[postgis-users] Intersection errors

[Paul Ramsey]

Just because you can scanline fill a geometry does not make it valid :) 
Check my previous email. You have all the information in AV3, you just 
need to write it out correctly and everything will be pluperfect.

P

Sean M. Montague wrote:

> I take it back.  It does work.  When I export to SVG, I set
> fill-rule="evenodd", and the hole appears.
> 
> -----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 11:46 AM
> To: PostGIS Users Discussion
> Subject: RE: [postgis-users] Intersection errors
> 
> 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
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