{"version":"1.0","type":"rich","title":"Choropleth World population map","description":"A choropleth map shows the number of legal immigrants per country, with a threshold color scale ranging from gray to dark blue. Built with D3 v4, the visualization loads GeoJSON country boundaries and a CSV of immigration totals, then projects them using `d3.geoRobinson()` and draws paths with `d3.geoPath()`. Interactivity includes hover effects that highlight each country and display a tooltip with its name and total, plus a legend mapping color ranges to values.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/3f539771471344f0ab3edb35ccac24f9?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}