[OSM-talk] open question about boundaries sharing nodes with ways or nodes

[Mike Thompson]

On Wed, Oct 14, 2015 at 3:43 AM, Colin Smale <colin.smale at xs4all.nl> wrote:

>
>
>
> A boundary couldn't be "the river" as a river has non-zero width. It might
> be the "centre line", "deepest line", "fastest flowing bit" ..... but it
> cannot be "the river" without further qualification.
>
Sometimes when a river legally forms a boundary it is the thalweg (deepest
part) that is referenced.

Sometimes, such as in the case of the boundary between the US states of
Ohio and Kentucky, it is the low water mark on one bank[1] (in this case
the court held that it was the low water mark of the north bank of the Ohio
River in 1792, not the present low water mark of the north bank, and
therefore the boundary and the river should not share geometry in this
case).

Mike

[1] https://supreme.justia.com/cases/federal/us/444/335/case.html
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