both building=residential and landuse=residential are valid tagging (though, if possible then building=house or other more specific value is preferable)
May 14, 2020, 12:47 by [email protected]: > The residential tag should be used for an area not a house. > > On Wed, 13 May 2020 at 14:38, Donie Kelly <[email protected]> wrote: > >> Don’t buildings have tags? Did I see a residential tag? Is it used in all >> cases? >> >> > On 13 May 2020, at 13:24, Colm Moore <[email protected]> wrote: >> > >> > Hi, >> > >> > Inspired by seeing the estimate in the Microgrant application of 5.5 >> million buildings on the island of Ireland, I did some number crunching. >> > >> > I downloaded the populations of Kilkenny townlands (1,500+) from the CSO >> and analysed the population against the number of buildings per civil >> parish (100+) for County Kilkenny. This is assuming Kilkenny has all or >> nearly all buildings mapped. Based on my inspections, this is largely true. >> > >> > The CSO data is somewhat distorted for the Kilkenny city area (100+ >> townlands), due to the way the CSO have arranged the townlands and civil >> parishes. I could look at this in more detail, but there would be a few >> hours of effort (unless someone has a simple way of calculating number of >> buildings per area, for a large number of areas). >> > >> > I calculated the 'number of buildings per civil parish' using the >> Overpass Turbo query [building=* in "civilparishname, Kilkenny"]. Overpass >> Turbo gives a summary of the data in the bottom right corner of the screen, >> e.g. >> > >> > Loaded – nodes: 4261, ways: 867, relations: 2 >> > Displayed – pois: 0, lines: 0, polygons: 866 >> > >> > I took the number of polygons to mean the number of buildings (this >> might not be perfect - I don't know how those numbers add up). >> Additionally, some polygons, e.g. building=terrace represent several >> buildings, while in other cases buildings may have been crudely split or >> joined-up. >> > >> > Depending on the civil parish, we're looking at 0.32-2.29 polygons per >> capita (0.44-3.15 people per building). Rural areas ten to have more >> polygons per capita, especially due to farm outbuildings, while urban areas >> have fewer polygons per capita, due to apartments buildings and >> semi-detached buildings (e.g. two square houses joined together might have >> only six nodes). >> > >> > I also calculated 4.40-5.83 nodes per polygon. This means some civil >> parishes have predominantly rectangular polygons / buildings, whereas >> others have many L-shaped or other-shaped polygons / buildings. >> > >> > As I wasn't able to immediately get some 'number of buildings per civil >> parish' numbers (Overpass Turbo had problems returning them, possibly due >> to duplicate names and variations in name spellings), I had to calculate >> them from their component townlands, using the Overpass Turbo query >> [building=* in "townlandname, civilparishname, Kilkenny"]. >> > >> > Depending on the townland, we're looking at 0.23-8.00 polygons per >> capita (0.13-4.37 people per building) and 3.91-6.45 nodes per polygon >> (i.e. some townlands have large numbers of semi-detached or terraced >> buildings, whereas others have a high number of complicated-shape polygons >> / buildings or buildings with too many mapped nodes). It is usual to see >> more extreme spreads when looking at smaller areas. >> > >> > I'm coming up with about 5.4 million (close enough!) buildings for the >> whole island, assuming the pattern is the same everywhere. However, as >> shown by analysing the smaller areas, there is variation and the 'final' >> number will vary from that. Of course, given that OSM is an ongoing >> project, there will never be a final number. >> > >> > Colm >> > VictorIE >> > _______________________________________________ >> > Talk-ie mailing list >> > [email protected] >> > https://lists.openstreetmap.org/listinfo/talk-ie >> >> _______________________________________________ >> Talk-ie mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/talk-ie >> > _______________________________________________ > Talk-ie mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-ie > _______________________________________________ Talk-ie mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk-ie
