• State of Iowa. (n.d.). Iowa Open Data Portal – Iowa Crashes Dashboard.
https://data.iowa.gov/stories/s/Iowa-Crashes/m73g-tzgc

• OpenStreetMap pedestrian infrastructure and amenity data, including footways, sidewalks, crossing points, parks, bus stops, and shops.
https://www.openstreetmap.org

• U.S. Census Bureau population and census tract data.
https://www.census.gov

• Ames municipal boundary and basemap layers derived from OpenStreetMap and public GIS basemap services.