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In my previous question I've asked how to can I merge different polygons while converting to GeoJSON and TopoJSON.

After a day of researching I've realized that, rather trying to do it command line, I should use some editor which can handle Shapefile data. So, I've choose QGIS.

I've toggled to edit mode, chose all areas needed and called "merge selected features". After the merge I'm getting something like this: enter image description here

I'm expecting to get all countries in Africa joined into one region. But, as you can see, I'm getting some dangling paths. My question is - what I'm doing wrong, how I can avoid such dangling paths or get rid of them after the merge? Since selecting all this nodes via "Node tool" does not help much.

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I'm not very familiar with QGIS but you can do what you need to do with ThinkGeo's GIS Editor program which has a free trial.

There are a couple different ways to accomplish your task but what I found to be the easiest is to load your shapefile, go to the Edit tab, Select your layer as the one to edit and then select all the features you want to join together. You can do this by using the Select tool and clicking and dragging to select many countries if not all the countries in Africa. Once they are selected hit the Union button on the tool bar under the shape operations section and all of the features will be joined together without dangling paths.

This will union all the features together and you can modify the attribute data if you like. If you didn't get all the countries selected on the first try just go ahead and save your edits and repeat the process until you have all the countries you want in your region.

Let me know if this works for you.


enter image description here

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Thank's, at least now I know there is a bug in QGIS (at least in MacOS version) –  shabunc Sep 11 '13 at 5:13
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