{"version":"1.0","type":"rich","title":"Choropleth Maps","description":"This choropleth map displays the percentage of adults with a bachelor’s degree or higher across U.S. counties for 2015–19, using a purple sequential color scale (d3.schemePurples) with a threshold legend. County boundaries are drawn via d3.geoPath, while state outlines are rendered as white meshes using topojson.mesh. Hovering a county highlights it with a black stroke via mouseover/mouseleave transitions. The data merges TopoJSON geographic shapes with CSV values keyed by FIPS codes, and the visualization is built with React and SVG inside a D3 v5 environment.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/5a6717b8752c4897be60cbba2865a76a?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}