Access to healthy food is obviously important, but unfortunately it is not universal. Proximity of individuals to supermarkets is one way to help locate under-served communities. Bringing supermarkets to these communities is an easy way to help bring better food to their dinner tables.
The first I heard about the need for supermarkets to these communities was watching the second episode of Penn State's Geospatial Revolution Project. This video, released in November 2010, had a section about how GIS was being used to bring supermarkets into under served locations in Pennsylvania.
The latest map I have seen is the Supermarket Access Map, which utilizes ArcGIS Online.
These are just two examples of how GIS is being used to help communities.
