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Master of Science in Geographic Information Science and Technology
Master of Science in Geographic Information Science and Technology
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ItemRedefining the Food Desert: A Study of Grocery Store Accessibility Within Metropolitan Atlanta (2023)(Georgia Institute of Technology, 2023-07-28) Moss, David“Food deserts” are areas of an urban environment that are judged to have no accessibility to a nearby grocery store. Traditionally, this accessibility is based on a simple measure of Euclidean distance, i.e. a circle of a given radius drawn around the nearest grocery store, thus ignoring the actual road network used to travel to said store. This paper proposes a methodology for constructing isochrones, polygons which both incorporate the actual distance travelled to reach a given grocery store, as well as the time it takes to traverse said distance via a variety of different modes. Doing so dramatically reduces the estimated coverage area of a given grocery store, and helps visualize the inequities inherent in using distance-based measures of accessibility without accounting for the mode taken to travel that distance, which particularly harms individuals without access to cars or bikes.