{"version":"1.0","type":"rich","title":"Choropleth map","description":"A choropleth map of COVID-19 cases by country, with each nation colored on a spectral scale via `d3.scaleOrdinal` and `d3.schemeSpectral`. Hovering highlights a country in red, and a click-drag zoom uses `d3.zoom` with a Natural Earth projection (`d3.geoNaturalEarth1`) and `d3.geoPath`. Data loads from a CSV and TopoJSON using `d3.csv`, `d3.json`, and `topojson.feature`; a custom color legend renders SVG circles and text.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/0cdac689a7f043838f63db4574375b1c?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}