Pata, an data visualization agency, made an interactive map of racial distribution in Brazil.
What you are seeing is an interactive map of racial distribution in Brazil. Through it you can see the geographic distribution, population density, and racial diversity of the Brazilian people. Each dot on the map represents one person. The location and color of the dots are based on the IBGE (Brazilian Institute of Geography and Statistics) Census 2010, available online; each color on the map represents one of race options possible in that census.
The map was created by us from Pata; the inspiration and the basis of the code used to generate the map came from Dustin Cable, a former researcher at the Cooper Center for Public Service at the University of Virginia, and author of a racial map of the United States . He, in turn, was inspired by Brandon Martin-Anderson from the MIT Media Lab, and Eric Fischer, mapmaker/programmer.
More information here.
The US racial map can be viewed on this page.