[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.

Cheers

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
>reasonable
>> with intermittent flows would be a great progress.
>
>What's the problem with intermittent flows? I'm not familiar with water
>
>tagging.
>
>River width is a local property - it can vary lot in different places.
>I 
>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
>(according 
>to Wikipedia):
>
>- classic stream order (also called Hack's stream order or Gravelius' 
>stream order),
>- Strahler stream order (also Strahler number or Horton–Strahler
>number),
>- 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
>be 
>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:
>
>https://wiki.openstreetmap.org/wiki/Talk:Key:waterway#Stream_Order
>
>-- 
>"Like a halo in reverse" [M. Gore]
>
>
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-- 
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