This is extremely interactive. If you drag on the map and select all values at a ballpark, this will update on the second view. Color represents ballpark. Clicking anywhere on the map after a park is selected resets the view. You can look at horizontal angle, speed off bat, inning and type (as determined by Hit Tracker). If you want to look at only a specific year, turn off the "Show History" option and select the year. If you hover over a point, it will give information about it. This is updated through the 27th of May, so it is missing any home runs after that day.