Firefly Map of Coronavirus Case Locations
This interactive map displays the locations of confirmed Coronavirus cases as of March 5, 2020, with each point rendered as a glowing firefly-like sprite of uniform size and intensity regardless of case count. The visualization uses OpenLayers with React to manage the map and vector layers, while D3’s `cubehelix` function generates radial gradient sprites that combine a bright core with a soft Gaussian falloff. Data comes from the Johns Hopkins COVID-19 time-series CSV, filtered to include only locations with non-zero cases, and is projected onto a Stamen toner-lite basemap.
AI-generated descriptionFirefly Cartography with OpenLayers and React.
Each point on the map is a location for which there was at least one confirmed Coronavirus case as of 3/5/2020. Each location is shown as the same size and intensity, regardless of how many cases there were (this is a shortcoming of this visualization).
Data from Johns Hopkins: CSSEGISandData/COVID-19;