Visual analytics of COVID-19 dissemination in São Paulo state, Brazil

[Display omitted] •A visual analytics system to monitor COVID-19 evolution.•Analysis of COVID-19 in cities of the São Paulo state, Brazil.•Novel concepts of COVID-19 dissemination considering hierarchical spreading. Visual analytics techniques are useful tools to support decision-making and cope with increasing data, particularly to monitor natural or artificial phenomena. When monitoring disease progression, visual analytics approaches help decision-makers to understand or even prevent dissemination paths. In this paper, we propose a new visual analytics tool for monitoring COVID-19 dissemination. We use k-nearest neighbors of cities to mimic neighboring cities and analyze COVID-19 dissemination based on comparing a city under consideration and its neighborhood. Moreover, such analysis is performed within periods, which facilitates the assessment of isolation policies. We validate our tool by analyzing the progression of COVID-19 in neighboring cities of São Paulo state, Brazil.