http://thfield.github.io/sf-census
draws a map of san francisco with census tract population by cohort
Data Provided By: City and County of San Francisco Planning Department Source Link: http://www.sfgov.org License: Open Data Commons Public Domain Dedication and License
converted to topojson with http://www.mapshaper.org/
drawn using d3.js with a lot of help from let's make a map and vector tiles
open street map tiles from Mapnik Vector Tiles
guidance on responsive map from http://eyeseast.github.io/visible-data/2013/08/26/responsive-d3/