{"version":"1.0","type":"rich","title":"Tree Map","description":"This tree map visualizes hotel booking lead times aggregated by country, with each country’s total lead time represented as a rectangular area. The code uses D3 v5’s `nest()` and `rollup()` to sum lead times per country, then builds a hierarchy with `d3.hierarchy()` and lays it out with `d3.treemap()`. Data comes from a local `population.csv` file, rendered as an SVG canvas sized to the browser viewport. The example is built with React and D3, though the visible rendering relies solely on SVG and D3’s treemap layout.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/e7accaa2eb614dc88705b5d4037ab590?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}