They weren't imported nationally. I used boundary line in the Tendring district of Essex (once it became available) to replace those I'd previously traced from ooc maps, in case they'd changed.
Oh, and if you have boundary line in QGIS can you check whether the southern boundary of Caister goes through the middle of Haven Seaside where I was last weekend, or goes around the park as I noticed on at least one other online source, please? I've been meaning to download a newer set of data to check. Ed ________________________________ From: Steve Doerr <[email protected]> Sent: Sunday, June 22, 2025 7:08:08 PM To: [email protected] <[email protected]> Subject: Re: [Talk-GB] Parish boundaries and physical features On 21/06/2025 14:55, Daniel Hatton via Talk-GB wrote: > > It looks like, on OSM, we have parish boundaries in England imported > as a numerical dataset from an OS OpenData product (they're tagged > source:OS_OpenData_Boundary-Line). Unfortunately, the boundaries in > this dataset appear to have been polygonized with a rather coarse > granularity - about 15 metres. There are a few places in my area > where this coarse granularity seriously obscures the fact that the > actual parish boundary coincides with (and is quite likely legally > defined by) a physical feature (mostly either the centreline of a > watercourse or one bank of a watercourse). Compare, for example, the > specification of the parish boundary we have at > <https://www.openstreetmap.org/edit#map=18/52.116673/0.157049> with > the finer representation of the parish boundary in the same area > available from <https://maps.cambridgeshire.gov.uk/mycambs.aspx> or > <https://www.ordnancesurvey.co.uk/election-maps/gb/>. I have BoundaryLine loaded into QGIS, and it looks to me like the boundary mapping in this area is at best a simplified version of BoundaryLine. This suggests to me that something in the original import resulted in a loss of resolution. If that's the case, it might be best to try to reimport the BoundaryLine data more accurately. -- Steve _______________________________________________ Talk-GB mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk-gb
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