{"version":"1.0","type":"rich","title":"test Choropleth map in D3","description":"This choropleth map displays poverty estimates for US counties in 2021, with each county shaded according to its poverty rate using a blue sequential color scale and a legend with tick marks. The visualization also includes state boundary outlines overlaid on the county polygons. Built with D3 v5, the map uses `d3.json` to load TopoJSON data from the us-atlas collection and `d3.csv` to parse county-level poverty rates, then renders the geography via `d3.geoPath` and `topojson.feature`. The color encoding applies `d3.scaleThreshold` and `d3.schemeBlues`, while an axis legend is generated with `d3.axisBottom`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b9a634cde00041f88c17fb26ec8b129a?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}