[Tagging] Definition of lake/pond as applied to stream/plunge pools

[Andrew Harvey]

On Wed, 23 Dec 2020 at 23:17, Paul Allen <pla16021 at gmail.com> wrote:

> On Wed, 23 Dec 2020 at 06:21, Andrew Harvey <andrew.harvey4 at gmail.com>
> wrote:
>
>>
>> All the ones I've encountered the stream/river was only ever mapped as a
>> linear way, so it's just a linear way for the stream and then an area way
>> for the stream pool.
>>
>
> That works fine for streams.  It even works for narrow rivers.  It doesn't
> work so well for wide rivers where you map the banks with water=river.
> You can do it that way, but it seems a bit of a kluge.
>
>>
>> So for creeks would you also use river=stream_pool or have also
>> stream=stream_pool?
>>
>
> The only creek I encountered was on a wide river, so I just expanded the
> water=river into the creek.  Maybe we need a water=creek.  Except
> "creek" means different things in different parts of the world, so we'd
> spend forever arguing about the name. :)
>

A creek here is waterway=stream, so when I say creek it means an OSM stream.

Mapping streams as areas is hard, because it changes based on how much it's
rained, and needs well aligned drone imagery, not usually possible with GPS
or aerial imagery.


>
> I guess that's fine too. I see your point, it's just I'd never really
>> considered mapping streams/rivers with stream pools as anything other than
>> a linear way.
>>
>
> Consider this river.  It's wide.  And it's long (so there's a lot of
> water=river
> still to be added).  However, from sources I cannot use (copyright) I know
> there's a pool on a bend, but I don't know exactly where on the bend or
> its exact extent.  It doesn't resemble a pond with a stream flowing through
> it, it's more of a portion of river near the bank where the water flow
> rate is negligible.  It's somewhere around here:
>
> https://www.openstreetmap.org/?mlat=52.06119&mlon=-4.58477#map=17/52.06119/-4.58477
>

Oh I see it would be hard to identify a stream pool on a river because from
the imagery it's indistinguishable. All the ones I've mapped are at the
base of a waterfall, and distinguishable because it's a pool of water
compared to the linear stream way.

Here's the angling association map which includes it (and several
> other pools): https://teifitrout.co.uk/tta-waters/  It's on the Llechryd
> beat
> (which should come up as default) and it's Pwll Erylin (marked as
> point A31).  Take a look at Cenarth for a beat with lots of pools.
>
> When (if) we figure out how to handle pools, and maybe a few other
> river features, I'll approach the angling association and see if they'd
> be willing to help add such features to OSM.  Maybe one of their
> members will think about adding other things to the map when
> the weather is too bad for fishing.
>
> --
> Paul
>
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