[geos-devel] isvalid info

[Martin Davis]

Or the Open GIS Consortium (OGC) Simple Features for SQL (SFS)
specification. JTS & GEOS implement the polygon model in that
specification exactly.

You could also get JUMP or JTS and try your polygons in them, to see why
they are invalid (they both include a way of validating WKT geometry and
displaying the location of failures).

Martin Davis, Senior Technical Architect
Vivid Solutions Inc.
Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046


> -----Original Message-----
> From: Martin Davis 
> Sent: May 7, 2004 8:44 AM
> To: GEOS Development List
> Subject: RE: [geos-devel] isvalid info
> 
> 
> Have a look at the JTS specs, available here:
> 
> http://www.vividsolutions.com/JTS/JTSHome.htm
> 
> Martin Davis, Senior Technical Architect
> Vivid Solutions Inc.
> Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
> Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046
> 
> 
> > -----Original Message-----
> > From: Marcel Koopman [mailto:publiek at home.nl]
> > Sent: May 7, 2004 4:44 AM
> > To: geos-devel at geos.refractions.net
> > Subject: [geos-devel] isvalid info
> > 
> > 
> > Hello,
> > 
> > I want to know when a polygon is considered valid.
> > 
> > I have 696 polygons that are not valid, but 16583 that are.
> > 
> > In mapserver i can draw all polygons.
> > These polygons are polygons on postal code level.
> > 
> > Can someone give me some info about isvalid?
> > 
> > Thanks.
> > 
> > Marcel
> > 
> > 
> > _______________________________________________
> > geos-devel mailing list
> > geos-devel at geos.refractions.net
> > http://geos.refractions.net/mailman/listinfo/geos-devel
> > 
> _______________________________________________
> geos-devel mailing list
> geos-devel at geos.refractions.net 
> http://geos.refractions.net/mailman/listinfo/geos-devel
>