{"version":"1.0","type":"rich","title":"A9- Choropleth Map","description":"This choropleth map visualizes US state populations using a purple color scale, with states lacking data rendered in gray. Built with D3.js, it loads GeoJSON and CSV data via `d3.json` and `d3.csv`, then draws state boundaries with `d3.geoPath` and `topojson.feature`. A quantized color scale (`d3.scaleQuantize`) maps population values to fills, and a legend with thresholds is rendered using `d3.pairs` and `d3.format`. The map is rendered as SVG with white state borders, and the legend sits in the lower right corner.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/f43b453fca194328b471177b14212fb1?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}