[OSM-talk] waterways through water bodies

[Michael Heißmeier]

Hi Mike,

I would consider it similar to mapping riverbanks. The OSM wiki has a page with
some graphics on that topic: https://wiki.openstreetmap.org/wiki/Rivers
Furthermore, https://wiki.openstreetmap.org/wiki/Tag:waterway%3Driver says:

    Just as with highways, it is important that the topology of rivers is
    correct. That means, if you can go from one part of the river to an other
    part of the river via the water, there has to be a piece ofwaterway
    <https://wiki.openstreetmap.org/wiki/Key:waterway>=*between them. This
    implies that a way tagged aswaterway
    <https://wiki.openstreetmap.org/wiki/Key:waterway>=rivershould not stop on
    the riverbank of another river, but should proceed to the central way of the
    other river.

That clearly says that the waterway for the river is the important object which
must continuously be present. In all cases I have seen so far rivers were mapped
as passing through lakes without any additional tags. If someone wants to treat
that portion of a river specially then it is possible by geometrical database
queries to extract river lines within water areas.

Michael



Mike Thompson, 22.06.21 17:31:
> I was reviewing recent changes in my area, and I came upon this:
> https://www.openstreetmap.org/way/956078735
> <https://www.openstreetmap.org/way/956078735>
>
> If there is a waterbody (natural=water + water=lake or pond), and a stream or
> river (waterway=river or stream) flows into and out of that body of water,
> should the waterway be continued through the body of water?
>
> If yes, should the portion of the waterway that is inside the body of water
> have additional tagging indicating this fact?
>
> Thanks,
> Mike
>
>
>

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