#665: st_isvalid fails to detect invalid interior ring orientation
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Reporter: vmo | Owner: geos-devel@…
Type: defect | Status: new
Priority: major | Milestone: 3.4.3
Component: Default | Version: 3.3.3
Severity: Unassigned | Keywords:
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The following request should return False (the interior ring as the same
orientation as the exterior ring)
select st_isvalid(st_geomfromtext('polygon((0 0, 1 0, 1 1, 0 1, 0 0),(.1
.1, .9 .1, .9 .9, .1 .9, .1 .1))'));
But it returns True.
From Simple Feature Access - Part 1 (1.2.1), section 6.1.11:
The exterior boundary LinearRing defines the “top” of the surface which is
the side of the surface from which the
exterior boundary appears to traverse the boundary in a counter clockwise
direction. '''The interior LinearRings will have the opposite orientation,
and appear as clockwise when viewed from the “top”,'''
--
Ticket URL: <http://trac.osgeo.org/geos/ticket/665>
GEOS <http://geos.refractions.net/>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite
(JTS).
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