ABSTRACT
Geographic information systems (GIS) and choropleth maps for COVID-19 cases as well as COVID-19 test and vaccination rates proved very valuable to informing decision-making on the local and regional levels of government in Shelby County, Tennessee, USA. The authors have all served on the City of Memphis and Shelby County COVID Joint Task Force and share here their observations about the challenges and promises related to these techniques in the context of a fast-changing environment. As the pandemic unfolded, new virus variants emerged and the population became increasingly vaccinated. Consequently, the use of GIS changed, and maps needed to be continually adapted to the shifting needs of decision makers. The authors describe their approaches to leveraging GIS techniques to monitor the spread of the disease, draw conclusions about the effect of policy measures, and address health disparities. They outline the strengths and weaknesses of choropleth maps, reflect on how best to facilitate interorganizational communication of the derived information, and suggest desirable aspects of educational courses for GIS as well as skill sets in personnel that they came to appreciate as essential. © 2023 Taylor and Francis Group, LLC.