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2009/7/19 Sarah McCulloch <[email protected]>:
> Unsubscribe me, please. :)
>
> 2009/7/19 <[email protected]>
>>
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>>
>> Today's Topics:
>>
>> 1. Isle of Man mapping party - 1 August (Dan Karran)
>> 2. Potlatch "Integrity" button. (Chris Andrew)
>> 3. Re: Potlatch "Integrity" button. (WessexMario)
>> 4. Estimating coverage (Peter Reed)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sat, 18 Jul 2009 19:36:46 +0100
>> From: Dan Karran <[email protected]>
>> Subject: [Talk-GB] Isle of Man mapping party - 1 August
>> To: [email protected]
>> Message-ID:
>> <[email protected]>
>> Content-Type: text/plain; charset=UTF-8
>>
>> Hi everyone,
>>
>> I've just added some information to the wiki about a mapping party I'm
>> planning to hold on the Isle of Man in two weeks time, Saturday 1st
>> August. If there's anyone on this list that would like to come along,
>> please add your name to the wiki page at
>> http://wiki.openstreetmap.org/wiki/WikiProject_Isle_of_Man
>>
>> There's also a post about it at
>> http://www.dankarran.com/blog/2009/07/help-map-the-isle-of-man
>>
>>
>> Cheers,
>> Dan
>>
>> --
>> Dan Karran
>> [email protected]
>> www.dankarran.com
>>
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Sun, 19 Jul 2009 06:51:44 +0100
>> From: Chris Andrew <[email protected]>
>> Subject: [Talk-GB] Potlatch "Integrity" button.
>> To: [email protected]
>> Message-ID:
>> <[email protected]>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hi, all.
>>
>> Some time ago, I realised from this list that it is possible to get an
>> overlay on OSM of mapping errors, such as roads that don't join, bad tags
>> etc. I can never remember how to turn this on. Would it be possible for
>> Potlatch to have an on/off button for this feature? I think this could
>> hugely improve mapping integrity for the project. This would also have the
>> long-term benefit of improving routing for projects such as Navit and
>> OpenSatNav.
>>
>> What does anyone think?
>>
>> Chris (chris_debian)
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>> ------------------------------
>>
>> Message: 3
>> Date: Sun, 19 Jul 2009 09:04:35 +0100
>> From: WessexMario <[email protected]>
>> Subject: Re: [Talk-GB] Potlatch "Integrity" button.
>> To: "talk-gb OSM List (E-mail)" <[email protected]>
>> Message-ID: <[email protected]>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Chris Andrew wrote:
>> >
>> > Hi, all.
>> >
>> > Some time ago, I realised from this list that it is possible to get an
>> > overlay on OSM of mapping errors, such as roads that don't join, bad
>> > tags etc. I can never remember how to turn this on. Would it be
>> > possible for Potlatch to have an on/off button for this feature? I
>> > think this could hugely improve mapping integrity for the project.
>> > This would also have the long-term benefit of improving routing for
>> > projects such as Navit and OpenSatNav.
>> >
>> > What does anyone think?
>> >
>> > Chris (chris_debian)
>> >
>> Hi Chris,
>>
>> try using the keepright site, it does exactly that
>>
>>
>> http://keepright.ipax.at/report_map.php?lat=51.4336&lon=-2.17892&zoom=13&layers=B0T
>>
>>
>> Mario
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 4
>> Date: Sun, 19 Jul 2009 10:41:27 +0100
>> From: "Peter Reed" <[email protected]>
>> Subject: [Talk-GB] Estimating coverage
>> To: <[email protected]>
>> Message-ID: <002701ca0855$17b59920$4720cb...@[email protected]>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> 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 authority here
>>
>> http://www.dft.gov.uk/pgr/statistics/datatablespublications/roadstraffic/roa
>> dlengths/.
>>
>>
>>
>> The number of complete administrative boundaries plotted on OSM has shot
>> up
>> in the last few weeks, so it's now possible to compare actual road lengths
>> (or at least DfT statistics) against the lengths of road that are in the
>> map.
