{"version":"1.0","type":"rich","title":"30. Sized Points on a Map","description":"A world map displays cities with populations over 50,000 as semi-transparent points sized by population using a square-root scale. The rendering combines country landmasses, interiors, and graticules from the World Atlas TopoJSON data, projected via `d3.geoNaturalEarth1` and drawn with `d3.geoPath`. City coordinates are projected and plotted as SVG circles whose radii derive from the population values loaded from a Simplemaps CSV.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b5bab66ffb09418aaad0baa172ee9be8?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}