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Originally Posted by GioforPM
Hawkeye is the tennis stuff right? I would think it requires an unobstructed view.
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Yes, they also have a soccer version (and have tested it with other sports, like baseball and cricket too). It is a "visual" system that requires at least three cameras to have at least a partial view of the ball at all times to triangulate its position.
It wouldn't work for hockey (or football, for that matter) because the situations where it would be most useful are those where the puck is out of view of any of the cameras.
This weekend, during the All Star Game, we're supposed to hear more about the league's plans for the new player and puck tracking technology that will be rolled out league-wide next season. It uses a microchip embedded in the puck to track its position at all times.
The question there is with the level of accuracy of the technology. If it's accurate to within a couple of inches, it would be good enough for tracking things like the speed and direction of travel. It would need to have close to mm accuracy to be used for goal line decisions. Ideally, it would also need to be able to determine the orientation of the puck as well for the really close goal line calls.