{"version":"1.0","type":"rich","title":"second","description":"This interactive D3.js v7 tree visualization displays the hierarchical relationship between continents, countries, and cities based on population data. It uses a vertical tree layout with color-coded nodes for each level (root, continent, country, city) and interactive tooltips that show population details on hover. The visualization is built with D3's `d3.hierarchy`, `d3.tree`, and `d3.linkVertical` APIs, rendering as SVG, and loads sample data from a JavaScript array with an optional CSV URL fallback.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/7492ddaa069243e4941fa2da1fd123a3?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}