I created two layers for this map. The green circles you see when zoomed out summarize the number of food establishments that accept food stamps by neighborhood. When you zoom in, you see the individual establishments. I created all of the icons using Inkscape and the Maki tile set, except for the apple icon, which I downloaded from the internet.
Double-click to zoom in and see locations and types. Zoom out to see a summary of the number of retail food establishments accepting food stamps by neighborhood.
The underlying data is available on DataSF.