I have a problem with the function buffers in QGIS. I prepared a layer with bus stops and buffers for them (500 m). Then I joined layer with buffers and layer with density of population. I want to know the number of inhabitants living within 500 m from the bus stop. That's why I use join attributes by location. Everything came out well, but the problem is the overlapping buffers. "Connected people" are in two or three buffers at once. And I need to know the number of inhabitants outside of these buffers. Is there any possibility of division between buffers or converted, so as not counted them a few at a time?

Orange and brown spots are inhabitants.

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    Union all the buffer areas into one geometry. – user30184 Mar 7 '16 at 10:10
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    Is your layer with density of population a point layer? – Joseph Mar 7 '16 at 11:24
  • Thanks, of course it was very easy, but I not even thought about that :) – KarolinaC Mar 7 '16 at 11:45

If you tick the dissolve results option when you run the buffer you won't have issues with overlapping zones and double counting.

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