{"version":"1.0","type":"rich","title":"fresh block","description":"This visualization animates a global map of urban population growth, plotting 2015 and 2030 projections for cities as linked circles. Using D3 v4, it renders an SVG world map and projects city coordinates onto a canvas, with each city represented by a circle whose radius encodes population. A transition animates the circles between the two years, and a legend, likely with a color scale, distinguishes 2015 from 2030 values. Hover interactions may reveal city details.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-5a563ac59ed7293cc7f6ebb02d425d8a?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}