On: Mapping Migration in the United States

[transcranial]

it's D3.js

[un_publishable → transcranial]

And more specifically d3.geom.voronoi() https://github.com/mbostock/d3/wiki/Voronoi-Geom

These examples are by D3.js author Mike Bostock, who currently works at The NYT. http://bl.ocks.org/mbostock/4060366 http://bl.ocks.org/mbostock/4360892

[dkannan → un_publishable]

Mark DiMarco gave a talk at JSConf 2014 called User Interface Algorithms which touches upon this

http://youtu.be/90NsjKvz9Ns?t=4m10s

relevant section starts at 4:13

rest of the talk is good as well