Skycam The Henry Ford's Innovation Nation
Football meets tech: A brief history of technology on the gridiron - CNET
Super Bowl 50 camera technology will give fans dramatic new views of game – GeekWire
The Story Behind the NFL's Magic Yellow First-Down Line - Insight Replay
At a big football stadium they sometimes have cameras that fly over the pitch that appear to be attached by 'ropes' has the football ever hit one of these 'ropes? - Quora
Evolution of NFL Sideline Technology
Monday Nights Belong to ESPN, Twitter; Match Made in 2nd-Screen Heaven
AMAZING Technology! From Yellow Line to skycam and Pylon Cam