Old school D3 from simpler times
Canadian Trade Map (Divided Edges)
A map of Canadian trade between economic regions (divided edge version).
Directed and divided edges, using linear gradients to show direction (copied from the Thanksgiving Upshot).
Shapefiles from Statcan website. Trade data...is made up. And of course d3.js and topojson.js.
Click to zoom to an ER, or scroll zoom. Click and drag to pan around the map.