On 11/09/2012 10:47, Matt Williams wrote:
On 10 September 2012 23:07, David Fisher <[email protected]> wrote:
My other (related) question is to do with postcodes. Some postboxes nearby
have been tagged not only with "ref=xxx" (containing the first part of the
postcode plus a reference no.) but also "postal_code=xxx" (again containing
the first part of the postcode), meaning that, again, a lot of streets &
POIs become identified by Nominatim with this postcode (e.g.
http://www.openstreetmap.org/browse/node/363996567). Should *all* postboxes
be tagged with "postal_code" in this way? What about streets themselves?
For streets, does the (first part of the) postcode need to be displayed on
the street sign for this to be done?
The 'ref' part will be directly from the postbox label itself. I'd
imagine that the majority of the postal_code entries are from
http://dracos.co.uk/made/locating-postboxes/. Unless we have another
source of postcode data I'm not aware of? Even with the Dracos stuff,
I'm unsure of the licensing details.
I think most of the postal_code tags on postboxes are just based on the
ref. eg if the ref on the box is "SE25 29", it is assumed the postbox is
in the SE25 postcode, so it is tagged as postal_code=SE25.
Though I'm not sure how helpful this is. It may not always be accurate -
I have seen a few postboxes with a ref for one postcode, when they are
clearly in a different postcode area. And even two adjacent postboxes
with refs for different postcodes.
Maybe this is just Royal Mail mixing up the labels on postboxes. Or
maybe the postbox is emptied as part of a different delivery route.
Especially meter mail postboxes - they often seem to have 'wrong' refs.
Craig
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