\begin{table}[H]
\centering
\caption{Description of optional center-of-mass tracking fields in the CDF that would be recorded once per frame. Any description ending with a $^\star$ is repeated once per person (e.g., player, referee) per frame. Note that \{i\} is used as an index for the items in a list. Any type ending with a $^\ddagger$ may be null when the subject is occluded, off-camera or otherwise not captured in that frame.}
\label{tab:cdf-com-tracking-optional}
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\begin{tabular}{lp{2.5cm}p{7cm}l}
\hline
Root & Field & Description & Type \\ \hline
teams/\{home\text{\textbar}away\}/players/\{i\} & lat & latitude of the player's position if the data is collected by GNSS or GPS $^\star$ & Float \\
teams/\{home\text{\textbar}away\}/players/\{i\} & long & longitude of the player's position if the data is collected by GNSS or GPS$^\star$ & Float \\
teams/\{home\text{\textbar}away\}/players/\{i\} & z & z location of the player on the pitch (m)$^\star$. See Paragraph~\ref{p:coords}. & Float / null$^\ddagger$ \\
teams/\{home\text{\textbar}away\}/players/\{i\} & dist & Distance covered by the player/ball in the current frame (m)$^\star$ & Float \\
teams/\{home\text{\textbar}away\}/players/\{i\} & acc & Acceleration of the player/ball (m/s\textsuperscript{2})$^\star$ & Float \\
teams/\{home\text{\textbar}away\}/players/\{i\} & vel & Speed of the player/ball (m/s)$^\star$ & Float \\
teams/\{home\text{\textbar}away\}/players/\{i\} & is\_visible & Denotes if a player was visible (in view of the camera) (true) or not (false)$^\star$ & Boolean \\
ball & status & Indicates if the ball is either in play (true) or out of play (false) & Boolean \\
ball & poss\_team\_id & Unique identifier of the team that currently possesses the ball & String \\
ball & poss\_status & Contextual description of the level of control (e.g., controlled, contested,...) & String \\
officials/\{i\} & id & Unique identifier for an official & String \\
officials/\{i\} & x & x location of the official on the pitch (m)$^\star$ & Float / null$^\ddagger$ \\
officials/\{i\} & y & y location of the official on the pitch (m)$^\star$ & Float / null$^\ddagger$ \\
officials/\{i\} & z & z location of the official on the pitch (m)$^\star$ & Float / null$^\ddagger$ \\
officials/\{i\} & vel & Speed of the official (m/s)$^\star$ & Float \\
officials/\{i\} & acc & Acceleration of the official (m/s\textsuperscript{2})$^\star$ & Float \\
officials/\{i\} & lat & Latitude of the official's position if the data is collected by GNSS or GPS$^\star$ & Float \\
officials/\{i\} & long & Longitude of the official's position if the data is collected by GNSS or GPS$^\star$ & Float \\
officials/\{i\} & is\_visible & Denotes if an official was visible (in view of the camera) (true) or not (false)$^\star$ & Boolean \\
\end{tabular}
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\end{table}