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Last edited Jun 13, 2016

Created on Jun 13, 2016

This visualization shows changes in U.S. commuting patterns over time, mapping the flow of workers between counties. It uses a chord diagram to display origin-destination pairs, with the arcs coloring and scaling by the number of commuters. The code relies on `d3.forceSimulation` for the node layout and `d3.geoPath` to project county boundaries from Census data. It also uses Canvas `getImageData` to optimize the rendering of the curved links, which are drawn with `d3.curveCatmullRom`. The data is a subset derived from the U.S. Census Bureau’s Longitudinal Employer-Household Dynamics dataset, preprocessed for the gist’s included CSV files.

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