[Talk-GB] Postcode centroids

David Earl david at frankieandshadow.com
Fri Jan 21 10:13:53 GMT 2011


On 21/01/2011 10:10, Tom Hughes wrote:
> On 21/01/11 10:02, Kevin Peat wrote:
>
>> So I should delete the various admin boundaries in the db then as they
>> cannot be viewed on the ground?
>
> They may not be viewable on the ground, but they are real in the sense
> that somebody has defined them by reference to features on the ground.
>
> Postcode centroids are not real like that - in fact postcodes are not
> defined in a geographic way at all. Rather they are defined by lists of
> addresses. The centroid (and the bounding polygons that you sometimes
> see) are then generated algorithmically from the locations of those
> addresses.

That doesn't make them not useful.

David




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