Therefore, SES research requires a detailed understanding of where people live in relation to environmental factors. Socio-environmental systems (SES) are highly complex and key to the assessment of their dynamics, including the provisioning of ecosystem services and risks posed by environmental hazards and public health outcomes, is linking people to the environment with which they interact 3. There is growing awareness that solutions to pressing challenges in environmental science require characterizing interactions and feedbacks between social and natural systems 1, 2. The dataset, known as the U.G.L.I (updatable gridded lightweight impervious) population dataset, compares favorably against other population data sources, and provides a useful balance between resolution and complexity. The methodology is updatable using the most recent Census data and remote sensing-based observations of impervious surface area. The workflow dasymetrically distributes Census block level population estimates across all non-transportation impervious surfaces within each Census block. With this data release, we provide a 30-m resolution population estimate for the contiguous United States. However, timely acquisition of such data at sufficient spatial resolution can be problematic, especially in cases where the analysis area spans urban-rural gradients. In the United States, Census data is the most common source for information on population. Animated map of population density in the U.S.Assessment of socio-environmental problems and the search for solutions often require intersecting geospatial data on environmental factors and human population densities. Currently, the three most populous states in the US are California (39.5m), Texas (28.3m), and Florida (21m).Īt present, the population’s median center continues to move to the southwest slowly (2.57 miles per year). After 100 years, the population of California increased by 504% to 39.9 million. So in 1917, only 3.1 million people lived in California. But over the past century, the distribution of the population in the nation has changed dramatically. Until the 20th century, the eastern states remained the most populous. Throughout the nineteenth century, more than one square mile (1.6 million km2) of land west of the Mississippi River was obtained by the federal government. The map below shows when each state reached its highest point as percentage of the U.S. Populations for intermediate years were interpolated by cubic splines to log-density essentially, that means that it assumes a smooth change in the rate of growth for each county over time. The animated map of population density, made using Jonathan Schroeder’s county-level decadal estimates. Reddit user: NelsonMinar Animated map of population density in the U.S. As a result, many indigenous peoples died from disease than in war with Europeans. In that time, many deadly diseases evolved in the Old World (smallpox, the plague, measles). The Americas’ peoples had no resistance to Europeans’ diseases because the Americas’ populations had been primarily isolated from Europe. Most of the indigenous tribes of America lived along the rivers and on the coasts of the Atlantic and Pacific oceans. But beginning in the 19th century, archaeology and the research of burials and the material remains of society helped determine native populations before European contact.Īpproximations for North America have ranged from 3.8 million to 18 million. Most indigenous people lived in small communities. It isn’t easy to evaluate populations in the 15th century in America. Population density map of what is now the United States (1492) But during the country’s history, these numbers haven’t stayed fixed. (1990 – 2017)Īt the moment, about 328 million people are living in the U.S, a nation that’s 9.84 million sq km (3.53 million square miles). Animated map of population density in the U.S.
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