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How can I determine if a certain polygon falls within another separate polygon using QGIS?

  • Welcome to GIS SE! As a new user be sure to take the Tour to learn about our focussed Q&A format. Please decide which of the GIS products mentioned you want to ask about. By asking about more than one you are effectively asking multiple questions which goes against the Tour. You should then describe not just what you want to do, but precisely what you have tried and where you are stuck trying that. – PolyGeo Oct 12 '17 at 10:08
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Another option is to use the Spatial Query tool from the Vector menu.

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Enter your source layer & reference/ intersect layer, and specify "within" as the criterion. If you want to only run the query using selected features of either layer, select these before running the query.

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If you wish, you can then use the button shown below to create a new layer from the resulting selection.

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The new layer is then added to the table of contents window. You can then right click on the layer name and "save as" if desired.

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Add your polygon layers and then go to Vector>Research Tools>Select By Location. Set your parameters accordingly and make sure to check the 'Within' box for the Geometric predicate, and run it.

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