{"version":"1.0","type":"rich","title":"Proportional Symbols Map","description":"This visualization shows a proportional symbols map of U.S. states, where circle size encodes each state’s cost index and the top nine highest-cost states appear in red. It uses D3 v7 with SVG rendering, a `d3.geoAlbersUsa` projection, and `d3.geoPath` for both state boundaries and symbol placement. A `d3.scaleSqrt` maps cost indices to circle radii. The code loads state polygons from us-states.json and point data from expensive-states.json, adding tooltips on mouse events.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/4ef7b46068b148afbcb4c081d5598b08?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}