Hi Bill According to MapXTreme 2004 objets model who is supposed to follow OGC feature geometry specification as much as possible...
Polygons contains rings - Exactly one exterior boundary ring - 0 or more interior boundary rings (hole) MultiPolygons contains polygons -----Original Message----- From: Bill Thoen [mailto:[EMAIL PROTECTED] Sent: December 6, 2004 4:12 PM To: MapInfo-L Subject: MI-L OT OGC Simple Features Geometries Does anyone know what the differences are between the OGC Simple Feature Geometry definitions for "POLYGON" vs. "MULTIPOLYGON?" (Other than the extra parentheses?) My guess is that a "POLYGON" has an outside border and zero or more interior "cut outs" (i.e. lakes), but if you have two non-overlapping polygons treated as a single object then it has to be a "MULTIPOLYGON." Also if you have an outside polygon with a "lake" in it, and an "island" in the lake and treat them as a single object (as a MapInfo region is) then that is also a MULTIPOLYGON rather than a POLYGON. But since I'm translating MapInfo objects to an OGC format, should I not split hairs and just treat all region objects as multipolygons? - Bill Thoen --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 14382 --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 14383
