Hi, I'm not on about extrapolating postcodes for other buildings on a street, but we should be able to map the postcode of building on which the centroid is placed, shouldn't we? Zooming in should allow us to see which building a centroid is on.
Kind regards, Adam On Fri, 9 Nov 2018 at 13:44, Philip Barnes <p...@trigpoint.me.uk> wrote: > On Fri, 2018-11-09 at 13:26 +0000, David Woolley 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. > > > I live in such a road, it is big enough to have different postcodes for > odd and even numbers. The two centoids are very close together and it > would not be possible to determine which is which without local > knowledge. > > Phil (trigpoint) > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb >
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