{"version":"1.0","type":"rich","title":"Opacity Linear Scale","description":"This visualization maps New York census tracts, using a green color scale to represent the white population density—the greener the tract, the more white residents it has. The data comes from the American Community Survey API, joined with TopoJSON geometry from a GitHub gist. The code uses d3.scaleLinear to map white population counts to an opacity range, creating a semi-transparent overlay, while d3.geoPath renders the tract shapes and d3.zoom enables pan and zoom interaction.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/8067969ff1a14d94b7c94fac12b4803c?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}