{"version":"1.0","type":"rich","title":"second","description":"This tree visualization displays a hierarchical dataset of cities organized by continent and country, with population values shown on hover. It loads city data from a CSV URL with automatic fallback to built-in sample data. The implementation uses D3 v7’s `d3.hierarchy`, `d3.tree`, and `d3.linkVertical` to compute and draw the layout, then appends SVG circles and text labels with color-coding by tree depth.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b04997c5cc8c40409f737d256722e17d?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}