[OSM-talk] postcode idea
simon at zymurgy.org
Fri Mar 31 16:40:31 BST 2006
Andy Robinson wrote:
> This is a good point. How does Royal Mail differentiate in their postcode
> database between a block area which has a common postcode and a specific
> address which has a unique postcode. As far as I can tell everything is
> based around areas but that the reference to that area is a point, does
> anyone know any different?
In the postcode data there's a delivery point count per postcode. That's
a count of distinct letter boxes that that postcode covers. For
instance, my home postcode covers one entire side of my street (delivery
point count of about 30), there's another postcode that covers the other
side. At work, there's a postcode that covers just one business. That
has a delivery point count of 1.
The addresses with a delivery point count of 1 have the grid northings
and eastings specific to that address, the ones for a street have the
grid reference either averaged, or put at one end of the address range.
> For OSM I personally think that postal codes can fit any of the node,
> segment, way or area features in the database. We are not necessarily trying
> to replicate a postal code database but rather provide postal code
> information for OSM database features.
Agreed. There's not a chance that we'd ever collect and maintain the
full set of postcodes anyway. The best that can be achieved is a
More information about the talk