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I would like to "Add Rings" but using other polygons. Example: https://www.dropbox.com/s/ue1k3b646ivqedo/holes.JPG

I would like to delete the two selected polygons and create holes under them in the big polygon where they are.

Is that possible?

Thanks!

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1 Answer 1

up vote 2 down vote accepted

you can save the "hole" polygons and the "base" polygons in two different, temporary shapefiles and then you use the symmetrical difference tool. You find it in vector>geoprocessing tools (if you are using a very old qgis version it is in the fTools plug-in). This create the shapefile that you are looking for. If you have already 2 shapefiles (bases and "hole"), just run the tool ;).

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great that works! thanks!! –  Egidi Sep 26 '12 at 8:30
    
For temporary shapefiles, use Memory Layer Plugin –  Willy Sep 26 '12 at 11:53
    
@Aitor good! (it will also be nice if you mark my answer as useful ;) ) –  seba Sep 27 '12 at 12:10
    
@seba i cant since i dont reach 15 of reputation when i reach ill do it. thanks again for your help –  Egidi Jan 31 '13 at 11:24

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