"Their data divides the world into about 30 million tiny boxes, each one roughly 3 miles by 3 miles in size," Galka explains in an email to WorldViews. "For each box, the data provides estimate for the number of people living inside it."
The yellow region in the map reflects every cell that has a population of 8,000 or more people; the black reflects those with fewer than 8,000 people.
Zooming in reveals a starker glimpse of the population density of certain areas. See, for example, how stretches of South Asia's Gangetic plain and eastern China contain vast multitudes compared to the rest of the planet.
Compare that to the relative emptiness of the United States or even much of the continent of Africa, where aside from a few major urban centers near the coast, and the Nile delta, population density remains rather low.
"As it relates to overpopulation, the U.N. projects that by 2100 the world population will reach 11 billion, with nearly all of that growth occurring in Africa," writes Galka in his email to WorldViews. "So, the question is, can Africa accommodate an additional 4 billion people?"