{"version":"1.0","type":"rich","title":"A9 - Choropleth Map","description":"This choropleth map displays the percentage of adults age 25 and older with a bachelor’s degree or higher across U.S. counties, using data from the FreeCodeCamp education dataset. Counties are colored with a threshold scale using `d3.schemePurples[8]`, with missing data rendered in gray. The map is built with React and D3 v5, using `d3.geoPath` to project county boundaries from TopoJSON, while a custom legend and hover tooltip show exact percentages. The tooltip positioning and visibility are handled manually through mouse events.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/4c69dbc674ce4d8e9cf36be88b2531cc?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}