[Talk-GB] UK address project update

[Tom Hughes]

As I understand it this isn't an import, so the answer to
conflation is that human editors will handle it as part of
reviewing and merging the data.

Tom

On 12/11/2021 23:08, Neil Matthews wrote:
> The most important question to me is: "What mechanism are you envisaging 
> to conflate with existing OSM data?"
> 
> For example, my local town has a large percentage of buildings mapped 
> individually, with addresses on a lot of those buildings.
> 
> Neil
> 
> On 12/11/2021 20:46, Rob Nickerson wrote:
>> Hi all,
>>
>> I wrote in September (see [1]) about an address project that OSM UK 
>> has kicked off. At the time I noted that one of the questions we 
>> needed to answer was which datasets we should use to get a set of 
>> "potential address locations" that will then be shown to contributors 
>> to help them collect the address information. In short there are two 
>> options:
>>
>> A. Open UPRN data
>> B. Using Cadastral (Land Registry) INSPIRE parcels to split 
>> generalised buildings from Ordnance Survey open data, and then taking 
>> the centroid of the split building.
>>
>> I am pleased to be able to share a map ( 
>> https://osm-uk-addresses.russss.dev/ ) showing both of these approaches.
>>
>> The map shows:
>>
>>   * UPRN points (Green dots)
>>   * LR Polygons (Blue areas)
>>   * Ordnance Survey split generalised buildings falling within a LR
>>     polygon (light brown areas)
>>   * The addressable locations from the LR Polygons & OS Buildings
>>     approach (Red dots)
>>   * The underlying OpenStreetMap map. Note that this means you might
>>     see two buildings in some locations: those from OS and those in
>>     OSM (grey areas)
>>
>> Firstly, please note that the red dots for Scotland are currently 
>> missing. Scotland's cadastral parties are published by ROS and will be 
>> added to our process early next week.
>>
>> Secondly, having reviewed a few areas for the Green and Red dots, we 
>> decided that the Red dots (LR Polygons & OS Buildings approach) gives 
>> a better set of addressable locations.I use the word "better" very 
>> much in a relative way. Neither approach is perfect but our view is 
>> that the red points are a little bit closer to what we want. They have 
>> fewer false positives which likely matters more. We're keen to get 
>> your view - do you agree? disagree?
>>
>> Finally, where the red points fall short are in dense city centres and 
>> areas with a high concentration of council houses. This is because of 
>> a lack of cadastral parcels in these areas (e.g. one large cadastral 
>> parcel for the whole area rather than individual cadastral parcels for 
>> each home or business unit). We are keen to get your ideas as to how 
>> to work around this. So far our ideas are:
>>
>>  1. Identify these locations and direct experienced OSMers to them
>>     (leaving the easy places for the new mappers we hope to attract)
>>     to add the address by ground survey.
>>  2. Or same as 1 but instead of the experienced OSMer having to do a
>>     ground survey (as might not live locally) allow them to "pull" the
>>     green dots through into the final user interface so that local
>>     people new to OSM can collect the address. This could be done by
>>     adding these to OSM; that is adding points to OSM that just have a
>>     UPRN or similar tag at first so that they can be made available in
>>     the map editor we are working on.
>>
>> Feedback and alternate ideas welcomed. I am particularly keen to know 
>> if you support idea 2 as typically we have avoided this in the past. 
>> For example we did not add the postcode centroids to OSM. This time we 
>> can add an addressable location with a UPRN, city, postcode and/or 
>> street name. The final details (house name / number) would then need 
>> adding via the crowdsource project.
>>
>> I hope this all made sense. If not, I'm happy to answer questions or 
>> arrange a virtual meeting.
>>
>> [1] 
>> https://lists.openstreetmap.org/pipermail/talk-gb/2021-September/027669.html 
>>
>>
>> Thank you,
>> *Rob*
>>
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-- 
Tom Hughes (tom at compton.nu)
http://compton.nu/