapefiles. The precision isn't as great as you get from admin
boundaries on OSM, but there are missing admin boundaries in Scotland and
Wales, so this is a kind of stop-gap.

 

On the whole the boundaries match up reasonably well, and where they don't
exactly correspond, I  can normally aggregate the road length statistics for
a few authorities to get the figure for the equivalent NUTS region. It's
only in the Scottish highlands where this doesn't work too well. Bascially
the local authority for the Highlands crosses several NUTS regions, so I've
had to take average figures to cope with boundaries that are not aligned.

 

I realise the colouring could do with some work to make it more clear, but
first version of the resulting map is here -
http://www.reedhome.org.uk/Documents/OSMCover.png

 

The headlines are that Anglesey and Edinburgh look well covered. Glasgow,
Renfrewshire, Gwynedd are pretty good. While Powys, Aberdeenshire, Orkney
and Shetland are looking a bit thin. 

 

For anyone interested in doing a similar exercise elsewhere in Europe, there
are Eurostat figures for road lengths at the NUTS-2 level (i.e. the next
largest geographical grouping after those I am using here). 

 

Eurostat only split Motorways and Other Roads so dealing with dual
carriageways etc is going to be a bit iffy. However, I've done a quick
comparison of their numbers for the UK, and the rough figures ((motorways *
2) + other roads) gives me a total that isn't a million miles away my more
detailed calculations.

 

The Eurostat figures are here -
http://epp.eurostat.ec.europa.eu/portal/page/portal/region_cities/regional_s
tatistics/data/database under Regional Transport Statistics.

 

 

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[Talk-GB] OSM Coverage in Scotland and Wales

[Peter Reed]

I mean to add this to my previous message - and hit the button too quickly.

 

The shapefiles that I used for boundaries of the NUTS regions are here -
http://epp.eurostat.ec.europa.eu/portal/page/portal/gisco/popups/references/
Administrative%20units%20and%20Statistical%20units1

 

 

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Re: [Talk-GB] OSM coverage in Scotland and Wales

[Jonathan Bennett]

Peter Reed wrote:

 I have done some preliminary measures of OSM coverage for Scotland and 
 Wales based on using NUTS-3 regional boundaries as common ground to 
 compare DfT figures for the length of roads in a local authority 
 against the length of roads in OSM.

Peter,

Thanks for producing these maps, as they show that OSM's UK coverage is 
very lop-sided, which needs addressing. Could you change the colour map 
to have a greater level of contrast? I'm red-green colour blind, and 
most of Scotland looks the same colour to me. Even where I can see the 
different shades, I can't match them to the legend, because the 
background colours are different. Including more primary colours would 
help immensely -- start at primary red for 50%, for instance.

Thanks,

Jonathan

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