[Qgis-user] Joining polygons

[Joris Hintjens]

Hello, 
I have a shapefile with polygons that I want to join if they touch. They have no useful property to group them. How can I do that?

My goal: group parcels within house blocks to 1 polygon. So that my layer of parcels becomes a layer of house blocks.
see a sample at
https://dl.dropboxusercontent.com/u/23700421/Schermafbeelding%202016-11-29%20om%2012.07.16.png <https://dl.dropboxusercontent.com/u/23700421/Schermafbeelding%202016-11-29%20om%2012.07.16.png>

Joris
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