{"version":"1.0","type":"rich","title":"A9 - Proportional symbols map","description":"This map of the United States visualizes transportation costs by state using proportional green and grey circles, with the ten most expensive states highlighted in brown. A tooltip displays the exact cost when hovering over a circle. The chart is built with D3 v3 and topojson, using an SVG path with `path.pointRadius` to size symbols by a square-root scale. A hand-coded legend, an animated tooltip via `div.transition`, and state boundary paths rendered from TopoJSON complete the interactive display.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/3a28e89d5c344f81bf930ea8d29a293e?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}