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Working with census WMS raster in QGIS

Geographic Information Systems Asked by Velester on March 7, 2021

I established a connection to the WMS service of the german census . Displayed correctly.
I’ve tried to extract values from the specific raster, e.g. population, to polygons like in the picture below.

enter image description here

I’ve tried all relevant SAGA VECTOR <-> Raster Tools as shown in the picture below.

enter image description here

All attempts conclude into an error where it says:

Grid statistics for polygons:could not initialize data object.

It implies that the tools cant evaluate the data in the raster.

How do I do this working with (german) census raster data?

I am using QGIS 3.10.4.

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