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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