A choropleth map shades geographic regions by data value, making spatial patterns in quantitative data instantly visible. It is one of the most popular thematic map types for comparing statistics across countries or states.
This sample visualizes ECDC COVID-19 case data worldwide as of April 2020, loaded from a JSON source. An ordinal color scale with eight ranges maps total confirmed cases to a red gradient, while a bubble overlay sizes each country by its death toll. A categorical legend on the right explains every color bracket, and tooltips report the exact case and death counts on hover.
Follow the step-by-step Choropleth Map Tutorial to learn how this map was built. See the Choropleth Map documentation for all configuration options.