I like this simple work, done some time ago — population dansity by Latitude and Longitude.
More often, density is shown by colour intensity and more often it is done country by country, First time I see different approach to the data. Clear that human population is concentrated around Eequator, question — what i am doing here than, in Moscow?
And surprisingly found that both Americas has relatively low population.
Idea! It could be interesting to cross the first and the second image…