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I have previously asked question here but it was closed because I did not react fast enough I think. NEvertheless, my problem is still the same: I have a set of points (meteorological stations) with 5km buffers around them. Additionally, I have a set of polygons (municipalities) in which those stations are located. Each station buffer can be over 1,2,3... polygons and those can be completly different polygons.

I would like to have data on how much of the buffer is filled by each polygon but I was not able to find a function or a way to do it. So for example for point A I would have that in the buffer of 5km there is 80% of polygon B and 20% of polygon C as the output, so 4 values, two for IDs of the polygons and 2 for the percentage overlap (it could be only 2 values for other buffer or 6 etc. etc.).

Main difference to the other similar question provided is that I have 2 vector layers (Buffer with 500 buffers and Municipalities a shape file with 500 different polygons). Previous questions were analyzing this question in situations in which I know precisely the polygons and buffers analyzed, at least that is how I understood them, so after trying to use those approaches on my dataset I was not able to replicate them.

voorten
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    You other question was closed as a duplicate. This means that it has been asked before and has an answer somewhere else, namely here. – StefanBrand_EOX Apr 16 '20 at 08:17
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    You have followed the duplicate link and what happens when you try the workflow? Make some kind of effort of your own – BERA Apr 16 '20 at 08:17
  • Get the total area of your buffer, then use intersect to get the overlapping areas between buffer and polygons, then get the area of each polygon inside each buffer, then calculate the percentage. – Erik Apr 16 '20 at 08:17
  • Does this answer your question? Counting area percentage of overlapping polygons – imre Apr 17 '20 at 09:32
  • It does not anwser my question as in my example I have a shapefile with 500 polygons and 13000 buffers. The workflows described in the previous steps do not work when I do not have a simple 1 buffer 2 polygons that I know. In my case I do not know what polygons of the shapefile are going to intersect what buffers, or even if the buffer is going to be intersected by 1,2 or more polygons. – voorten Apr 17 '20 at 09:45
  • I have also commented on the approaches posted in the previous question but did not get any response to those sadly. Bottom line being I understand those approaches and was able to replicate them in a simple setting but when I do not have specific buffers/polygons I do not know how to execute them.

    Another way of approaching this problem was to use join attributes by location -one-to-many and then getting averages of the duplicate results, only problem is that then I take average of polygons instead of their weights corresponding to % of intersection with the buffer.

     – voorten Apr 17 '20 at 09:47

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