{"version":"1.0","type":"rich","title":"dv2020-ep37-viz39 - points on a map, using size","description":"This visualization displays world cities as circles on an interactive map, with circle size encoding population using a square-root scale. The map uses a natural Earth projection rendered via `d3.geoPath`, with country borders, shorelines, and graticules from World Atlas TopoJSON data. City coordinates come from a Simplemaps CSV, filtered to populations above 50,000. React manages the component state, while D3 handles geographic projections, scaling, and SVG rendering.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/3392eb39645645c5a20129f08c467a07?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}