I'm new so haven't seen that before, but that's really good. Now all
you need to do is split it up even more!
On 27/07/2009 22:13, Peter Reed wrote:
Last week I posted a note about my efforts to compare actual road
lengths (or at least Department for Transport statistics) against the
lengths of road that are now in the map for each local authority area
in England.
This is a quick follow-up on the discussion that resulted, and an
update on progress since.
Thanks to all the useful suggestions, I've now managed to find and fix
a number of areas where my analysis was double counting.
I've also improved the way different highway tags are translated so
that I match the DfT statistics more accurately.
I've discovered and cleared a few problems with the process that
resulted in data getting lost along the way, so my figures are now
more complete.
However, I still haven't managed to pick up all the admin boundaries
that I should be getting, and I'm still using some ceremonial
boundaries in place of the administrative ones.
That skews the results in places like Buckinghamshire and Kent, where
roads within a unitary authority are still counted inside the
neighbouring county.
Alongside fixing things, I've tried to tidy up my extract and load so
that they are more robust and easier to manage (my steep learning
curve on Postgresql and Postgis continues).
There is a first crude attempt at plotting it all here -
http://www.reedhome.org.uk/Documents/OSMCover.png
This isn't a definitive result, of course -- or even close to one.
There are still gaps that shouldn't be there, and more checking to do.
Meanwhile, thanks for the encouragement, Pete
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