[postgis-users] Intersection errors

[Sean M. Montague]

I just tested it, it does not work.  Very interesting.  This explains a
lot.  Is there not a way to cut holes in polygons?

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Sean
M. Montague
Sent: Tuesday, June 07, 2005 11:41 AM
To: PostGIS Users Discussion
Subject: RE: [postgis-users] Intersection errors

It's a hole.  It should be valid...I think.  What about islands in a
lake?  The only time I have a problem with them is when I intersect one.

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Paul
Ramsey
Sent: Tuesday, June 07, 2005 11:35 AM
To: PostGIS Users Discussion
Subject: Re: [postgis-users] Intersection errors

It's not valid, because legal multipolygons do not have parts that 
interact. Your multipolygon has two parts and one is completely 
contained in the other. No cookie for you!

Paul