Epidemics caused by airborne viruses in cities with large populations create a big problem as in the current COVID-19 pandemic . Cramped lifestyle, busy workplaces, crowded public transportation, and higher household member counts are responsible for the transmission of the disease . In Turkey, Istanbul has taken the lead in the number of cases since the beginning of the epidemic . The excess population density is the major cause for disease transmission . It is essential to monitor the contaminated regions with geographical information systems on city maps . Outbreak maps visualize and help analyze the patterns of transmission and serve as a communication and education tool . A dynamic heat map video of SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) polymerase chain reaction positive cases in a county of Istanbul was generated . The heat map visualizes how the epidemic spread to all the districts and the cumulative cases increased in one county of Istanbul with real attack rates.