To have a cleaner map to print I want to display only the boundary of a layer composed of more than 200,000 features (all adjacent).

Is there something more straightforward than dissolving or merging all the polygons?

I'm using QGIS.


In QGIS use the dissolve function from menu: Vector > Geoprocessing Tools > Dissolve... This will get you a new table with only the outer perimeter geometry.

  • Thanks. I was avoiding this option because it takes 1 day processing, lots of polygons with a 100 attributes. For the dissolve field I had to take an attribute with the same value for all features. – FabianUx Jun 22 '15 at 23:08
  • Well, it takes a few minutes in ArcGIS without attribute selection (the resulting shapefile losses some properties but it is ok for visualization purposes). QGIS with dissolve_all algorithm is not working so far. – FabianUx Jul 2 '15 at 18:40

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