Fork of Multivariate Choropleth Live Coded at Outlier

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Fork of Multivariate Choropleth Live Coded at Outlier

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Last edited Mar 13, 2021

Created on Mar 13, 2021

Forked from Multivariate Choropleth Live Coded at Outlier

This example visualizes racial demographics across New York census tracts by blending colored transparent layers for white, black, and Asian populations. The map uses D3 v5 with `d3.geoPath` and TopoJSON to render tract polygons, while the `color-blend` library applies multiplicative blending of `scaleSqrt`-mapped opacity values for each racial group. Data comes from the American Community Survey API, fetched as JSON, with darker composite colors indicating higher population densities. The visualization supports interactive zoom via `d3.zoom` and hover logging of tract properties.

AI-generated description

An intermediate state on the way towards trying to visualize multidimensional data for census tracts. The more green it is, the more white people there are.

This uses a linear scale that varies in opacity only.

Data from bl.ocks.org: New York Census Tracts by Mike Bostock.

Fetching of American Community Survey data inspired by Observable: Racial distribution in NC by Mark McClure.

The variables used are documented in the ACS API Reference.

MIT Licensed

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