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

J.J.Iglesias jjiglesiasg en gmail.com
Sab Feb 24 02:55:28 UTC 2018


Aqui tenemos varios casos en los Rios que pasan por las lagunas cerca de los 
nevados de La Paz y otros mas...


----- Original Message ----- 
From: "Marco Antonio" <marcoantoniofrias en gmail.com>
To: "OSM Bolivia" <talk-bo en openstreetmap.org>
Sent: Friday, February 23, 2018 10:03 PM
Subject: [Talk-bo] Fwd: [OSM-talk] Mapping rivers that flow 
into/throughlakes?


>
>
>
> 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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