On 2018-02-22 22:59, Rory McCann wrote:
Hi mappers,
What's the best way to map rivers that flow into lakes, especially when
another river flows through it? Should they be connected?
When a river flows through a lake, you can map a waterway=river way
through it, to be "topoligcally complete". Or would it be better to add
ways (w/o waterway tag) to the river relation?
When a tributary river joins another, join the central waterway=river
ways together. But what if a river drains into a lake with a "central
river" through it? Should you connect that river to the central river?
It makes topological sense.
If you asked someone "Where does this river end?" they'd probably point
to where it joins the lake. Connecting the river to the "central river"
breaks this. And it can result in odd long ways. I might have gone a
little OTT here (
http://tools.geofabrik.de/osmi/?view=water&lon=27.98062&lat=-16.95179&zoom=11
) or here (
http://tools.geofabrik.de/osmi/?view=water&lon=-8.26705&lat=52.99047&zoom=11
).
I see nothing wrong with those examples, I would do it the same,
especially if the rivers can be sailed on by boat. Then you absolutely
need the rivers to be connected to a central river (or fairway) in the
lake.
Maarten
_______________________________________________
talk mailing list
talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/talk
