Prototype of Geo Contours on Census Tracts

Census Tracts Contours with City Labels

This interactive visualization displays demographic data across New York City census tracts using colored contour layers, with orange representing the Black population and green representing the white population, overlaid with city labels. The code builds a spatial index with RBush, samples data points through turf.booleanPointInPolygon, and uses d3.contours with blur2 smoothing to generate the density regions. Orthographic projection, panning, and zooming are implemented via d3.geoPath, drag, and zoom behaviors. Census tract boundaries and demographic data come from processed government shapefiles and ACS datasets.

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Census Tracts Contours with Two Variables and City Labels

This example visualizes demographic patterns across New York City census tracts as smooth, colored contour layers, with orange representing the Black population and green representing the White population. The contours are computed from a grid of sampled values using spatial indexing with RBush and point-in-polygon tests via Turf. City labels appear for municipalities above a population threshold, and the orthographic projection supports pan and zoom interactions. The visualization relies on D3’s `geoPath`, `contours`, `geoTransform`, and `scaleSequential` APIs, with data sourced from the 2023 Census Tracts and ACS demographics.

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Grid Sampling on Census Tracts - Contours from Sampling

This interactive map displays the distribution of the Black population across New York City census tracts. It creates and renders contour polygons derived from a grid-sampled raster of demographic data, which is then blurred and thresholded using D3’s `contours` and `blur2` APIs. The contours are converted to GeoJSON via Turf, while the base layer uses `geoOrthographic` and `geoPath`. County data comes from the 2023 Census Tracts shapefile, enriched with ACS demographic estimates.

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Fork of Grid Sampling on Census Tracts - Contours from Points

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`.

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Fork of Grid Sampling on Census Tracts - Optimized

This example visualizes New York City census tracts on an orthographic globe projection, styled as a choropleth-like grid of points sampling each tract’s interior. The visualization shows demographic data from the U.S. Census Bureau’s 2023 ACS estimates. It uses `geoOrthographic`, `geoPath`, and a custom `map` module to render tract boundaries and a uniform grid of points, with an RBush spatial index and turf’s `booleanPointInPolygon` to test which grid points fall inside tracts. Drag and zoom interactions adjust the globe’s rotation and scale via `d3.drag` and `d3.zoom`.

New York City Census Tracts

This interactive visualization displays New York City census tracts on a rotatable and zoomable orthographic globe projection. The map shows tract boundaries with empty fills and thin black strokes, draggable to adjust rotation and zoomable to change the scale. The code uses d3.geoOrthographic, d3.geoPath, d3.drag, and d3.zoom to render and manipulate the map. Census tract geometry comes from a TopoJSON file downloaded from the U.S. Census Bureau and processed with Mapshaper, with demographic data from the American Community Survey.

Fork of Fork of Fork of Grid Sampling on Census Tracts - Coloring by Data

This visualization displays New York City census tracts as a grid of colored squares, where each square’s color intensity represents the Black population count within the tract containing that grid point. The map supports drag-to-pan and zoom interactions, using a geographic orthographic projection. It relies on D3’s `geoOrthographic` and `geoPath`, alongside Turf’s `booleanPointInPolygon` and an RBush spatial index for efficient point-in-polygon queries. Data comes from the 2023 Census Bureau shapefiles and American Community Survey demographics, both loaded as JSON.

Fork of Fork of Grid Sampling on Census Tracts - Coloring the Grid

This interactive map visualizes New York census tracts on an orthographic projection, with a uniform grid of circles overlaid across the viewport. Grid points inside tract boundaries render as larger, colored circles using a sequential Cubehelix color scale, while points outside remain small. The code uses `d3.geoOrthographic`, `d3.geoPath`, and `topojson-client` for rendering, with `@turf/turf` for point-in-polygon tests and `rbush` for spatial indexing. Census data comes from a Gist, and drag and zoom interactions adjust rotation and scale.