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I have two polygons that consist of two separate polygons/lines in QGIS). How can I make this into a multipart polygon, which consists of 1 line in QGIS?

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Select your features.

  1. From Advanced Editing Toolbar, Click Merge Selected Features icon. enter image description here
  2. A dialog would pop up. Now select the record that you want to accept as the common record for your selected features. Click OK.
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Vector->Geometry Tools->Single parts to Multipart

However, you say that you only want a multipart polygon consisting of a single line. You are unlikely to get that ever because that would be a single polygon, because, by definition, any multipart geometry has multiple parts.

You could also dissolve your data and that will create a multipart if you dissolve polygons which do not intersect but will also combine polygons which do intersect into single units and perhaps this is what you meant (Vector->Geoprocessing Tools->Dissolve)

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what I mean by "1 line" is the attributes table. because I have 2 polygones on the same level it consists of two lines with data. so if I make them a multipart the attributes table would make one line with data right? – Michelle Hennekes Feb 21 '13 at 15:34
I tried what you said, it's not working. is that because both lines are in the same shape?... – Michelle Hennekes Feb 21 '13 at 15:36
By 'both lines' I assume you mean two separate attribute table records? If so could you refer to them as either 'records' or 'features' to avoid confusion with a line (as in geometry)? When you say it is not working can you be more explicit. Did you get an error? Did you try and dissolve or go single part to multipart? – MappaGnosis Feb 21 '13 at 15:48
indeed, I mean records or features, sorry for the confusion. This is the first time I'm working with Qgis. Qgis asks for a buffer, but I don't know what to do there... – Michelle Hennekes Mar 4 '13 at 15:12

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