[Tagging] Rivers classification

Frank Villaro-Dixon frank at villaro-dixon.eu
Mon Aug 7 09:14:30 UTC 2017

Sadly, neither of these stream orders are correlated with the discharge of the river, which could then send a wrong impression on the rendered map if they would indicate the river width.


On 6 August 2017 17:30:20 CEST, "Daniel Koć" <daniel at xn--ko-wla.pl> wrote:
>W dniu 06.08.2017 o 13:32, Richard pisze:
>> as of rendering, respecting river width and doing something
>> with intermittent flows would be a great progress.
>What's the problem with intermittent flows? I'm not familiar with water
>River width is a local property - it can vary lot in different places.
>need simple, synthetic measure for lower zoom levels (like 
>country/continent) without making any computations.
>Stream order classification (or rather "waterway order" in our case) is
>very good for this, but it has few different versions, mainly
>to Wikipedia):
>- classic stream order (also called Hack's stream order or Gravelius' 
>stream order),
>- Strahler stream order (also Strahler number or Horton–Strahler
>- Shreve stream order (with Hodgkinson et al.)
>but also topological stream order system and probably some other too.
>We should allow any of them to be used, so a general namespace should
>crafted. It could look like:
>1. order:x
>- order:classic (or order:hack or order:gravelius),
>- order:strahler,
>- order:shreve,
>- order:topologic(al)
>2. waterway:order:x
>3. waterway_order:x (or stream_order:x or waterbody_order:x)
>4. waterway:class:x (or waterway_class:x)
>and possibly others. What do you think about it?
>> Iirc the stream order issue has been brought up on some talk page
>> previously.
>Thanks, but it's just a brief mention:
>"Like a halo in reverse" [M. Gore]
>Tagging mailing list
>Tagging at openstreetmap.org

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