On Sat, 10 Aug 2019 at 17:27, Julien djakk <djakk.geograp...@gmail.com> wrote:
> > The "old" highway tag can give default values to the 5 new tags, so it > is not necessary to re-map everything :) > If it is a guaranteed 1:1 relationship then there is no point doing it. Maybe if the semantics became clearer (like migrating landuse=grass to landcover=grass) but that doesn't appear to be the case. But your scheme appears to offer much more details and more precision. So you might say that highway=primary automatically becomes a=x + b=y + c=z but that implies that a highway=primary might actually be a=x + b=y + c=w. So it is necessary to remap.everything in order to check whether the primary highway has c=z or c=w. It might not be urgent if there's no great practical difference between c=z and c=w, in which case there isn't much need for the new scheme. > > Yes you are absolutely right : I need my own renderer to populate the > new tags. I was thinking about putting anything (roads, summits, > footways, towns, trees …) with importance = 1 to the lower zoom, etc. > (Actually tag importance already exists, used for railways, has main > values regional or national). > Then you not only need your own renderer, you need your own database. Two of them, in fact. One to hold a regularly-updated copy of the OSM database and one holding your extra tags. Because you'll probably get a lot of opposition to the idea of you shoving your own tags into the OSM database for no reason than that you like the idea even though nobody else does. People have managed to get their own tagging sub-schemes accepted: the sea mark and historical objects tags come to mind. A lot of their stuff isn't rendered by anything other than their own carto (some things are, but most are not). BUT those tags aren't applied to every object in the database. Oh, and there's the problem that "importance" seems, at this stage, to be a subjective value decided by you but applied to everything. Even though for many practical purposes renderers make their own decisions about what to display at different zooms, you wish to impose your view on everything. The more you try to justify this idea, the less feasible it seems. The first law of holes comes to mind... -- Paul
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