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I am new to GIS and using QGIS with LandScan 2019 population dataset (https://landscan.ornl.gov/landscan-datasets) to extract population data for a specific country. After I extract it, I get the following files:

LandScan 2018 Citation.ris
lspop2018.html
lspop2018.lyr
info--------|
            arc.dir
            arc0000.dat
            arc0000.nit
            arc0001.dat
            arc0001.nit
            arc0002.dat
            arc0002.nit
            arc0002r.rar
lspop2018---|
            dblbnd.adf
            hdr.adf
            metadata.xml
            prj.adf
            sta.adf
            vat.adf
            w001001.adf
            w001001x.adf

In QGIS > Add Layer > Add raster Layer > select "File" > browse to "w001001.adf"(the largest size file) > Add > Close.

I get this:

enter image description here

I need to extract population of Azerbaijan and the coordinates of the associated polygons, so the final file I need would look something like this:

 POLYGON      POPULATION
 POLYGON(12..  23000
 POLYGON(12..  234
 ...

How do I proceed?

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