US Map of Nielsen Media Markets

This is an interactive map depicting the percentage of cable TV subscribers across the United States. The odd puzzle pieces as oppossed to standard state boundaries are Nielson Designated Marketing Areas (DMA). With a few exceptions, DMA's are collections of county jurisdictions. I created the shapefile which stores these geographies by merging a U.S. counties file from the U.S. census bureau using QGIS. At the time, I was working in advertising, and this allowed me to combine statistical datasets from Nielson with a multitude of other datasets formatted along different boundaries.