{"version":"1.0","type":"rich","title":"Choropleth population map","description":"A choropleth map of the United States displays state-level population counts from 1990, using a color gradient from light orange to dark red. The map is rendered as SVG with D3 v3, leveraging `d3.geo.path` and TopoJSON for state boundaries. Population data from a CSV file is joined to state IDs, and a custom `d3.scale.quantize` interpolates colors across 100 steps. Hovering over a state triggers a tooltip and animates opacity, while the legend and interactivity are built with jQuery and D3 transitions.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/3c5da23eda7a499e9bbbbeec0588618e?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}