On 30/08/2010 22:19, Russell Harrison wrote:
I see your point about road center lines. What about river center
lines?  I was under the impression that many administrative boundaries
do correspond exactly.

Hi Russell

These wiki pages may help clarify:

http://wiki.openstreetmap.org/wiki/River

http://wiki.openstreetmap.org/wiki/Tag:waterway%3Driverbank

If the river is just a centre line i would attach the boundary to it. Some renderers (such as mapnik) make use of the width=* tag to give width to a line.

If the riverbank is drawn, there should still be a centre line to indicate the flow direction, so you can still attach the boundary to it.

Hope that helps

Dave F.

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