I missed this story on Pitch f/x a year ago:
Since 2006, Major League Baseball Advanced Media LP, baseball’s swashbuckling digital arm, has quietly spent approximately $4 million installing sensor cameras in major-league stadiums that can track and record the trajectory of every pitch. The system, called Pitch f/x, made its public debut in the 2006 postseason. This season it became operational in all 30 major-league parks.
Now The Daily Fix provides a link-rich synopsis of the history of Pitch f/x (above) and the work of people like Dave Allen at Baseball Analysts in mining the data. Allen’s work is collected here, in reverse chronological order.
(From a design perspective, note the dramatic difference in readability between the rainbow-wig Run Value heat maps and the gray-scale Home Run Rate heat maps.)

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