<P> The game is controlled by the officials consisting of the referee (referred to as crew chief in the NBA), one or two umpires (referred to as referees in the NBA) and the table officials . For college, the NBA, and many high schools, there are a total of three referees on the court . The table officials are responsible for keeping track of each teams scoring, timekeeping, individual and team fouls, player substitutions, team possession arrow, and the shot clock . </P> <P> The only essential equipment in a basketball game is the ball and the court: a flat, rectangular surface with baskets at opposite ends . Competitive levels require the use of more equipment such as clocks, score sheets, scoreboard (s), alternating possession arrows, and whistle - operated stop - clock systems . </P> <P> A regulation basketball court in international games is 91.9 feet (28.0 meters) long and 49.2 feet (15 meters) wide . In the NBA and NCAA the court is 94 by 50 feet (29 by 15 meters). Most courts have wood flooring, usually constructed from maple planks running in the same direction as the longer court dimension . The name and logo of the home team is usually painted on or around the center circle . </P> <P> The basket is a steel rim 18 inches (46 cm) diameter with an attached net affixed to a backboard that measures 6 by 3.5 feet (1.8 by 1.1 meters) and one basket is at each end of the court . The white outlined box on the backboard is 18 inches (46 cm) high and 2 feet (61 cm) wide . At almost all levels of competition, the top of the rim is exactly 10 feet (3.05 meters) above the court and 4 feet (1.22 meters) inside the baseline . While variation is possible in the dimensions of the court and backboard, it is considered important for the basket to be of the correct height--a rim that is off by just a few inches can have an adverse effect on shooting . </P>

What is the length of an nba basketball court
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