[OSM-talk] WaterwayMap.org is really going downhill

[Clifford Snow]

Thanks for reminding me about your waterway map. There are a bunch of
streams that I need to fix.

Could you help me with one issue I have? When a stream connects to a
waterway=ditch, waterway map doesn't accept that was a continuation. Where
I live, in a rural agricultural area, it is common for streams to in a
ditch. For example, see
https://waterwaymap.org/#tiles=planet-grouped-ends&map=15.19/48.514461/-122.354132
where the stream connects to a ditch, then flows into the Samish River. Can
the program accept a ditch as a continuation?

Thanks,
Clifford



On Tue, Jul 2, 2024 at 6:07 AM Amanda McCann <amanda at technomancy.org> wrote:

> [WaterwayMap.org](https://waterwaymap.org/), shows how rivers & streams
> are connected in OSM. It's proven pretty popular with mappers. It's been
> pretty undirected from the start, and I'm happy to say it's really going
> downhill now.
>
> Previously waterways were joined together purely based on topology,
> ignoring direction. River bifurcations occur more often than I thought, and
> connect large water systems together. e.g. [casiquiare canal](
> https://github.com/amandasaurus/waterwaymap.org/issues/55) or the
> [Garonne/Ebro](https://en.osm.town/deck/@amapanda/112240136848653730)
> (causing [tagging questions](
> https://community.openstreetmap.org/t/is-there-a-common-tag-for-underground-infiltrated-watercourses/111558)
> ).
>
> So, I've added a new calculation which groups ways together **based on the
> direction they flow**, and which “end point” they flow into. All rivers &
> streams which flow into the same river mouth will get coloured the same.
>
> ## [Explore the Downhill Waterway Map](
> https://waterwaymap.org/#tiles=planet-grouped-ends) _(or select “Natural
> Waterways (downhills)” from the Settings)_
>
> It's got some bugs. 🐞 (but they're cute aquatic bugs)
>
> When a river splits, the total upstream is split equally, and mapping
> mistakes can cause a lot of upstream value to stop some random field
> somewhere. All river segments upstream can be assigned to that end point,
> and appear split off from other parts of the river downstream. It's already
> been [seen](
> https://discord.com/channels/413070382636072960/413070502580453387/1257454307977203773)
> in the [Murray-Darling river system in Australia](
> https://waterwaymap.org/#map=5.64/-31.123/145.889&tiles=planet-grouped-ends&len=500..inf).
> Use the [Waterway Ends map](https://waterwaymap.org/ends) (prev. on
> [forum 💬](
> https://community.openstreetmap.org/t/the-end-of-waterway-map/108632)) to
> find where it ends. I hope that people will fix up these mapping mistakes,
> and this will happen much less. Perhaps I can improve this by looking at
> the `name` of the waterway.
>
> The [software which converts the geojson to vector tiles](
> https://github.com/felt/tippecanoe) has to drop some line segments,
> causing gaps at certain zoom levels. Could this type of map be better with
> raster tiles? 😳🙊
>
> I'll be talking about WaterwayMap.org at [SotM Europe 2024](
> https://stateofthemap.eu/) in Łódź, Poland on [Sun. 10:00am](
> https://cfp.openstreetmap.org.pl/state-of-the-map-europe-2024/talk/K8LF7U/).
> if you're around say hi. 🙂 (But first, the Alps are calling… 🥾🎒🏔️)
>
>
> # See also
>
> * [News about WaterwayMap.org](
> https://en.osm.town/@amapanda/tagged/WaterwayMapOrg) can be found on
> Mastodon/Fediverse (incl. [Atom/RSS feed](
> https://en.osm.town/@amapanda/tagged/WaterwayMapOrg.rss)):
> * This code is on Github: [`amandasaurus/waterwaymap.org`](
> https://github.com/amandasaurus/waterwaymap.org). [New issue reports](
> https://github.com/amandasaurus/waterwaymap.org/issues/new) are welcome.
> * The programme which generates it is [`osm-lump-ways`](
> https://github.com/amandasaurus/osm-lump-ways)
> * [WaterwayMap on the OSM Forum](
> https://community.openstreetmap.org/tag/waterwaymaporg)
> * [Waterway Loops](https://waterwaymap.org/loops) ([forum 💬](
> https://community.openstreetmap.org/t/the-wonders-of-early-medieval-fore-abbey-and-osm-river-topology-today-i-e-waterwaymap-org-is-going-around-in-circles/107497))
> which show probably tagging mistakes.
>
> ⓐⓜⓐⓝⓓⓐ 🌻
>
> _______________________________________________
> talk mailing list
> talk at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk
>


-- 
@osm_washington
www.snowandsnow.us
OpenStreetMap: Maps with a human touch
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