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This question already has an answer here:

I have two shapefiles.
1. the clinic buffers 500m area.
2. the postcode area.

Is there a simple way to calculate the intersect two shapefiles ?
I'm using QGIS Dufour. I tried to use fTools to intersect. However, it didn't show me actually how much every piece of the green area. It just combined the fields of two shapefiles.
Please let me know how to calculate the intersect two shapefiles.
Thank you in advance.

intersect two shapefiles

It just combined the fields of two shapefiles

I used "Field Calculator" to calculate the intersection with $area. But those numbers are bigger than original area.enter image description here

marked as duplicate by underdark Oct 31 '13 at 18:06

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  • Have you tried using the rest of the tools in the Processing Toolbox? Look in Vector -> Overlay. Clip should work. – Rob Lodge Oct 30 '13 at 16:45
  • Just to clarify: Is there an issue with the geometries in the results or are you just unhappy with the attribute table? – underdark Oct 30 '13 at 18:48
  • If you are trying to calculate the area for each of the polygons clipped by the buffer, the answer to this question might help you. – cengel Oct 30 '13 at 22:25
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    The table just show the original area of postcode, I want to calculate the intersection area of postcode. – Shubon Yu Oct 31 '13 at 6:15
  • Thanks everyone. Use "Field Calculator", it did work. But have to reopen a new file with this intersection shape. – Shubon Yu Oct 31 '13 at 10:52
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I work with gvSIG, but I think that is similar: use "Clip", not "intersect"

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