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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.

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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.

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  • 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
    Commented Jun 22, 2015 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
    Commented Jul 2, 2015 at 18:40

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