Graham,
I don't think this is anything to do with your edit.
About the same time as you edited Finchale, somebody accidentally added
building=yes to the admin-area relation for North-East England, so the
whole region turned into a building.
It was fixed fairly quickly, and I think it has
Here is an alternative view of the National Byway as a KML overlay on OSM
Cycle Map.
http://www.reedhome.org.uk/Documents/osmembed.html?kml=http://www.reedhome.o
rg.uk/Documents/KML/natbyway.kml
http://www.reedhome.org.uk/Documents/osmembed.html?kml=http://www.reedhome.
It might be easier using this link - - http://tinyurl.com/3oondxj
Here is an alternative view of the National Byway as a KML overlay on OSM
Cycle Map.
http://www.reedhome.org.uk/Documents/osmembed.html?kml=http://www.reedhome.o
rg.uk/Documents/KML/natbyway.kml
Near to Littlewick Green there is an off-road section of Sustrans National
Route NCN4 which has series of gates across it. They are plotted as nodes on
the cycle path, tagged as barrier=gate.
The map is here - http://www.openstreetmap.org/?lat=51.5088
When thinking about maintaining boundary imports, there is a further
complication in that many boundaries follow other features - that are
already mapped with varying degrees of precision.
I can see a case for handling boundaries differently since the OS boundary
data is definitive - in the
There is more sophisticated analysis of OSM coverage using OS vector data
(http://povesham.wordpress.com/2010/04/04/openstreetmap-completeness-evaluat
ion-march-2010/ ), but for what it's worth, I have produced another simple
comparison between DfT statistics and the length of roads plotted on
tricky with the
abbreviations.
Graham.
On 1 April 2010 23:16, Peter Reed peter.r...@aligre.co.uk wrote:
A lot more farms are there as . Fm
It can't be that all farms are listed
as running the query only reveals 372
points with farm in the title.
Probably not enough to get too excited
A lot more farms are there as . Fm
It can't be that all farms are listed
as running the query only reveals 372
points with farm in the title.
Probably not enough to get too excited
about, maybe just deal with them manually?
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I've now updated the coverage spreadsheet and map for Scotland, the rest of
Wales and Northern Ireland.
http://www.reedhome.org.uk/Documents/OSMCoverMar2010.png
http://www.reedhome.org.uk/Documents/OSMCoverMar2010.csv
It's the first time I've tried to add N. Ireland. I can't find
It's been three months since I last tried to measure road lengths on OSM
against the Department for Transport statistics, and I thought there might
be some interest in how things are progressing.
At the moment this has only been updated where I already have decent admin
boundaries from OSM.
Apologies for bad link - it should now work OK.
http://www.reedhome.org.uk/Documents/OSMCoverMar2010.csv
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thought of it as being a significant enough
place to have a Trunk road, although it does have green signs. Have you
merged trunk and primary?
Regards
Graham.
On 29 March 2010 17:57, Peter Reed peter.r...@aligre.co.uk wrote:
It's been three months since I last tried to measure road
Bob,
Adding boundaries really isn't all that difficult. Like most of these things
it's easy to get hung up on some of the details beforehand, but it works out
that it's fairly straightforward in practice.
You seem to have understood the main points already.
For boundaries you will
As the weather improves we are all going to be out and about tracing roads
for OSM. So there are various discussions, and work under way to help find,
prioritise and then fill the most important gaps in the map. Larger towns
and bigger areas that need attention are fairly well known, but
Thanks for the interest.
I haven't tried to collect parish boundaries yet, but it's an obvious step
forward.
The first thing is to say that I wouldn't want a load of effort going into
supporting measuring stuff that is better spent mapping real stuff. So I
wouldn't want to encourage
Steve,
It needn't be parishes. For population data it looks as though I can get
down to ward level with up-to-date numbers from ONS.
http://www.statistics.gov.uk/statbase/Product.asp?vlnk=13893
Looking at the ONS lists there are about 9,000 wards in England (and about
10,000 parishes). It's
It occurred to me that the Pay scale areas that arrived with the OSM
Naptan import should be fairly thickly populated areas, so those with a
relatively low road density would highlight places where there were roads
missing from the map, and hence help to prioritise attention on plugging the
gaps.
work,
and (b) there's a chance that it might spark a better idea.
Peter Reed wrote:
It occurred to me that the Pay scale areas that arrived with the OSM
Naptan import should be fairly thickly populated areas, so those with
a relatively low road density would highlight places where there were
Thanks to Jonathan too.
I can certainly update this occasionally if that would be useful.
As it stands, comparisons between different areas are influenced too much by
how widely the area is drawn, so Edinburgh for example (which in reality is
very thoroughly mapped) looks as though it is
Thanks to both Andrew (wynndale) and Guy Colling for their comments on the
analysis of OSM coverage. There has certainly been a noticeable improvement
to Cornwall, and I am glad that I could help to highlight it.
On the situation in Ireland, I am only transferring GB content to my
database at
A few months ago I compared the length of roads on the OSM database against
the figures quoted by the Department for transport, and posted the results
here.
I've now updated the figures using the OSM database extract at the end of
2009.
The resulting map is here -
I've heard back from the Department for Transport on how they measure
motorway slip roads for their road length statistics, and it seems that they
don't.
Assuming that motorway link in OSM roughly corresponds to the slip roads
that DfT are omitting, that would explain why the length of
We've had a dicky broadband connection for the 24 hours or so, but it seems
to be OK now, so I've been able to upload the detailed coverage figures for
Scotland and Wales here -
http://www.reedhome.org.uk/Documents/SWcoverage.csv
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Name |Coverage
---+
---
Isle of Anglesey | 124%
Gwynedd
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
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
It will be perfectly obvious to all that I am no expert at this, but there
is another version of the OSM UK coverage map here
http://www.reedhome.org.uk/Documents/OSMCoverColour.png with brighter
colours. I've still faded the regions that use NUTS data slightly to try and
distinguish them from
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
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
I've just posted an updated map of UK coverage at
http://www.reedhome.org.uk/Documents/OSMCover.png
There are a number of significant changes in this version:
a) As I half suspected, there was an error in the way I was handling
map projections in the previous version. This resulted
FWIW I've uncovered the problem with estimating coverage of Buckinghamshire.
I was counting Milton Keynes twice. Like you do.
To fix it takes a few hours processing, and I mucked up on my first attempt.
I realise the tension is almost unbearable, but I'll get there eventually.
I have now fixed the problem I was having with measuring the length of roads
in Buckinghamshire, and I have uploaded a new map of UK road coverage here -
http://www.reedhome.org.uk/Documents/OSMCover.png
FWIW here is a close up view of London as well -
I've been trying to tidy up some admin boundaries, using Relation Analyzer
to find gaps. As far as I can tell all the upper tier authorities
(non-districts) in England are there now, and form complete polygons.
For a while I was stumped by what seemed to be some gaps around Nottingham.
It turned
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
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
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
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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