The Northside Healthy Eating Project: Transportation Access to Affordable Fresh Produce (PDF)
Pages 7-14 explain the methodology of using GIS (Geographic Information Systems) data to identify obstacles in transportation to food. (Please note that the USDA website referenced on page 9 can be found here.) Appendix III, beginning on page 40, includes these maps.
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- Food Access: Linking Geography, Poverty, and Hunger in the U.S. Food and Society Workshop