With apologies: a choropleth map, not a heatmap. And the granularity is unfortunately quite too low, but I appreciate that sometimes your geodataset is limiting. But with that pedantry out of the way: it would be awesome to be able to normalize based on cost of living.
Not that it’s an excuse: I do find it kind of odd that I do the same job as another remote engineer and yet I’m paid a fraction? But to be fair I don’t have student loans and paid off my house in a few years, so cost of living, cost of education, etc. can reveal practical opportunity even if it enshrouds any definition of fairness.