On Sat, 2013-10-19 at 22:13 +0200, Christoph Hormann wrote: > On Saturday 19 October 2013, Jonathan wrote: > > > > It seems a river is something that has a source and a mouth (either > > where it joins the sea, lake or a larger river). So I would say that > > only streams that have been named "River ...." or "The River ..." > > should ever be tagged as a river, everything else is a stream. > > Be careful here - different languages use different distinctions and > even in English use of the terms might differ by country or region. > And of course duplicating information that is already in the name tag > is not necessary.
Just in the UK I can think of Brook, Clough and Beck. And thats just the Midlands and some of the North of England. > > > One option might be to tag every natural watercourse water=stream and > > strahler=[1...12] and then let the renderer choose how to display it > > based on the strahler order? > > No, first of all this kind of topological measure is not possible to > determine locally by the mapper since it depends on the whole river > system upstream from the point in question (and even more: it requires > complete data of it). Second it is not suited for use in map rendering > from a cartographic viewpoint. > > I explained the requirements for an importance rating for rendering of > rivers in: > > http://www.imagico.de/map/water_generalize_en.php > > The only really important thing for allowing good rendering of the > waterways is to have correct orientation and connectivity of all ways - > which is a huge problem in the OSM data, in my opinion one of the most > severe we have (together with the notoriously broken boundary relations > maybe). > +1 Phil (trigpoint) _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging