{"version":"1.0","type":"rich","title":"A9 - Proportional Symbols Map in D3","description":"This D3.js proportional symbols map visualizes the cost of living index across US states. Gray states are drawn with the `d3.geoAlbersUsa` projection and `d3.geoPath`, while semi-transparent red circles, sized by a square-root scale, are placed at state coordinates derived from an external latitude/longitude source. A legend displays four bubble sizes with corresponding index values. Hovering over a circle reveals a tooltip with the state name and cost index. Data is loaded via `d3.json` and `d3.csv`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/40349ca44f9e43c9ba015bd9c39c584e?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}