[Talk-bo] Fwd: [OSM-talk] Mapping rivers that flow into/through lakes?

Marco Antonio marcoantoniofrias en gmail.com
Sab Feb 24 02:03:43 UTC 2018




hola,

hay una interesante discusión sobre la continuidad de ríos a través/dentro de lagos o lagunas. (leer abajo y dejo enlace)

https://lists.openstreetmap.org/pipermail/talk/2018-February/080235.html

Justamente hace unos días atrás revisaba el embalse y represa misicuni y cómo quedo el rio misicuni que nace en alturas y  continua después del embalse

https://www.openstreetmap.org/way/483284540
https://www.openstreetmap.org/way/421037232

para mi, ríos deberían tener su propia red conectada y no depender su continuidad de lagunas o lagos, y  riachuelos o ríos que nutren lagunas o lagos deberían estar conectados al flujo principal

se aprecia este esquema cuando se conoce el flujo que tenia un rio (misicuni) y sus afluentes antes de ser inundado,

Marco Antonio

-------- Original Message --------
From: Rory McCann <rory en technomancy.org>
Sent: February 22, 2018 9:59:00 PM UTC
To: OSM Talk <talk en openstreetmap.org>
Subject: [OSM-talk] Mapping rivers that flow into/through lakes?

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
).

Without joining the ways, then a data consumer will have to do
complicated extra processing to deduce that one river "flows into" the
other? (River X ends on the shore of a lake, River Y flows through the
lake, so connect X to Y). Is that "good enough"?

Thoughts?

Rory



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