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 <[email protected]
<mailto:[email protected]>> 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 ([email protected] <mailto:[email protected]>)
http://compton.nu/
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