{"version":"1.0","type":"rich","title":"Choropleth population map","description":"A choropleth map of the United States displays 1990 county-level population estimates from a CSV file, with counties shaded from light beige to dark red based on population. The map uses a blue-to-red sequential color scale, and hovering over a state dims others, highlights the selected one with a black stroke, and shows a tooltip with the state name and its population value. Built with D3.js (d3.v3), the visualization uses `d3.csv` to load data, `d3.geo.path` to render geographic features from a TopoJSON file, and `d3.mouse` events to manage tooltip positioning.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b8b61c642f454daf81ec8eb3b0286d35?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}