[Talk-GB] UK Postcode Error Reports

[Robert Whittaker (OSM lists)]

My daily report of addr:postcode value errors at
http://robert.mathmos.net/osm/postcodes/osm-errors.html seems to be
being used by at least one other person, since the numbers of errors
showing there has dropped significantly now. The page is regenerated
daily, but unfortunately the data hasn't been refreshed for a few days
now because the source data on which it relies (The Geofrabrik GB
extract via the GB Taginfo instance) hasn't been updated in that time.

I've also starting playing with a second report that lists location
discrepancies of postcode-tagged OSM objects compared with the
postcode centroid locations in Code-Point Open. This is less of an
exact science, since postcodes will not all be located at the centroid
for that postcode unit, and the allowable deviations vary depending on
the unit. However, you can find an initial list of postcodes that are
more than 1km from their official centroid at
http://robert.mathmos.net/osm/postcodes/location-errors.cgi -- there
are about 1500 of them, although quite a few are in groups where the
same postcode is on multiple neighbouring objects. Presumably most of
the 1500 will be cases of a typo being made by an editor or in the
data source they used, so they'll need manual checking and updating.

If anyone fancies looking at any of these please feel free to dive in.
If you find any false positives (i.e. errors in the processing, or
postcodes that genuinely are that far from their centroid), please let
me know, and I'll see if there's anything that can be improved in the
tool, or if they need to be marked manually as ok.

Robert.

-- 
Robert Whittaker