I've uncovered and fixed a few errors in my previous estimates of the % of
UK roads included on OSM.
I discovered a few days ago that there were a few areas where different
boundaries overlapped, with the result that I was double counting some roads
in more than one local authority. The
I have now uploaded a summary of the figures for the UK coverage estimates
as a CSV file here - http://www.reedhome.org.uk/Documents/OSMCoverage.csv
Several people have expressed an interest in seeing the proportion of named
roads by local authority area. Those figures are included in the
Message-
Date: Tue, 11 Aug 2009 10:55:31 +0100
From: Peter Reed peter.r...@aligre.co.uk
Subject: [Talk-GB] Estimating coverage
I thought that comparing the area enclosed by the admin boundary on OSM with
the area published by national statistics would be a good indicator of
whether the boundary
The area figures are obviously including the wet bits. Bristol is half
water: http://news.bbc.co.uk/1/hi/england/bristol/7019663.stm
This article mentions Denny Island - which was absent from OSM. I've now added
it from the NPE map, although I don't know whether its location has changed
with
Interesting point from Paul (southglos) about slip roads. I've just worked
the numbers slightly differently and he seems to be right.
Adding up the total length of motorways in England according to DfT it comes
to 6,021km.
My total from OSM for England = 6,962km
On face value we have
On Tue, Aug 11, 2009 at 8:07 PM, Peter Reedpeter.r...@aligre.co.uk wrote:
What do you think – should I be ignoring “motoway_link” in the totals,
counting it as something else (and if so what?), do we just put this down to
the way DfT count the numbers, or is it just coincidence that the
Nick Austin wrote:
There are marker posts every 100 yards alongside the hard shoulder of all
motorways. I don't think slip roads have marker posts so if the DfT are
calculating distance by counting the marker posts then excluding slip
roads sounds a reasonable thing to do.
Nick
Pedant mode
Peter Reed wrote:
Interesting point from Paul (southglos) about
slip roads. Ive
just worked the numbers slightly differently and he seems to be right.
Adding up the total length of motorways in
England according
to DfT it comes to 6,021km.
My total from OSM for England =
2009/8/4 Peter Reed peter.r...@aligre.co.uk
Meanwhile, there is a nice map on the French Openstreetmap page showing
coverage of French Communes
http://files.meurisse.org/osm/2009/communes-20090801.png
I can read French a little, and I have tried to make out the background
from the Talk FR
Peter Reed wrote:
Thank you Emilie.
When you talk of adding a commune, do you mean adding (vectorising)
the boundary?
It looks as though you have access to a lot more detailed information
on boundaries in France than we have in the UK.
The UK administrative boundaries on OSM have
Peter Reed wrote:
There have been a number of attempts to estimate the level of UK
coverage, of varying levels of sophistication, but I've not seen any that
compare the length of roads mapped against actual road lengths.
Over the last couple of weeks, I've had a first attempt at doing
There have been a number of attempts to estimate the level of UK coverage,
of varying levels of sophistication, but I've not seen any that compare the
length of roads mapped against actual road lengths.
The Department for Transport publishes statistics on actual road lengths by
local
Of the authorities I have managed to measure, the following all show more
road mapped than the DfT believes exists:
There could be a number of reasons for this;
1.Our boundaries are plotted from old parish boundaries on NPE
typically. I had to move the Trafford/Manchester boundary in a
Peter Reed wrote:
Of the authorities I have managed to measure,
the following
all show more road mapped than the DfT believes exists:
Having mapped every road in Hull (Kingston-upon-Hull since today is a
Sunday), some are fairly new and may not appear on the DfT figures.
On 19 Jul 2009, at 11:54, Chris Hill wrote:
Peter Reed wrote:
Of the authorities I have managed to measure, the following all
show more road mapped than the DfT believes exists:
Having mapped every road in Hull (Kingston-upon-Hull since today is
a Sunday), some are fairly new and may
Hi,
Peter Miller wrote:
There is a relation for 'London Boroughs'. I wondered if we should produced
one for 'Regions of England', and 'ceremonial counties of England' and
add the appropriate relations to them.
Generally, relations that just serve the purpose of collecting things
are
On the problems with Hampshire - my only related experience is that I had
problems with POSTGIS unable to process a number of admin boundaries,
because they are plotted with loops in the boundary. I.e. the boundary
crosses over itself.
This mostly happened where the coast had been added to the
Frederik Ramm wrote:
Interestingly I joined this list a while ago because I had got my
hands on some admin boundary data for England and wanted to know if it
was any good (the answer was no). I then forgot to unsubscribe. I'm
still planning to extend the Geofabrik excerpts to cover all
FWIW I've now updated http://www.reedhome.org.uk/Documents/LGboundaries.csv
to include a list of local authorities in Scotland, Wales and N. Ireland.
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The way I have handled dual carriageways (and motorways) is to assume that
both carriageways are plotted separately on OSM. So the figure that
results
should be twice the length estimated by DfT. However, for primary roads,
DfT
themselves show the total length of primary road, and the
2009/7/19 Frederik Ramm frede...@remote.org:
Hi,
Peter Miller wrote:
There is a relation for 'London Boroughs'. I wondered if we should produced
one for 'Regions of England', and 'ceremonial counties of England' and
add the appropriate relations to them.
Generally, relations that just
Oh just a thought, does the calculations include toll roads? Do the
DfT monitor these in their figures? (M6 toll, Severn Bridge etc.)
Yes they do. It's in the notes on the DfT website that private toll roads
which form part of major routes are included, but private minor roads are
not.
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