<div dir="ltr"><div>I really see no point. The data are already present in Nominatim (albeit perhaps not up-to-date) and search is the ONLY thing that so-called postcode centroids can help with. DE24 (Sinfin) was imported long ago, see this <a href="http://overpass-turbo.eu/s/MNZ">overpass query</a>.</div><div><br></div><div>What can be done is attempt to assign postcodes to streets, and various incomplete efforts have been made over the years. Open Data provides full addresses for around 70% of UK postcodes (principally Companies House, Food Hygiene & National Register of Social Housing). </div><div><br></div><div>What would be useful is a maintained set of postcode information based on codepoint open/ONS postcode data/OS Local. The sorts of things which it would be useful to know are:<br></div><ul><li>Is the postcode centroid co-located with others (e.g., delivery offices, some businesses, blocks of flats)</li><li>Can the postcode be unambiguously assigned to a street & post town?</li><li>Is the post code in use or not (ONS is now obviously 8 years old, but still potentially useful). Greg's FHRS tracker does appear to indicate a degree of churn with inner-city postcodes (although some of this will be inadvertent use of more general rather than specific postcodes by people filling in the FHRS forms)</li><li>Is a postcode the sole postcode for that street?</li></ul><div>Somewhere I have an old CPO table with some of this data populated. I think Geolytix had summary info associated with their post code sector shape files as well.</div><div><br></div><div>Adding addr:postcode to streets which have a single postcode is in my book fine: numerous LAs put this on street signs (Rushcliffe & Gedling for sure); it's an intermediate step to adding the addresses to houses Once the postcodes which obviously belong to a single street are eliminated it's often easier to work out where the others belong.</div><div><br></div><div>Note that other than for FHRS we have no good source for Northern Ireland postcodes at all. Equally assignment of rural postcodes is quite a bit harder than urban ones. In re-reading bits of Chris's blog last night I came across a <a href="https://chris-osm.blogspot.com/2017/03/have-you-moved.html">post of his</a> showing that some postcodes move huge distances between releases.</div><div><br></div><div>Jerry</div><div><br></div><div>PS. The Sinfin postcodes possibly should be removed as they were added IIRC before Mike Collinson's discussions with OSGB about OS Open Data.</div></div><br><div class="gmail_quote"><div class="gmail_attr" dir="ltr">On Wed, 2 Oct 2019 at 13:44, Russ Phillips via Talk-GB <<a href="mailto:talk-gb@openstreetmap.org">talk-gb@openstreetmap.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
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<p>Hi,</p>
<p>I'm wondering if it would be feasible and advisable to import the
UK postcode data from <a href="https://wiki.openstreetmap.org/wiki/Ordnance_Survey_OpenData#Code-Point_Open" target="_blank">OS
OpenData Codepoint</a>.</p>
<p>The licence is OSM compatible. My thinking was that we could
create a node for each data point and set the addr:postcode tag.
This would be useful for routing software like OsmAnd, since it
would allow a user to enter a postcode as a destination.</p>
<p>I'm happy to do the work, but the <a href="https://wiki.openstreetmap.org/wiki/Import/Guidelines" target="_blank">import
guidelines</a> say that imports should be discussed on the
imports@ list and the appropriate local communities, hence this
email.</p>
<p>Russ Phillips</p>
<p><br>
</p>
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