block by hugolpz 4f4958fd6a9306e82082

Choropleth with makefile

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[By: mbostock. Forked for later adaptation]. This variation of the unemployment choropleth uses topojson –projection to create projected TopoJSON with the d3.geo.albersUsa projection.

This example also uses the -e argument to join the county geometries with a TSV file of unemployment rates, simplifying the implementation and eliminating the need to load multiple data files.