Once upon a time, all we had were box scores. We might know a player went 1-3 with a double and a walk, but we wouldn’t know how exactly all of the game’s events unfolded. We’ve come a long way since then, getting play-by-play data, pitch-by-pitch data, video tracking, PITCHf/x, and Statcast. We have results data stretching back more than a century, but the way those results came about gets easier to understand with new information.
What direction was the double hit? How far did it go? Who fielded it? Hearing a player hit a double seems like specific information, but there’s plenty more you might want to know about that event. One of the ways we communicate that information is through Spray Charts.
There are certainly other ways to communicate information of this nature, but one implementation is to display it visually on a diamond graphic and you can find our implementation of spray charts on the player pages here at FanGraphs.