Satellites and Measles-Niger lights

Satellites and Measles-Niger lights

Population of Niger cities based on night light

On this image of Niger, size and brightness of the glow of cities at night, photographed by orbiting satellites, has been converted into colored spikes indicating the approximate human population of those sites. Niger's capital, Niamey, is represented by the tall spike at left. Seasonal changes in the size of the spike indicate movement of thousands of people into or out of the city. The blue-gray shape across the top of the image is the Mediterranean Sea.

IMAGE: Andrew Tatem