I need to export a WMS Map in a raster (QGIS) as I would like to do a zonal statistic after I need the WMS raster values. I can see them in the Identify results panel. The WMS has single Band color data but after exporting it, it has 4 bands with only the colour values, not the feature values. (see picture) Is there a possibility in exporting the WMS to a raster and keeping the values? I always tried it with a tiff. Is another format better? Does anyone know how to export only one band? this might help already.
The WMS map Bullerkartan 2012, alla källor: (contextualWMSLegend=0&crs=EPSG:4326&dpiMode=7&featureCount=10&format=image/png&layers=mftemp:luftkvalitet-2015-no2ytor&styles&url=http://kartor.miljo.stockholm.se/geoserver/wms?layers%3Dmfraster:bullerkartan-2003-allakallor)