[Talk-GB] UPRN Locations Map

Andy Robinson ajrlists at gmail.com
Fri Jul 3 08:03:16 UTC 2020


As always Robert you have provided a useful tool and analysis.

Thanks & cheers
Andy

-----Original Message-----
From: Robert Whittaker (OSM lists) [mailto:robert.whittaker+osm at gmail.com] 
Sent: 02 July 2020 17:38
To: talk-gb
Subject: [Talk-GB] UPRN Locations Map

I'm not completely sure if/how we can best make use of the new OS
OpenData (UPRNs, USRNs and related links) in OpenStreetMap, but as a
first step I've set up a quick slippy map with the UPRN locations
shown:

https://osm.mathmos.net/addresses/uprn/ (zoom in to level 16 to show the data)

The UPRN dataset literally just contains the UPRN number and its
coordinates (both OS National Grid and WGS lat/lon). There are some
additional linking datasets that link these ids to other ids (e.g.
USRNs, TOIDs). But no address information is available directly. (You
may be able to get street names by matching to OS Open Roads via TOIDs
though. Coupled with Code-Point Open, you might be able to assign
quite a few postcodes in cases where there's only one unit for a whole
street.)

The UPRN data has already helped me find a mapping error I made
locally though -- it looks like I'd accidentally missed drawing a
house outline from aerial imagery, and also classified a large garage
a few doors down as a house. The two errors cancelled out when the
houses were numbered sequentially, so I didn't notice until now. Today
though I spotted a UPRN marker over some blank space on the map, and
no marker over the mapped house that's probably a garage.

Now a few initial thoughts on the data that I've explored so far:

I believe that the UPRNs are assigned by local authorities, so
conventions may vary from place to place. I don't know who actually
assigns the coordinates (authority or OS). Looking at those for rows
of houses around me, they don't seem to have been automatically given
coordinates from the house footprint, it looks more like someone
manually clicking on a map.

The UPRN dataset should include all addressable properties. It is also
ahead of reality in some places, as it includes locations for houses
on a new development near me that have yet to be built yet. For blocks
of apartments/flats, the UPRN nodes may all have the same coordinates
or may be displaced from each other, possibly in an artificial manner.

Other objects also appear to have UPRNs. Likely things I've noticed so
far include: car parks, post boxes, telephone boxes (even after
they've been removed), electricity sub-stations, roads and recorded
footpaths (the UPRN locations seem to be at one end of the street, so
usually lie at a junction), recreation grounds / play areas,
floodlight poles (around sports pitches), and allotments. There's no
information about the object type in the UPRN data unfortunately.

Anyway, I hope some of this is useful / interesting. I hope to be on
the OSMUK call on Saturday to discuss things further. Best wishes,

Robert.

-- 
Robert Whittaker
https://osm.mathmos.net/

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