{"version":"1.0","type":"rich","title":"Choropleth of spanish cities by population","description":"This choropleth maps Spanish provinces by their share of the national population, using a blue sequential color scale with a horizontal legend. The visualization is built with D3 v3 and TopoJSON, loading province boundaries and population data from a TSV file. Province polygons are colored via a quantized scale based on population percentage, and hovering over a region displays a tooltip with the province name. Major cities are marked with red dots and labeled with their names. The map uses a Mercator projection and includes subtle dashed boundaries between provinces.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-4320a4df6c64ad539225b61c0b0c8fca?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}