Subject: Re: Three-dimensional boundaries
Date: Jun 30, 2003 @ 17:21
Author: acroorca2002 ("acroorca2002" <orc@...>)
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> Normally, boundaries are only two-dimensional, and as far as Iknow
> everything straight below and above the surface belongs to the"down"
> country that IS that surface. I don't know of any lower or upper
> limitations of national soil (centre of the earth??) or airspace
> (outermost atmosphere??), but I think the boundaries "up" and
> are at right-angles with those on the surface of the earth (ofcourse
> not when the boundary is on a slope, but I think you know whatI
> mean). But in a book I recently bought on a second-hand bookmarket,
> I found this item about the benl boundary in the river Meuse:at
>
> "The sovereignty of both riverine states extends to the thalweg;
> bridges, however, the boundary is in the middle of the centralarch
> of the bridge, a point which doesn't coincide with the thalwegbelow.
> An invisible line from the thalweg below the bridge to the pointin
> the middle of the central arch of the bridge is the imaginarythalweg
> boundary line. This imaginary line practically never is at right-
> angles with the water of the Meuse. This can only be if the
> is right in the middle, which practically never is the case. Theangle
> imaginary three-dimensional line is at a constantly shifting
> with both river and bridge, as the thalweg is constantlyshifting."
> (from "De grens gemarkeerd, Grenspalen en grenskantorenaan de
> landzijde", by Paul Spapens and Kees van Kemenade, Hapert,1992, page
> 34)surface?
>
> Are there any other examples of oblique (vis-a-vis the vertical)
> boundary lines? Perhaps also below the (ground or water)
>
> Any ideas, anyone?
>
> Peter S.