QGIS - Adding data from a raster into existing different sized polygons

Question

I have a raster layer with 100x100 pixel size that contains expected soil subsidence (calculated) and a polygon layer with smaller polygons that contains the measured data. I want to add the calculated data from my raster to each of the road segment polygons. As you can see in the image the polygons don't neatly fall into the raster pixels.

Ideally i would like the raster value that gets added to each polygon to be an average calculated over how much of the polygon area falls into each raster pixel.

Answer 1

You should be able to achieve this using the Raster Statistics for Polygons Tool. Found under SAGA > Features - Features-Raster Tools.

Your calculated grid layer will be selected under Grids and your measured polygon layer will be selected for Polygons. For Method I think you will want to select [3] polygon wise (cell area weighted).

This tool will generate a new polygon file which contains your selected statistics. Make sure you tick Mean, along with any other statistics you may be interested in.

Answer 2

I ended up using the regular "Zonal Statistics" algorithm. Turns out i made a mistake in the coordinate reference system which is why it didn't work at first.