Fig. 6From: Geographical tracking and mapping of coronavirus disease COVID-19/severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) epidemic and associated events around the world: how 21st century GIS technologies are supporting the global fight against outbreaks and epidemicsThe Guangzhou Underground COVID-19 tracking and notification service. The actual practical value and ultimate success of such services deployed for the first time should be documented and confirmed at the end of the outbreak, so that the world community can learn from the experienceBack to article page