The 2014 FIFA World Cup is the 20th since the inaugural tournament
in 1930, and the second time that Brazil has hosted the competition. It becomes
the first World Cup to feature goal-line technology.* The ball now has embedded magnetic strips,
which send a signal to the referee if they cross a sensor in the goal mouth.
This is used in combination with a high-speed camera system which can
triangulate the ball's exact location.
Reference
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World Cup 2014 Goal-line Technology, The Rio Times:
http://riotimesonline.com/brazil-news/rio-sports/2014worldcup/world-cup-2014-goal-line-technology/
Accessed 22nd May 2011.
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