![]() The map shows energy infrastructure for the Fresno area distributed over a wide range of population densities. The map below, of the area around Fresno, California, combines population density by census tract with several energy infrastructure layers. Adding this demographic information illustrates how the electric grid overlays areas of varying population density. map above, high-voltage electricity transmission lines of 345 kilovolts (kV) or more overlay a thematic map where darker colors represent higher levels of population density by county. Counties, on the other hand, have a much wider population range, with populations as high as 9.8 million people, for example, in Los Angeles County. Census tracts are typically much smaller subdivisions of a county, with an average population of about 4,000 people and a general range of 1,200 to 8,000 people. Population density by census tract for the United States and Puerto Rico (people per square mile)īecause the layer showing population density by census tract provides more detailed information, that layer may be more appropriate for analysis of small areas than the population by county layer. ![]() Population density by county for the United States and Puerto Rico (people per square mile).The new layers are based on United States Census Bureau data from the 2010 Census: energy system-such as electric power plants and transmission lines, crude oil and natural gas production sites, and other key components of the energy system-interact with and relate to centers of population. The population density data will allow users to analyze how components of the U.S. Energy Mapping System and related interactive state maps now include two new layers showing population density to complement layers that already display energy infrastructure, energy resources, storm tracks, and flood hazard areas. Energy Information AdministrationĮIA’s U.S. Location, Location, Location, on the Earth Observatory.Source: U.S.One of the Distributed Active Archive Centers in NASA’s Earth Observing System Data and Information System, SEDAC provides information about human interactions in the environment. This particular population density map is based on a global population density map created at the Socioeconomic Data and Applications Center (SEDAC) at Columbia University. In the comparison, trends that track the human footprint can emerge. How does population density relate to changes in land cover? How are natural resources distributed in relation to population? How do densely populated regions, with their pollution, artificial surfaces, and urban heat islands, affect climate? To answer these and other questions, scientists compare detailed population maps to other geographically based data sets, including satellite data. ![]() Other large western cities readily visible here include Portland, Seattle, Phoenix, and Denver.įor Earth scientists, population density maps can be crucial in answering questions about the relationship between people and the environment. Like their counterparts in the east, the largest cities in the west (San Diego and Los Angeles in the south San Francisco, Oakland, and San Jose farther north) hug the coast, with the densest populations in Southern California. The west remains lightly populated except for clearly defined urban regions. Other cities-Atlanta, Chicago, Houston, and Dallas-punctuate the map in the country’s interior. Rings of decreasing population density radiate out from the major urban centers of New York, Philadelphia, and Washington along the East Coast. Where are all of these people living? This map, based on population estimates made in 2005, charts out the number of people in every square kilometer of the United States.Īs has been the case historically, the most densely populated parts of the United States are east of the Mississippi River. With one birth every 7 seconds, a death every 13 seconds, and a migrant entering the country every 31 seconds, the United States’ population is growing at a rate of one person every 11 seconds. ![]() The population of the United States reached 300 million on October 17, 2006, said the U.S. ![]()
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