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
