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I have used the Topology Checker plugin in QGIS to create rules to identify errors in my layer. For example, I have used it to search for all overlapping polygons. This plugin is great for finding such errors, but how can I select them in my original layer. I have a very large data set and doing them by hand is not an option.

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Unfortunately I don't think it's possible. Your best bet is to probably use the v.clean tool from GRASS to automate the fixing of errors. There's a number of cleaning functions available within the v.clean tool such as:

  • Break: Breaks lines at each intersection
  • snap: Snaps lines to vertex in threshold
  • rmdangle: Removes dangles
  • rmline: Removes all lines or boundaries of zero length, threshold is ignored
  • rmsa: Removes small angles between lines at nodes
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