Hi, I ask because the 'centroids' do not appear to be centroids in a pure mathematical sense, they always appear to be placed on a building, never in open space. Now, if this were merely been done by attributing the centroid to the nearest building regardless of whether it actually belongs to the postcode or not, it would serve no purpose. It seems far more likely that it would be attributed to the nearest building belonging to that postcode. If this is the case then it gives us a way of tying these centroids to an actual building within each postcode area and that gives us something tangible to map. Can anybody suggest whether I'm onto something here?
Kind regards, Adam On Fri, 9 Nov 2018 at 13:27, David Woolley <for...@david-woolley.me.uk> wrote: > If centroid has the plain (mathematical) meaning of the word, it will > only fall exactly on the building centre if there is only one building > in the postcode area. > > In practice the building nearest the centroid might have its own > postcode, so you can't rely on the nearest building to the centroid > having that postcode. > > There are, at least theoretically (e.g. a C shaped postcode) where the > centroid is in an adjoining postcode. I imagine you would get this if > there was a cul-de-sac projecting into a crescent that was small enough > to have one post code. > > On 09/11/18 13:12, Adam Snape wrote: > > Hi, > > > > I agree with not mapping the centroids but... > > > > Is it the case that the centroids are always placed on a building which > > falls under that postcode? If so, wouldn't it be okay to tag the > > building with the appropriate postcode? > > > > Another idea: Given that postcodes (with few exceptrions) apply to only > > one street, would it be acceptable to add the postcode tag to the street > > where there is only one centroid on the street? > > > > Kind regards, > > > > Adam > > > > On Fri, 9 Nov 2018 at 12:26, Tom Hughes <t...@compton.nu > > <mailto:t...@compton.nu>> wrote: > > > > On 09/11/2018 11:44, David Woolley wrote: > > > On 09/11/18 11:34, David Woolley wrote: > > >> if you are only dealing with centroids, I think many have been > > mapped > > >> already, > > > > > > <https://taginfo.openstreetmap.org/search?q=uk_postcode_centroid> > > > indicates that at least 2500 have been mapped. > > > > Yes, but it's a stupid idea, so please don't... > > > > Tom > > > > -- > > Tom Hughes (t...@compton.nu <mailto:t...@compton.nu>) > > http://compton.nu/ > > > > _______________________________________________ > > Talk-GB mailing list > > Talk-GB@openstreetmap.org <mailto:Talk-GB@openstreetmap.org> > > https://lists.openstreetmap.org/listinfo/talk-gb > > > > > > > > _______________________________________________ > > Talk-GB mailing list > > Talk-GB@openstreetmap.org > > https://lists.openstreetmap.org/listinfo/talk-gb > > > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb >
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