{"version":"1.0","type":"rich","title":"Fork of Grid Sampling on Census Tracts - Contours from Points","description":"This interactive map visualizes contours of Black population density across New York City census tracts, projected on a rotatable orthographic globe. The visualization uses D3’s `geoOrthographic`, `geoPath`, and `contourDensity` APIs to generate smoothed density bands from tract centroid points weighted by population and land area, colored with a sequential orange scale. Census tract boundaries appear as thin black outlines, while drag and zoom interactions rotate and scale the projection in real time via `d3.drag` and `d3.zoom`. Data comes from the 2023 Census shapefiles and ACS demographics, loaded via `d3.json` and processed with `topojson-client`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/1e402224ad9e4d00922500396a3e4fe7?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}