I get that it is pitch f/x data, but how reliable is that for determining the strike zone in every stadium? Each stadium is obviously uniquely designed which makes their systems at least questionable as to the accuracy of how it is measuring strikes. It is one thing to judge speed and movement of any one pitch, but the strike zone is fluid throughout the league, from ump to ump, batter to batter. There are a whole bunch of reasons why a pitch that any one stadium's system determines to be in the zone may be called a ball. The cameras track the trajectory of the ball, and it's accurate to within an inch. Since mounds, distances to the plate, and size of the plate are consistent from park to park, the data will be consistent across the board. There can be fluctuations from park-to-park. See point 3 here. The fluctuations aren't in the data, they're in the conditions at the park. Right, but the net result is the same. The same pitch thrown in 2 different parks can look differently in the data.