On 12/08/17 13:12, Dave F wrote: > I also think the 'is_in:country_code' along with all 'is-_in' tags are > redundant if there's a boundary tag..
In the past I thought that the is_in element was something of a problem, but it does have a place when one remembers that OSM is all about the data. "if there's a boundary tag" is the problem here if one is extracting a set of data? Processing a number of boundaries around a set of objects takes time, while cleanly managed is_in:admin_area with a proper hierarchy allows a much quicker lookup of information such as - in the case of the the UK - parliamentary boundaries, wards, historic county, NHS admin area and so on without having to physically draw every fine detail of these ever changing boundaries. BUT it only works well if there is a well defined hierarchy so tagging is_in:gb-ward http://geoportal.statistics.gov.uk/datasets/417e93f21c5c419283ac23abc8eedcce_0 gives all this data in a format we can freely use as with the other 'boundary' data. It is just a pity that 'postcode' is so badly organised that it quite regularly straddles these other boundaries, but is_in:gb-postcode would remove the need to add all of the associated address data to every object on a particular street, and for the vast majority of postcodes it WOULD also identify all of the other is_in: data at a higher level. It just needs an object defining is:gb-postcode and is:gb-ward to provide all the hierarchy ... without overloading the server with searches for all of the boundaries intersecting the original dataset? Of cause I am also still looking to maintain access to historic data, and this model makes it easy to check start and end dates of is:gb-postcode and is:gb-ward without having to maintain all of those boundaries actually in the base dataset - something which the majority of users seems to have decided against :( -- Lester Caine - G8HFL ----------------------------- Contact - http://lsces.co.uk/wiki/?page=contact L.S.Caine Electronic Services - http://lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk Rainbow Digital Media - http://rainbowdigitalmedia.co.uk _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-gb
