On Wednesday 09 September 2015, David Marchal wrote: > > As I don't know where the intake from the first stream is, I think I > can't map it this way. Besides, wouldn't that make the link > exclusive, i.e. tell that the water only comes from one point and > exits at another? If so, I can't either, as no-one can be sure of > that in karstic systems: you can be sure that a ponor feeds a spring, > but not that only this single ponor feeds only this particular > spring, as there can be other ponors feeding this spring, and other > springs fed by this ponor.
Which is why mapping this is not really within the scope of OSM - natural underground waterflows are inherently non-verifiable. You can and should map the surface phenomena related to the underground water flow of course - ponors, dolines, karst springs and other stuff. -- Christoph Hormann http://www.imagico.de/ _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
