{"version":"1.0","type":"rich","title":"Final Project Progress 4","description":"This interactive choropleth map visualizes 2024 Boston Marathon finisher data across U.S. states, with a clickable legend to toggle between four metrics: number of finishers, average finish time, average age, and average second-half split difference. The map uses D3’s `geoAlbers` projection and `geoPath` to render state boundaries from TopoJSON via `topojson-client`, while CSV data is parsed with `csvParse`. Hover effects and a tooltip are implemented with D3 selections, and color scales from `scaleLinear` update state fills dynamically.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/ff1f855c388f41ef96a21df52add30b9?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}