Using Clusterpie Markers to Map COVID-19 Cases in Southern Ontario

On March 30, 2020, the Ontario government enhanced its daily reporting of COVID-19 cases in the province. We summarized how these enhancements – especially the daily epidemiological summary – might address our critique of the government’s earlier reporting.

Shortly after introducing its daily epidemiological summary, the Ontario government also began publishing daily updates of confirmed positive COVID-19 cases in the province.

With a view to making these data more accessible and meaningful to the general public, we have been exploring different ways of visualizing the spread of COVID-19 over time and space.

Our first example was an interactive map of the growing number of confirmed cases of COVID-19 by Public Health Unit (PHU) in southern Ontario over a 45 day period (February 22 – April 6, 2020).

Our next example is an interactive map of clusters of 7,344 COVID-19 cases, classified by Outcome (Resolved, Fatal, Not Resolved), identified by PHUs in southern Ontario, as of April 13, 2020 (or view fullscreen version):

About interpreting and interacting with the map:

About the location of clusterpies and simple coloured circles on the map:

In this exercise, we have relied on the contributions of many supporters of the free and open exchange of technology and information. We are especially indebted to Bård Romstad for his development of clusterpie markers to map personal accidents and injuries on the streets of Oslo, Norway.

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.