OK, I did a little more reading.... but it turns out that the actual order ( https://www.legislation.gov.uk/uksi/2022/37/note/made ) simply says 'the new ward boundaries are those shown on the map in the Commission's office ... and here's a link to an electronic version of the same map'.... which is the one I already used as my reference to make the OSM edits. (It's just as OS StreetView map.... not especially detailed)
And it says 'Where a boundary is shown on the map as running along a road, railway line, footway, watercourse or similar geographical feature, it is to be treated as running along the centre line of the feature.' ... which is how I tagged it. The railway line in question was dual track, so I drew a boundary line in the middle between the two tracks. Where the road in question was drawn as a dual carriageway on OSM, I drew a boundary line in between the two ways. On Mon, 21 Feb 2022, 21:49 Colin Smale, <colin.sm...@xs4all.nl> wrote: > If the position of the boundary is imported from a source that ultimately > has a very high precision, for example Ordnance Survey or a Council's GIS > system through a shapefile or similar, then the location as recorded in OSM > will likely be more accurate than what would be obtained from tracing from > aerial photos. In other words, if a boundary and a road/railway/etc > *almost* coincide, more consideration should be given to moving the road to > match the imported boundary than the other way around. > > Having said that, the exact line of a boundary tends to get frozen at the > moment the Order is made, even if the road/railway/etc is subsequently > realigned. I strongly recommend that boundaries and other features do *not* > get combined or even share nodes, unless it can be demonstrated that the > link between them is dynamic, i.e. a change to one necessarily means a > change to the other. > > On 02/17/2022 3:41 PM David Davis via Talk-gb-london < > talk-gb-london@openstreetmap.org> wrote: > > > > Yeah Tom, > this is conclusion I reached too: > if a ward boundary is legally defined as being a particular geographical > feature (e.g. centre line of a road) then it is better to have that way on > OSM tagged with a relation (even if its position is a metre or two off > perfect) rather than have another line imported and tagged as the boundary. > And probably even worse: if the road *is* in precisely the right position, > neither is it helpful to have another imported line superimposed right on > top of it, as it makes it very fiddly to try and edit them subsequently. > So, slightly timeconsuming as it is, I think it's probably best to set > them up manually. > > On Thu, Feb 17, 2022 at 1:55 PM Tom Chance <t...@acrewoods.net> wrote: > > I've previously found it valuable to have the ward boundaries in OSM, and > am responsible for all the Southwark (not Lambeth) ward boundaries, plus a > few Lambeth, Croydon and Bromley. Sometimes the misalignment of open data > and OSM data can lead to mistakes. It's not a big deal if they aren't in, > but I don't see any reason to say they *shouldn't* be. > > If you're going to update them (great!) I think they work better as > relations using - where relevant - existing objects like roads where they > go down the middle of a road. Otherwise, again, things can get misaligned > and otherwise go wrong. So a straight import isn't as good an option as the > rather more painstaking manual approach. > > Tom > > m: 07866 447 075 > w: http://tomchance.org > > > On Wed, 16 Feb 2022 at 11:46, Russ Garrett <r...@garrett.co.uk> wrote: > > My controversial opinion is that these shouldn't be in OSM. > > The definitive boundaries are freely available as open data in OS > Boundary Line (although they won't usually appear there until after > the boundaries take effect). The current UK-wide coverage of ward > boundaries in OSM is pretty minimal, although it looks like most of > the old Lambeth wards are in OSM: > > > http://overpass-turbo.eu/?q=W291dDpqc29uXVt0aW1lxIHEgzI1XTsKKAogIG53clsiYsSBbmRhcnkiPSJwb2xpxItjYWwixInEqMSqxKxpxK5sX2RpdmlzacSHxKYid8SjZMSxKHt7YsSfeH19KcSUxY8KxI8gxJ9kecSUPsSUxZNza2VsIHF0Ow&c=BJp6-ioHTL > > As someone who uses this boundary data relatively frequently, there's > no reason why I should use OSM when the data is incomplete, and > boundaries in OSM may have been altered (accidentally or otherwise). > They're not surveyable, the data is freely available elsewhere - I > don't see why it's worth spending our time making sure it's replicated > in OSM. > > Cheers, > > Russ > > On Wed, 16 Feb 2022 at 11:27, David Davis via Talk-gb-london > <talk-gb-london@openstreetmap.org> wrote: > > > > Hello, > > a complete revamp of the electoral wards in Lambeth borough comes into > effect in May 2022, with 25 new wards. > > (See > https://love.lambeth.gov.uk/a-new-political-map-for-the-2022-lambeth-borough-council-elections/ > for info). > > > > I'm guessing the boundaries are available as open data, > > and some bright spark on this list will know how to import it into OSM > in a hugely more efficient way that me trying to manually draw and tag the > new boundaries...? > > (Amusingly, on the map on Lambeth Council's page about it, someone > literally has just drawn the boundaries by hand on top of a screengrab from > OSM!) > > > > Anyone interested this task? > > > > (A few of the existing Lambeth wards were tagged on OSM already, but the > majority actually weren't. But every existing ward boundary is changing in > any case...) > > _______________________________________________ > > Talk-gb-london mailing list > > Talk-gb-london@openstreetmap.org > > https://lists.openstreetmap.org/listinfo/talk-gb-london > > > > -- > Russ Garrett > r...@garrett.co.uk > > _______________________________________________ > Talk-gb-london mailing list > Talk-gb-london@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb-london > > _______________________________________________ > Talk-gb-london mailing list > Talk-gb-london@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb-london > >
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