Urbanization Map of the US (IMAGE) U.S. National Science Foundation Caption This is an urbanization map of the U.S., derived from city lights data. Legened: urban = red, peri-urban = yellow. Credit NASA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.