I see a pipeline as analogous to a route, i.e. from one place to another, made up of many contiguous segments of varying types. Many of these segments may be (steel) pipes, but they may also be drilled through rock or whatever. A penstock is a particular function of certain pipelines, for example from high up to the turbine hall. This pipeline can be made of all kinds of segments, just like all other pipelines.
//colin On 2015-10-09 16:59, François Lacombe wrote: > Hi everyone, > > 2015-10-07 1:02 GMT+02:00 Warin <61sundow...@gmail.com>: > >> I'd like to think anything carrying waste water (sewer) would have a non >> permeable lining.. and that lining could be called a 'pipe' and thus it is a >> 'pipeline'. >> >> To me the 'tubes' in my house for carrying water/gas are pipes .. and as >> they are a line then they are pipelines! > > I'd like to consider the pipeline is almost replacable by its operator. > A tunnel, furthermore when it's shielded, carrying water isn't > replacable at all and its components aren't pipes at all. > > Digging rock to get a tunnel is a lot heavier than installing a > pipeline. It doesn't have the same environmental footprint too. > > Ok to say that sewerage facilities are almost pipelines, but > sometimes, they are drains or tunnel. > > 2015-10-09 16:28 GMT+02:00 Bryce Nesbitt <bry...@obviously.com>: > >> The problem with man_made + waterway on the same node, is both are top level >> tags. >> Here you'd want a refinement tag for pipeline. > > I prefer to say that both man_made=pipeline and waterway=* can be > standalone to have a meaning instead of the "top level" expression. > > The extension I propose (I'm not refining any existing values here) > isn't only focused on pipeline but on tunnels too. > Due to the reasons we talked this week it shouldn't only concern pipelines. > >> -- >> >> There are two valid but separate goals to keep in mind. Are you mapping >> the: >> * Visible surface features >> * The flow of material >> >> Both are valid mapping goals. For mapping the flow you want a continuous >> link of >> tags that imply water flow. That penstock comes from a reservoir or weir, >> passes through a generating station, and exits into a canal which dumps into >> a river >> or a sink. That flow could be one way or in the case of storage reservoirs >> two ways (pumped >> uphill at low demand times). >> >> Equally valid is mapping the surface expression only. Those are pipes >> sticking up out of the ground (a man made feature). > > I would like to map the visible surface features : man_made=pipeline > ONLY when the penstock is visible and composed of pipes > AND I would like to map the flow of material with waterway=penstock at > the same time. > > A penstock may be a pipeline but water is always flowing inside isn't it ? > > Cheers > > François Lacombe > > fl dot infosreseaux At gmail dot com > www.infos-reseaux.com [1] > @InfosReseaux > >> _______________________________________________ >> Tagging mailing list >> Tagging@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/tagging > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging Links: ------ [1] http://www.infos-reseaux.com
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