2013/10/16 Christoph Hormann <chris_horm...@gmx.de> > > I've noticed that somebody recently added a rule to distinguish > > waterway=river from waterway=stream on the wiki page for stream, but > > I'm not sure how/where that rule (which is related to how far an able > > person can jump) became commonly accepted? > > I added this to that wiki page but it has been around for a long time > (on http://wiki.openstreetmap.org/wiki/Key:waterway since 2007). >
Yes, the "rule of thumb" if you can jump over it, it is a stream, is there for a long time. On the other hand this depends how long you can jump (I guess it is safe to asume that a young person with average abilities can jump 3-4 meters, the world record is like 8 something). IMHO our river classification is rather poor at the moment, we have only 2 classes: river and stream but 3 classes for artificial waterways (ditch, drain and canal). My own mapping for rivers uses this rule: where I map there is an official setting what is considered a river (based on different, non-uniform/consistent rules and also on historic reasons), and everything else (if natural) is a stream, regardless whether I could jump over it or not. cheers, Martin
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