[Talk-GB] UK address project update

[Neil Matthews]

Would you still expect to add a POI if there is a containing building way?
What if there is a containing building way with an address?

Neil

Sent from my iPad

> On 13 Nov 2021, at 17:01, Christian Ledermann <christian.ledermann at gmail.com> wrote:
> 
> 
> A very big Thank You to Rob, Russ and Garret, this is fantastic work!
> 
> As an alternate idea:
> A mobile app or mobile-friendly website, that would display the map of the area you are according to the GPS coordinates, 
> where you can select the dot, and then only have to enter the house number (and/or House Name).
> That POI can then be uploaded to OSM.
> 
> In addition, this information could be enriched with data from FHRS, and potentially other sources 
> to tag businesses directly in the app.
> 
>> On Fri, 12 Nov 2021 at 20:49, Rob Nickerson <rob.j.nickerson at gmail.com> 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:
>> 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.
>> 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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> 
> 
> -- 
> Best Regards,
> 
> Christian Ledermann
> 
> Galway, IE
> Mobile : +353 (0) 899748838
> 
> https://www.linkedin.com/in/christianledermann
> https://github.com/cleder/
> 
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