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In American football and Canadian football, the hash marks are two rows of lines near the middle of the field that are parallel to the side lines.These small lines (4 in [10 cm] wide by 2 ft [61 cm] long) are used to mark the 1-yard sections between each of the 5-yard lines, which go from sideline to sideline.
Diagram of a modern American football field. Diagram of an early 20th century version of an American football field. The rectangular field of play used for American football games measures 100 yards (91.44 m) long between the goal lines, and 160 feet (48.8 m) (53.3 yards) wide. The field may be made of grass or artificial turf. In addition ...
The 1st and Ten line displays the yard line needed for a first down during an ESPN Sunday Night Football broadcast.. 1st & Ten is a computer system that augments televised coverage of American football by inserting graphical elements on the field of play as if they were physically present; the inserted element stays fixed within the coordinates of the playing field and obeys the visual rules ...
A football pitch or soccer field is the playing surface for the game of association football. Its dimensions and markings are defined by Law 1 of the Laws of the Game , "The Field of Play". [ 1 ] The pitch is typically made of natural turf or artificial turf , although amateur and recreational teams often play on dirt fields.
Gridiron football (/ ˈ ɡ r ɪ d aɪ. ər n / GRID-eye-ərn), [1] also known as North American football, [2] or in North America as simply football, is a family of team sports derived from rugby football (and football, by extension) primarily played in the United States and Canada.
Basic line marking machines for turf were available by the late 1800s. [1]: 40 They were originally developed for use on lawn tennis courts.[1]: 40 One of the first such machines, a wheel-to-wheel paint transfer device, was developed by F.H. Ayres and "would be instantly recognizable by users of many of today's machines, which work on the same principle".
Back in a New York office, and up in a stadium booth in Arizona, NFL officials questioned the call on the field. They scoured video for evidence. They watched one replay, then a second.
Using the user requirements as the design driver, the design of MOSS began during the summer of 1977. Once the design group, led by Carl Reed, agreed on the design, programming started. The development environment was a CDC mainframe running the Kronos operating system. Fortran IV was the development language. Graphics presentation and code ...