[geos-devel] [GEOS] #840: PointOnSurface strange behavior

GEOS geos-trac at osgeo.org
Tue Aug 29 01:33:32 PDT 2017

#840: PointOnSurface strange behavior
 Reporter:  sbe         |      Owner:  geos-devel@…
     Type:  defect      |     Status:  new
 Priority:  minor       |  Milestone:  3.6.3
Component:  Default     |    Version:  3.6.2
 Severity:  Unassigned  |   Keywords:  pointOnSurface
 Hi all,

 Using Postgis's ST_PointOnSurface, i've got some weird results in recent
 version of Postgis (> 2.0).

 See that image :

 I would like to know how the PointOnSurface is calculated, and why there
 are so much differences between polygon A,B and C.

 With Postgis 1.5 it was working fine (i.e. the PointOnSurface for my
 polygons were at almost the same place than the Centroids)

 Thank you.

 Sylvain b.

Ticket URL: <https://trac.osgeo.org/geos/ticket/840>
GEOS <http://trac.osgeo.org/geos>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS).

More information about the geos-devel mailing list