On 13/01/13 15:21, Aidan McGinley wrote:
Been toying with some ideas for how to use the ONS Postcode data[1].
One idea that I have been exploring is to check if the value for the
centre of the postcode is inside a closed way, and if so then tag that
way with the appropriate addr:postcode. I mocked up a script to check
this using the overpass API. Some sample output is in the attached
link [2]. Essentially the output shows the postcode and the
associated way or ways that enclose it if more than one. I've
excluded ways tagged landuse=*. The script is pretty inefficient at
the moment, and needs to be optimised, but before I do that I wanted
to check with the wider community that this is a viable approach, and
if so the best way to do the import.
Worth noting that if the data were imported, then ways that map to
multiple postcodes would need to be excluded, as discussed previously
on the mailing list[3]
[1]
http://www.ons.gov.uk/ons/guide-method/geography/products/postcode-directories/-nspp-/index.html
[2] http://paste.ubuntu.com/1527642/
[3]
http://lists.openstreetmap.org/pipermail/talk-gb/2013-January/014336.html
In case you haven't seen it, I produce and maintain a postcode layer
based on ONS data that can be used in the editors. It helps determine
the postcode, but always as a manual process. You can see info here
[1] I doubt importing the data is practical and certainly would not be
welcomed by many. The resolution of the postcode centroids leaves doubt
as to the edge cases. The closest postcode centroid is sometimes related
to the properties on a different road, easy to spot by eye.
[1] http://onspd.raggedred.net/
--
Cheers, Chris
user: chillly
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