Re: [Talk-GB] UK Postcode Error Reports

[Gregory Williams]

I think that most of the reduction was due to me going through the obvious 
formatting issues last weekend. I used an import from the Geofabrik GB extract 
into an osm2pgsql database looking at the addr:postcode and postal_code tags. 
The database enabled me to easily get the appropriate OSM object IDs such that 
I could download and fix each in turn using JOSM after using some judgement.

I've also fixed a few way-off postcodes when compared to the distances to that 
which OS OpenData CodePoint thought that their centroids were at -- things like 
postcodes in Edinburgh (EH) mistakenly typed in with an Enfield (EN) postcode 
-- also identified using my import into PostGIS. Cases which were less clear 
I've added notes for, to have local mappers review.

Gregory
⁣

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​

On 16 Nov 2016 20:36, at 20:36, "Robert Whittaker (OSM lists)" 
 wrote:
>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
>
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[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

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