[Talk-GB] Quarterly Project: Addresses and Postcodes

Steven Horner steven at stevenhorner.com
Thu Oct 19 12:00:25 UTC 2017


>
> Postcodes refer to points, not to polygons.

Are you saying a point in OpenStreetMap terms?

UK postcodes generally cover an area/polygon. How big that area is appears
to come down to how much mail that area is likely to receive, I think
that's how its described on Wikipedia. So it could cover one building, a
street or a huge area if rural.

Ordnance Survey sell CodePoint Polygons which is the polygons each postcode
covers. Obviously we can't use that.

On Thu, Oct 19, 2017 at 12:31 PM, Colin Smale <colin.smale at xs4all.nl> wrote:

> In the UK, this algorithm is useless if you expect to get the actual
> address that you could send a letter to, or that you could ask for
> directions to.
>
>
>
> On 2017-10-19 13:23, Marc Gemis wrote:
>
> Maybe it is interesting to repeat how Nominatim resolves addresses,
> just in case someone wants to do a search after adding an address.
>
> - Nominatim starts from an address point (or building way with
> address). It takes the house number from it and the street name.
> - It tries to match the street name with a nearby street.
> - The rest of the info, suburb, city, country, etc are taken from the
> way. i.e. it looks in which boundary the way lies and work its way up
> the admin levels.
> - In case there is no boundary, it can use a place node as well to
> determine the name of a certain admin level, but that is less precise
>
> - postal codes are taken from the address point, when specified. This
> is needed in UK/USA but not in e.g. Belgium or Germany.
>
>
> http://nominatim.openstreetmap.org is your friend to understand where
> the data is coming from.
>
> Of course, if you only work with a relational database (as Lester
> pointed out), one prefers all data on the address node.
> Relational DB with GIS extensions do not need this (e.g. Nominatim).
>
> Nominatim's approach currently has problems with streets on the border
> of e.g. 2 villages. Sara Hoffmann (Lonvia) told me that there are some
> plans to fix this.
>
> regards
>
> m.
>
> On Thu, Oct 19, 2017 at 10:35 AM, Adam Snape <adam.c.snape at gmail.com>
> wrote:
>
> I'm convinced that many such addresses are unnecessarily long (are there
> really multiple Weldons in the Swanscome postal area?). Nevertheless we
> should have a way of mapping them if they are the official address. I agree
> that more general guidance would aid consistency. My address mapping
> practice is as follows. I would welcome correction if others feel I am
> doing
> something incorrectly::
>
> The post town
> https://en.wikipedia.org/wiki/List_of_post_towns_in_the_United_Kingdom is
> tagged as addr:city (whether or not it is a city or indeed whether an
> otherwise more important place is nearer). Though this should all be in
> upper case when used I add the tag in lower case with an initial capital
> letter as it would normally be written in a sentence.
>
> For sub divisions of this area the wiki has documented tags addr:suburb and
> addr:hamlet. I tend to default to suburb everywhere except when dealing
> with
> an actual isolated hamlet. Where there are two subdivisions as in Steve's
> example, I'd use hamlet for the smaller one  and suburb for the larger one.
>
> The wiki suggests to avoid addr:street and addr:place together but I use
> them for things like named retail/business parks where there is also a
> street address eg. https://www.openstreetmap.org/way/527520264
>
> I do not tag the name of the property separately if it is the same as the
> main name=* tag
>
> Counties have not been formally part of postal addresses for many years.
> Royal Mail permits people to optionally add the name of the old Postal
> County, modern administrative or ceremonial county, or traditional county
> to
> their address according to their personal preference, but this plays no
> role
> in delivery. So I do not tag a county in the address.
>
>
> So I'd tag Steve's example: name=The Spring River, addr:street=Talbot Lane,
> addr:hamlet=Weldon, addr:suburb=Ebbsfleet Valley, addr:city=Swanscombe,
> addr:postcode=DA10 1AZ
>
> I hope that helps
>
> Adam
>
>
> On 18 Oct 2017 11:49 p.m., "Steve Doerr" <doerr.stephen at gmail.com> wrote:
>
> On 10/10/2017 19:07, Robert Whittaker (OSM lists) wrote:
>
>
> It doesn't seem to have been mentioned here yet, but this quarter's UK
> mapping project is to improve addresses and postcodes:
> https://osmuk.org/uncategorized/jump-in-to-our-quarterly-mapping-project/
>
>
> It would be useful to have some guidance on tagging for UK addresses. For
> instance, how would you tag the different elements of the following address
> for a pub/carvery that opened recently near me:
>
> The Spring River
> Talbot Lane
> Weldon
> Ebbsfleet Valley
> SWANSCOMBE
> DA10 1AZ
>
> Regards,
> Steve
>
>
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