On Fri, Aug 20, 2010 at 11:23:43AM +1000, Steve Bennett wrote: > On Fri, Aug 20, 2010 at 10:51 AM, Richard Weait <[email protected]> wrote: > > OSM expects a 'way' to be either a line, or a simple, closed polygon. > > Self-crossings, bifurcations and self-intersections other than a > > simple closed polygon are errors. > > Interesting, I didn't know that. Potlatch behaves badly when dealing > with self-intersections (ie, a P shape) but I didn't realise that it > wasn't supported in OSM in general.
Not all self‐intersecting ways are bad. Take roundabouts for instance. I have probably mapped P shapes before, too, and not worried about the way intersecting itself. Why exactly are self‐intersecting ways so bad as they are made out to be? Simon -- A complex system that works is invariably found to have evolved from a simple system that works.—John Gall
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