[OSM-talk] Mapping rivers that flow into/through lakes?

Matej Lieskovský lieskovsky.matej at gmail.com
Fri Feb 23 14:54:39 UTC 2018

I'd like to reiterate that (much like riverbanks) the shoreline of a lake
can change far faster than the river channel. While the area maps the
"usual" extent (ignoring droughts and floods), the line is a very useful

Not connecting rivers into a network invalidates the idea of a network in
the first place and will lead to loss of data usefulness. This might lead
to wide rivers no longer getting a centerline (bacause what's the point if
everyone must work with the areas?) and will set a precedent that might get
used by (for example) highway:area proponents to do the same to the road
network. (No offence to the proponents of highway:area intended.) I'm
almost curious as to what mayhem would replacing roads with areas cause.

Should we not go the opposite direction and make sure that all rivers are
either tributaries, or flow into an ocean or a lake that would get tagged
with "no outflow"? I wouldn't be surprised to find out that someone already
does that.

On 23 February 2018 at 15:50, François Lacombe <fl.infosreseaux at gmail.com>

> 2018-02-23 15:36 GMT+01:00 Rory McCann <rory at technomancy.org>:
>> If OSM takes a "all rivers must be connected through lakes", then data
>> consumers have a simple job. If OSM says "some will and some won't", then
>> data consumers have to process the data to add intra-lake connections. If
>> they have to do it some of the time, why bother connecting *any* rivers?
> IMHO rivers should always connect through lakes. I'm always mapping like
> this, no exception.
>> I think I'll change to not connecting rivers, unless it's very obvious,
>> and leaving data consumers to connect rivers themselves.
> This may be a very hard task, especially if rivers don't share nodes witk
> lakes waterbody.
> François
> _______________________________________________
> talk mailing list
> talk at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk/attachments/20180223/0ecbcd7a/attachment.html>

More information about the talk mailing list