Yes, JTS has the problem too. Sigh.... I'll have to dig into it to
find out why this is failing. I made some improvements to the
orientation test recently which I thought would make it fully robust,
but perhaps there's still issues. Or else something else is going on....
On 9/12/2012 3:14 AM, GEOS wrote:
#588: valid polygon when cw, not valid when ccw
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Reporter: olivier80 | Owner: geos-devel@…
Type: defect | Status: new
Priority: major | Milestone: 3.3.6
Component: Default | Version: 3.3.5
Severity: Unassigned | Keywords:
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Comment(by strk):
The polygon ring has 7 points, but it's a 4 sides polygon. So 2 vertices
are very close to other vertices.
I'd love to have a function (in postgis) to analyze these cases and answer
questions like: what's the minimum distance between two consecutive
vertices ? what's the minimum distance between any two vertices ?
Simplifying the geometry with a tolerance of 1e-10 is enough to fix the
invalidity, but anyway the robustness problem exists. I didn't try with
JTS but I suspect it may be an issue there as well.
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