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?