>>
>>
>>
>> Over the last couple of weeks, I've had a first attempt at doing this for
>> about 100 local authorities with decent boundaries.
>>
>>
>>
>> Of the authorities I have managed to measure, the following all show more
>> road mapped than the DfT believes exists:
>>
>>
>>
>>
>> London Borough of Kingston upon Thames
>>
>> 111%
>>
>>
>> Birmingham City Council
>>
>> 109%
>>
>>
>> Rutland County Council
>>
>> 108%
>>
>>
>> London Borough of Richmond upon Thames
>>
>> 107%
>>
>>
>> Portsmouth City Council
>>
>> 106%
>>
>>
>> City of London Corporation
>>
>> 105%
>>
>>
>> London Borough of Waltham Forest
>>
>> 105%
>>
>>
>> London Borough of Merton
>>
>> 105%
>>
>>
>> London Borough of Redbridge
>>
>> 104%
>>
>>
>> Solihull Metropolitan Borough Council
>>
>> 104%
>>
>>
>> Reading Borough Council
>>
>> 104%
>>
>>
>> London Borough of Hounslow
>>
>> 103%
>>
>>
>> Kingston-upon-Hull City Council
>>
>> 103%
>>
>>
>> London Borough of Sutton
>>
>> 103%
>>
>>
>> Isle of Wight Council
>>
>> 103%
>>
>>
>> London Borough of Barnet
>>
>> 102%
>>
>>
>> London Borough of Islington
>>
>> 102%
>>
>>
>> London Borough of Enfield
>>
>> 102%
>>
>>
>> Southend-on-Sea Borough Council
>>
>> 102%
>>
>>
>> London Borough of Brent
>>
>> 100%
>>
>>
>> London Borough of Haringey
>>
>> 100%
>>
>>
>>
>> Given the scope for error in all this, the figures don't look too silly,
>> and
>> at least they suggests a pretty high level of coverage in these places.
>> Eyeballing the map tends to confirm this.
>>
>>
>>
>> My measurements on the following authorities show the map holding less
>> than
>> half the roads that DfT believes exist:
>>
>>
>>
>>
>> Ceredigion County Council
>>
>> 49%
>>
>>
>> Gateshead Metropolitan Borough Council
>>
>> 48%
>>
>>
>> Blackburn with Darwen Borough Council
>>
>> 45%
>>
>>
>> Stoke-on-Trent City Council
>>
>> 45%
>>
>>
>> Middlesbrough Borough Council
>>
>> 44%
>>
>>
>> Rochdale Metropolitan Borough Council
>>
>> 42%
>>
>>
>> Cornwall County Council
>>
>> 42%
>>
>>
>> Bolton Metropolitan Borough Council
>>
>> 41%
>>
>>
>> Sunderland City Council
>>
>> 41%
>>
>>
>> Borough of Telford & Wrekin
>>
>> 41%
>>
>>
>> South Tyneside Council
>>
>> 40%
>>
>>
>> Barnsley Metropolitan Borough Council
>>
>> 40%
>>
>>
>> Darlington Borough Council
>>
>> 34%
>>
>>
>> North East Lincolnshire Council
>>
>> 33%
>>
>>
>>
>> Again, there is considerable scope for error, but these at least suggest a
>> low level of coverage in these places.
>>
>>
>>
>> For anyone interested in the technicalities, I am doing this by loading a
>> Planet OSM extract into a Postgis database.
>>
>>
>>
>> There are about 100 authorities where I haven't yet managed to extract a
>> useable boundary, and a number of Counties where the ceremonial boundary
>> that is plotted doesn't match the administrative boundary used by DfT.
>>
>>
>>
>> I hope this proves useful - if only so to suggest where to holiday in
>> order
>> to make the biggest impact. Hint: Cornwall, Cumbria, Norfolk and N.
>> Yorkshire all seem to have a lot of un-mapped roads.
>>
>> -------------- next part --------------
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>> ------------------------------
>>
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>>
>> End of Talk-GB Digest, Vol 34, Issue 23
>> ***************************************
>
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>
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> Tread softly because you tread on my dreams."
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