[Tagging] nautical channels

[Martin Koppenhoefer]

sent from a phone

> On 30. Jun 2018, at 14:41, Volker Schmidt <voschix at gmail.com> wrote:
> 
> The reason I am asking here, is that I detected by chance that navigation channels in the Venice Lagoon [1] have been tagged as waterway=canal, which to me seems not correct, or at least not covered by the wiki definition.


I have noticed problems with this as well in a map I made in this area (1:400.000) this week, what a coincidence. 

Reading the wiki, it seems in line with the canali tagged like this (artificial ones, if there are any), because there is a merely functional distinction:


“An artificial open flow waterway used to carry useful water for transportation, waterpower, or irrigation.”

Somehow the mapnik style always conveyed a hierarchy of scale between canal, drain and ditch but there is not anything about this in the current wiki article: https://wiki.openstreetmap.org/wiki/Tag:waterway%3Dcanal

Thinking about it, the Canale Grande should maybe not get waterway=canal but waterway=river?

https://www.openstreetmap.org/way/398987317#map=14/45.4368/12.3284

Cheers,
Martin 
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