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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