I want to select the red circled centroids. These centroids must be within the blue buffer.

Centroid I want to select.

  • Seems like you meant to include an image in your question. – csk Mar 28 '18 at 17:00
  • Image added, made a mistake. :) – Mensur Pelinković Mar 28 '18 at 17:05

You can use the Select by location tool. Go to the Vector menu, then Research / Select by location. The first layer is the point layer, the second one is the polygon.

enter image description here

  • This is a good suggestion as well, and probably the easier route to go if you're using QGIS 3.0. I believe the Spatial Query tool has been removed in that release. Makes sense-- Spatial Query and Select by Location are pretty much identical. – lambertj Mar 28 '18 at 18:20

You can use the Spatial Query tool under the Vector menu to select the centroids that fall within your buffer polygons. Select the centroids as the Source Features, the buffer layer as the Reference Feature, and use the dropdown to select "within" for the selection type.

enter image description here

  • The Spatial Query tool must first be activated from the plugin menu. – csk Mar 28 '18 at 17:56
  • Certainly worth checking if you don't see the option. But I don't think I've ever had an install that didn't have it activated by default. – lambertj Mar 28 '18 at 17:59

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