{"version":"1.0","type":"rich","title":"d3 Choropleth Map","description":"This example displays Massachusetts town boundaries as a choropleth map using two different projections: a U.S.-oriented Albers projection and a Massachusetts-specific conic conformal projection. The code loads TopoJSON geographic data and renders map outlines with `d3.geoPath` and `d3.geoConicConformal`. A color legend module (`colorLegend`) adds a visual key with circles and text, while hover interactions highlight regions via CSS. The visualization uses SVG rendering with D3 v5 and TopoJSON utilities.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/8bfa4df8a6544fd3b180072ea39d22ae?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}