Glossary of Hit Tracker Terms
|True Dist. (True Distance, a.k.a. Actual Distance) - If the home run
flew uninterrupted all the way back to field level, the actual
distance the ball traveled from home plate, in feet. If the ball's
flight was interrupted before returning all the way down to field
level (as is usually the case), the estimated distance the ball
would have traveled if its flight had continued uninterrupted all
the way down to field level.
|Std Distance (Standard Distance) - The
estimated distance in feet the home run would have traveled if it
flew uninterrupted all the way down to field level, and if the home
run had been hit with no wind, in 70 degree air at sea level.
Standard distance factors out the influence of wind, temperature and
altitude, and is thus the best way of comparing home runs hit under
a variety of different conditions.
|Speed Off Bat - The calculated speed of the
baseball as it left the bat, in miles per hour (mph).
|Elev. Angle - the angle above horizontal at
which the ball left the bat, in degrees. Typically between 25 and 45
degrees for home runs.
|Horiz. Angle - the initial direction of the
ball as it left the bat in degrees, where 45 degrees is straight
down the right field line, 90 degrees is straight over second base
and 135 degrees is straight down the left field line.
|Apex - the highest point reached by the ball
in flight above field level, in feet.
|Impact Due To Wind - the distance gained or
lost due to the impact of the wind on the ball in flight, in feet.
Distance lost to the wind is listed as a negative number, while
distance gained from the wind is listed as a positive number.
|Impact Due To Temperature - the distance
gained or lost due to the impact of the ambient temperature, in
feet, as compared to a "standard" temperature of 70 degrees.
Distance lost to the increased resistance of cooler, more dense air
is listed as a negative number, while distance gained from the
decreased resistance of warmer, less dense air is listed as a
|Impact Due To Altitude - the distance gained
or lost due to the impact of the ballpark altitude, in feet, as
compared to a "standard" altitude of zero feet (sea level).
Currently, there are no ballparks located below sea level, so there
are no negative numbers; distance gained from the decreased
resistance of the less dense air at higher altitudes is listed as a
|"Just Enough" home run - Means the ball
cleared the fence by less than 10 vertical feet, OR that it landed
less than one fence height past the fence. These are the ones that
barely made it over the fence.
|"No Doubt" home run - Means the ball cleared
the fence by at least 20 vertical feet AND landed at least 50 feet
past the fence. These are the really deep blasts.
|"Plenty" home run - Everything else, except
for the 2 above Homerun types
|Lucky Homer - A home run that would not have
cleared the fence if it has been struck on a 70-degree, calm day.
|# Parks - This value indicates the number of
MLB ballparks, out of 30, in which the ball in question would have
been a home run, if the ball had been struck in weather conditions
of 70 degrees and no wind. Really long home runs could achieve a
value of 30, while a particularly weak home run could achieve a
value as low as zero if it only made it over the fence in the park
in which it was struck due to "help" from wind and/or temperature.
The average value for "# Parks" in 2011 was about 23.