Unsubscribe me, please. :) 2009/7/19 <[email protected]>
> Send Talk-GB mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.openstreetmap.org/listinfo/talk-gb > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Talk-GB digest..." > > > 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) > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://lists.openstreetmap.org/pipermail/talk-gb/attachments/20090719/4c4e2acc/attachment-0001.htm > > ------------------------------ > > 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/<http://www.dft.gov.uk/pgr/statistics/datatablespublications/roadstraffic/roa%0Adlengths/> > . > > > > 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 -------------- > An HTML attachment was scrubbed... > URL: > http://lists.openstreetmap.org/pipermail/talk-gb/attachments/20090719/f430894f/attachment.htm > > ------------------------------ > > _______________________________________________ > Talk-GB mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-gb > > > End of Talk-GB Digest, Vol 34, Issue 23 > *************************************** > -- "But I, being poor, have only my dreams; I have spread my dreams under your feet; Tread softly because you tread on my dreams." -WB Yeats http://luminaryuprise.wikidot.com https://twitter.com/grassonmydesk
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