On 29 May 2015 at 03:06, John Willis <jo...@mac.com> wrote: > > > > On May 28, 2015, at 6:22 PM, AYTOUN RALPH <ralph.ayt...@ntlworld.com> > wrote: > > And with this argument for a hierarchical approach we are back to the > start point of umbrella tags that cover all possibilities which is > > landuse=educational as a polygon encompassing the whole area and the whole > range of educational facilities. > > using landuse=school excludes universities, colleges, etc and you would > then need other tags landuse=university and landuse=college, which then > makes the landuse tagging specific instead of general. > > If we look at http://wiki.openstreetmap.org/wiki/Key:landuse the first > sentence is correct "Mainly used for describe the *primary use* of land > by humans." > so the hierarchical approach should then be something like > landuse=agriculture... agriculture would then be sub categorised with > farmland (worked land for crops), orchard (trees planted for their fruits), > vineyard, pasture, etc. > landuse=residential (could be divided into urban and rural which have > totally different infrastructures) > landuse=commercial > landuse=industrial > landuse=educational > landuse=civic > landuse=transport > instead of the myriad of specifics that we now have like > landuse=peat_cutting and landuse=salt_pond....these are all sub categories > of the primary use of the land. > I know this has diverted from the main topic here but I wanted to point > out the overall usage to highlight how my suggestion fits into the overall > picture. > > > +1 > > There are advantages to certain separations (to make it easier on > renders), but there are so many very specific land land uses, while whole > categories don't have a single tag. > > A hierarchical system has room to accept new tags while keeping everyone > on the same level of importance. The downside is when one group or culture > sees a whole category in a different way - a primary road in Japan has a > completely different meaning than the rest of OSM, for example. > > But I prefer the hierarchical system - a flat tag system has good points, > but it's so hard to document and learn, and probably to keep renderer a up > to date - as a minor change requires a whole new tag, instead of a new > sub-tag value. > > I'm not aware renderers rely entirely on the key but use the value too - so highway=dual_carriageway wouldn't actually get rendered.
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