Although this aggregation facilitates sampling design and ensures that responses remain anonymous, it can also lead to inferential problems when attempting to analyze SES at a fine spatial grain 6, 7. 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. Select Oklahoma City.Assessment of socio-environmental problems and the search for solutions often require intersecting geospatial data on environmental factors and human population densities. But at the county level, it has a higher median age areas. What is surprising about Idaho is that at the state level, it is has a low median age.At this scale, which bordering state shows the sharpest contrast?.Step 14: Utah has the lowest median age in the United States. What could account for the many elderly in Florida?Īct: How does scale influence the interpretation of data?.Step 13: Turn on the layer, Median Age-UT & FL Tracts. Which five states show young populations?.Which state has the highest median age?.Step 10: Click the button, Show Contents (Content). How are median household income and cities related?Īnalyze: How does age differ across the United States?.Step 9: Click the button, Show Map Legend (Legend). Step 7: Turn on the two layers, Median Household Income, and USA Major Cities. How does physical geography affect population density?Įxplore: How does income vary across the United States?.Select, Transparency, and adjust it to 50 percent. To view two layers simultaneously, make one “see-through.” In the Contents pane, click the three dots beneath the layer name. Step 5: Make the USA Population Density layer 40 percent transparent. Step 4: Check the box to the left of the layer, USA Topo Maps. Step 3: With the Details button underlined, click the button, Show Contents of Map (Content). Step 2: Slowly zoom in on New York City or another urban area.Īcquire: Why does population density vary?

Which part of the United States is the most densely populated? Zoom into the most densely populated area.Step 1: Go to the ArcGIS Online map, USA Demographics, and explore the map.

Map us population density