I wasn't able to find something online that fit my needs, but I'm inexperienced with ArcMap and I thought someone here might be able to help.
I have this map of light pollution over a country, and within each county I want to add up the values of each pixel in a raster layer. The idea being to see how much of each colour is present in each county, and therefore how much light pollution is present.
It looks like this currently:
I have the spatial analyst toolbox, which I assumed is required. How best should I go about this analysis?