{"version":"1.0","type":"rich","title":"Opacity Linear Scale","description":"This example visualizes the racial composition of New York Census tracts by encoding the white population count through a green color whose opacity varies on a linear scale—more opaque green indicates more white residents. The map renders as SVG paths using `d3.geoPath` and TopoJSON, with data from the American Community Survey API fetched via `d3.json`. Opacity is controlled by `d3.scaleLinear` mapping the maximum white population to an `rgba` range from transparent to fully opaque green, while `d3.zoom` enables pan and zoom interaction.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/e73025c231e445e09cbdfa9f421246e8?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}