I also had troubles with Union tool in QGIS. Then I decided to use GRASS plugin and it worked fine. v.overlay (OR option) is analogous to the Union tool in QGIS or ArcGIS.
I'd recommend you to take a look into vector overlay tools in GRASS. GRASS alone is a complete GIS/RS tool, well documented and fairly stable. Regards ------------------------------------------------------------------------ Ivan Santiago Especialista en Sistemas de Información Geográfica Área de Tecnologías de Información Oficina de Gerencia y Presupuesto Tel.:(787) 725 9420 x 2378 Email: [email protected] Web: http://www.ogp.pr.gov ------------------------------------------------------------------------ [http://www.ogp.pr.gov/logos.png] NOTA DE CONFIDENCIALIDAD: Esta transmisión electrónica contiene información perteneciente a la Oficina de Gerencia y Presupuesto, que es confidencial, privilegiada y/o privada bajo las leyes aplicables. Se utiliza solamente para el uso de la persona o entidad que se dirige. Si usted no es el destinatario intencional, se le notifica que se prohíbe cualquier uso, diseminación o copia de esta comunicación. Si usted recibe esta comunicación por error, favor de notificar al remitente y eliminar este correo electrónico de su sistema. CONFIDENTIALITY NOTE: This electronic transmission contains information belonging to the Office of Management and Budget, which is confidential, privileged and exempt from disclosure under applicable law. It is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are hereby notified that any use, dissemination, or copying of the communication is strictly prohibited. If you have received this communication by error, please notify the sender and delete this e-mail from your system. _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
