![]() ![]() Typical census data is aggregated to ensure that each spatial unit has a minimum population size. Census Bureau aggregates population estimates to areal units such as counties or census blocks, which vary in size based on population density, but do not natively support high-resolution gridded population estimates. Census Bureau through the decennial census and American Community Survey, and many other countries have similar programs. In the United States (U.S.), population data is provided by the U.S. Population data only attains high accuracy when aggregated spatially. This data release answers the need for spatially resolved population distribution estimates that are integral to informing research, policy and management decisions across a range of SES challenges 5. Whereas, environmental systems data is increasingly available at high levels of spatio-temporal resolution through advanced remote sensing technologies, the provision of population data at a similar resolution has been more challenging 4. 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. is one of the most populous countries in the world, with a total population of over 327 million inhabitants, as of 2018.Assessment of socio-environmental problems and the search for solutions often require intersecting geospatial data on environmental factors and human population densities. Most of the leading countries and territories are city states. Only 1.3 inhabitants per square mile reside in the largest state of the U.S.Ĭompared to other countries around the world, the United States does not rank within the top 50, in terms of population density. A number of New England states follow at the top of the ranking, making the northeastern region of the United States the most densely populated region of the country. Rhode Island is the second most densely populated state, with slightly over 1,000 inhabitants per square mile. ![]() The most densely populated state is New Jersey, with 1,208 people per square mile living there. The population density of the United States varies from state to state. Population density doubled in 1900, and grew in total by around 800 percent until 2010. Since then, population density grew by about 16 percent each decade. Population density was roughly 11 at the time and has doubled in the last century. After examining the data in detail, it becomes clear that a major population increase started around 1870. Over the last two centuries, the number of people living in the United States per square mile has grown from 4.5 in 1790 to 87.4 in 2010. Population density has been tracked for over two hundred years in the United States. In 2019, the population density was approximately 92.9 residents per square mile of land area. This graph shows the population density of the United States of America from 1790 to 2019. ![]()
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