{"version":"1.0","type":"rich","title":"d3 + TopoJSON","description":"This example shows a map of U.S. counties rendered as gray SVG paths with white borders, which turn red on hover. It loads a TopoJSON file from a gist and converts it to GeoJSON using `topojson.feature`, then projects and draws each county with `d3.geo.path()`. The code relies on d3.v3 and TopoJSON v1, and the map uses a default projection without custom zoom or interaction.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-4d2f31e2c2748310ea332fb0d352a8fe?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}