> > 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.sm...@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.sn...@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.step...@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 > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb > > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb > >
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