[Qgis-user] conditional dissolve

[Carson Farmer]

Good point Pedro, my suggestion wouldn't output all the required
features, only those that were initially selected... You can of course
also edit the table in QGIS if you are using a relatively recent
version, which supports adding fields and a field calculator.

Carson

On Mon, May 24, 2010 at 3:51 PM, Pedro Tarroso <ptarroso at mail.icav.up.pt> wrote:
> Hi
>
> I would create a new field in the attribute table to be filled with the
> condition. I believe the simplest way is to use a dbf editor (like
> openoffice spreadsheet or old versions of excel) to create the condition
> field (same code for shapes to be dissolved). Then I would use the Dissolve
> tool from fTools plugin on that field.
>
> Hope that it helps.
>
> Boa sorte,
> Pedro
>
> -----Original Message-----
> From: qgis-user-bounces at lists.osgeo.org on behalf of A. Marcia BARBOSA
> Sent: Mon 5/24/2010 2:30 PM
> To: qgis-user at lists.osgeo.org; grassuser
> Subject: [Qgis-user] conditional dissolve
>
> Hi,
>
> I'm using the shapefile of the GADM database of Global Administrative
> Areas (http://www.gadm.org), but the subdivisions of some countries
> (such as Spain, Slovenia and others) are too small. In order to get
> divisions that are more evenly sized among all countries, I need to
> dissolve sub-regions to regions, but only within some of the
> countries. Is there a way to use a "conditional dissolve" on only some
> selected countries?
>
> Cheers
> Márcia
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>



-- 
Carson J. Q. Farmer
ISSP Doctoral Fellow
National Centre for Geocomputation
National University of Ireland, Maynooth,
http://www.carsonfarmer.com/