On Sun, Jun 6, 2010 at 10:21 AM, Dave F. <dave...@madasafish.com> wrote:
>
> Off the top of my head I'm thinking of a line within the area that
> defines the direction. it would have to be linked to the boundary by
> using relations(?)

Yup that is how I think also. Still no complete solution, but probably
worth refining this, as a start:
http://wiki.openstreetmap.org/wiki/Relations/Proposed/Area

Note that this will still not be a perfect solution for the
semi-circular steps/terraces, because a way + area will not define the
"curve" in each step. To do this explicitly, you'd probably want to
map each step individually (as a curved way), with something like
man_made=embankment.

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