[postgis-users] st_centroid Points not on Polygon

[Paragon Corporation]

Stan,
I think the answer is no.  For example if you have a polygon with holes, the
centroid may very well lie in the hole.
 
Leo

  _____  

From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
Sufficool, Stanley
Sent: Friday, May 01, 2009 4:53 PM
To: PostGIS Users Discussion
Subject: [postgis-users] st_centroid Points not on Polygon


I'm sure I ran across this in the forums a year ago, but:
 
Is the st_centroid function guaranteed to return a point that lies on the
polygon? I have instances when my display doe not place it on the polygon
when using st_centroid(st_intersection(the_geom, <WKT BBOX>));
 
Thanks in advance.
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