This is the map of Nielen Designated Marketing Areas using D3.js. Hover over for data related to each area.

See map here

See code here

• Map adapted from Mike Bostock's map example
• Original topojson made by converting shapefile from here to topojson via Mike Bostock's instructions
  • Shapefile link is dead, an archived Geojson from Geocommons can be found here
• Nielsen rank and TV data via tvb

• Some areas are shaped really strangely (such as a slice of Nevada being part of the Denver media market) but that is really how they are divided