What is the margin of error of ESPN's Shot Spot?

I Googled, and cannot find an authoritative pronouncement.

Shot Spot is the replay system used during ESPN Tennis telecasts to determine the legitimacy of an official’s call. When a player challenges a call, we see an animated, hypothetical track of the ball and the spot where it landed relative to the boundaries.

If the landing spot is 1 millimeter outside the line, the call is “Out,” and if 1 millimeter on the line, the call is “Good.”

My question is, if the margin of error is high (say plus or minus 3" in every direction) , can the majority of close Shot Spot calls be regarded as truly valid?

No one has an answer?

Is this the Hawk-Eye?

According to http://en.wikipedia.org/wiki/Hawk-Eye it just might be — at least it was used at the Open in 2006:

“Hawk-Eye has been used in television coverage of several major tennis tournaments, including Wimbledon, the Stella Artois at Queens, the Australian Open, the Davis Cup and the Tennis Masters Cup. The US Open Tennis Championship announced they would make official use of the technology for the 2006 US Open.[2] It is also used as part of a larger tennis simulation implemented by IBM called PointTracker. Along with Cyclops and Auto-Ref, it is one of several automated line-calling mechanisms used.”

To my chagrin, the 2007 Open is on USA, not ESPN. So I guess it’s Hawk Eye.

But I still have the question of the tracking system’s margin of error.

According to

“Dr Paul Hawkins, the creator of Hawk-Eye, the ball-tracking technology”…is… “accurate to within 3mm.”

Thank you all. :stuck_out_tongue: :stuck_out_tongue: :stuck_out_tongue: