Hi Martin,
Both polygons are invalid. The first is degenerate (a point, which obviously self-intersects. The second has a non-closed ring.
Yeah, Carl pointed that out a bit earlier. I get those issues because I'm doing something like this:
select astext(geomunion(envelope(GeomFromText('POINT(-104 40)')),
envelope(GeomFromText('POINT(-105 40)'))))
Should envelope be returning me an invalid geometry?
Charlie
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