Having a river run into a stream seems strange (unless something (like a drain or evaporation) reduce the amount of water in the river), or the river is split into several streams.
I'm repeating some of my arguments from the import list, hopefully to get some discussion on how to use these tags from the tagging list: I have considered that the main difference between a waterway=river and a waterway=stream is the scale/size of the waterway, i.e. a river is more massive than a stream. A local classification/name may often reflect this difference. In order to determine the size of a waterway also other aspects than the width could be considered (like e.g. depth, length, average discharge (volume rate of water flow), size of the drainage basin, how easy it is to cross (which would depend on discharge and width) or relative size compared to other streams in an area (which then of course might depend on any of the other aspects)). Currently I am using local classification/name and my best judgement on how easy it is to cross at foot to distinguish between a river and a stream. How easy it is to cross is of course subjective (and might differ during the year), but this information offers a clue to whether a waterway has been considered as a potential blocking feature or not. E.g. a short waterway that is 5 m wide, but 5 cm deep and is slow streaming I probably would tag as a stream (it is easy to cross). However a waterway that is 2 m wide, but is roaring it's way I probably would tag as a river (it's difficult/dangerous to cross). The width of a waterway could be tagged using the width or est_width tags. Using "if an able person can jump it" as the rule has some issues. How far does an able person jump? The current WR is 8.95 m. Also this seems a bit like tagging for the renderer. And lastly, the width of a natural waterway may not be that easy to verify because it might change considerably on a very short distance (from 1 to 5 m width on a 10 m run is without doubt not unusual). So at which point should it be measured/verified? -- View this message in context: http://gis.19327.n5.nabble.com/Re-Imports-NUUG-kart-kartverket-imports-to-OpenStreetMap-tp5782126p5782191.html Sent from the Tagging mailing list archive at Nabble.com. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
