As part of ArcGIS Living Atlas, the Policy Mapping team maintains a set of free layers that contain a wealth of data from the U.S. Census Bureau’s American Community Survey (ACS). In early December 2022, Census will release the newest ACS data for their 2017-2021 five-year estimates. Within days of that release, the Policy Mapping team updates the ACS layers already available in Living Atlas with this new update from Census. Maps and apps that already use these layers will automatically display the most recent Census ACS data.
The Census ACS layers in Living Atlas cover a wide range of topics on housing, income, internet access, education, disability, health insurance, and more. These layers contain data for states, counties, and census tracts. More than 100 layers are available, each focusing on a specific topic. Each topic’s layer is hosted as both boundaries and centroids for your use in analysis, mapping, charting, dashboards, Story Maps, ArcGIS Pro and other applications. These layers are free to use and can be exported to your local drive if needed.
The data is made available in ArcGIS Online as hosted feature layers, so all you need is an internet connection to use them. Through ArcGIS Living Atlas of the World, you can easily add these layers into your maps and analysis in ArcGIS Online and ArcGIS Pro. You can also use them within applications, dashboards, Story Maps, Insights, Business Analyst and many other ArcGIS tools.
- The boundaries always reflect the TIGER boundaries that are appropriate for the newest ACS figures. In this update, the 2021 TIGER boundaries will be used in the layers.
- 2020 Areal Hydrography sourced from Census was used to shoreline polygons near the ocean, Great Lakes and selected other water bodies.
- State, county and tract boundaries are shorelined where needed, with additional large or important water bodies cut out of the polygons. This supports map styles like dot density and map effects like drop shadow to work better.
- Additional fields – Requested fields such as Hispanic by Race from Census table B03002 to be added to the Race and Hispanic Origin layers and Ratio of Income to Poverty level from Census table C17002 to be added to the Poverty Status layers.
- These fields include highly-requested fields such as Hispanic Black and individuals with income that is 200% of poverty level.
- Updated legends – many of the layers center their map symbols and colors around the national figure of the attribute being mapped, to emphasize areas with higher or lower figures than that national figure. For example, the households without an internet subscription are shown as 14% currently in this layer’s legend. Once the update occurs in December 2022, a new figure will appear there based on the latest data. Both the center breakpoint with the new national figure and the top and bottom breakpoints are adjusted to reflect the latest values. The legends clearly state the updated national figures, helping create a reference point for the map reader. You can change it to use another significant value, such as the average for your state.
- The national value changes may be particularly noticeable for any currency values such as earnings, income, median contract rent, and median home value. See this blog on inflation to understand how your maps may be affected.
Using These Layers
The American Community Survey (ACS) helps local officials, community leaders, and businesses understand the changes taking place in their communities. It is the premier government source for detailed population and housing information about our nation. The ACS layers in Living Atlas provide many of the popular variables directly within the ArcGIS platform. Being able to access these brand-new data values directly within Living Atlas makes it easy to start understanding the changes taking place in your community or areas of interest through maps and further analysis.
Find the layers in ArcGIS Online:
Learn where to find these layers and start using them within your mapping and analysis workflows. Check out this story map to learn how.
Learn how to make a map about your community in four easy steps in this blog. You’ll have your own web map of your area in minutes!
Update your existing ACS maps:
When the new ACS figures are released by the Census and updated in Living Atlas, it’s time for you to check your web maps that use one of these ACS layers to see where you need to make updates to your map’s symbology and popups. If you are using an ACS layer from Living Atlas and have not modified it at all, then you will appreciate knowing that your layer has already been updated, with new data, updated symbology, and updated popups.
If you are using an ACS layer from Living Atlas and have modified its symbology, popups, etc., you’ll appreciate that the data has been updated, but your symbology and popups kept your modifications. To confirm, check out the layer properties in Map Viewer to see what properties are stored in the source layer or stored in the web map. The attribute data in the latest five-year ACS layers changes each December and is automatically reflected in existing maps. After this release, verify that your map’s symbology breakpoints and popups still make sense with the updated data.
Understand and use Margins of Error:
Earlier this year, we created a Learn Path full of resources that walk through different ways to incorporate margins of error (MOEs) into maps. We presented this work at the ACS Data Users Conference to show these exciting new ways to help everyone see and understand MOEs.
Recently released, this lightweight app helps you get a quick sense of how reliable estimates are for each tract, and how they become more reliable as you aggregate tracts using the boundary of a neighborhood or other shape. Check out this blog to learn more.
Business Analyst and GeoEnrichment:
Developers can access the latest available ACS Data through Esri’s GeoEnrichment Service, while Business Analyst users can access in the Business Analyst web app. Esri will release new ACS 2017-2021 data through GeoEnrichment Service and Business Analyst next year, typically around March or June. To learn how to use the current ArcGIS Living Atlas data in Business Analyst, please see the step-by-step guided blog or check out this guided tutorial video.