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Figure : urban-population-density-north-america
Urban Population Density of North America
This figure appears in the Our Changing Planet: The Fiscal Year 2003 U.S. Global Change Research Program report.
Based upon satellite measurements of city lights, this image is a map of the urban population density of North America. Red, yellow, and green are urban areas, and blue is the urban periphery. The city light data is laid over elevation data (black is sea level, light gray is over 10,000 feet). Most major cities are in level areas along an ocean, bay, large lake, or navigable river. Credit: NASA Goddard Space Flight Center; Flashback Imaging Corporation, Ontario, Canada.
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