A football pitch (also known as a football 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". The pitch is typically made of natural turf or artificial turf, although amateur and recreational teams often play on dirt fields. Artificial surfaces must be green in colour.
All line markings on the pitch form part of the area which they define. For example, a ball on or above the touchline is still on the field of play, and a foul committed over the line bounding the penalty area results in a penalty. Therefore, a ball must completely cross the touchline to be out of play, and a ball must wholly cross the goal line (between the goal posts) before a goal is scored; if any part of the ball is still on or above the line, the ball is still in play.
The field descriptions that apply to adult matches are described below. Because of the role of the British football associations in the history of the game, the dimensions of the field of play were originally formulated and expressed in imperial units. Since 1997, the Laws of the Game have preferred metric units, with imperial equivalents given only in brackets. Because the actual values have, in general, not changed since the early twentieth century, they tend to be round numbers in imperial units (for example the width of the goal, unchanged since 1863, is 8 yards or 7.32 metres). Use of the imperial values remains common, especially in the United Kingdom.
The pitch is rectangular in shape. The longer sides are called touchlines. The other opposing sides are called the goal lines. The two goal lines must be between 45 and 90 m (50 and 100 yd) wide, and be the same length. The two touchlines must be between 90 and 120 m (100 and 130 yd) long, and be the same length. All lines on the ground must be equally wide, not to exceed 12 cm (5 in). The corners of the pitch are marked by corner flags.
For international matches the field dimensions are more tightly constrained; the goal lines must be between 64 and 75m wide (70 and 82yds), and the touchlines must be between 100 and 110 m (110 and 120 yd) long.
Although the term goal line is often taken to mean only that part of the line between the goalposts, in fact it refers to the complete line at either end of the pitch, from one corner flag to the other. In contrast, the term byline (or by-line) is often used to refer to that portion of the goal line outside the goalposts. This term is commonly used in football commentaries and match descriptions, such as this example from a BBC match report: "Udeze gets to the left byline and his looping cross is cleared..."
Goals are placed at the centre of each goal-line. These consist of two upright posts placed equidistant from the corner flagposts, joined at the top by a horizontal crossbar. The inner edges of the posts must be 7.32 metres (8 yd) apart, and the lower edge of the crossbar must be 2.44 metres (8 ft) above the ground. ie the area that players have to shoot at is 17.86 sq. metres (192 sq. feet) . Nets are usually placed behind the goal, though are not required by the Laws.
Goalposts and crossbars must be white, and made of wood, metal or other approved material. Rules regarding the shape of goalposts and crossbars are somewhat more lenient, but they must conform to a shape that does not pose a threat to players. Since the beginning of football there have always been goalposts, but the crossbar was not invented until 1875, before which a string between the goalposts was used.
A goal is scored when the ball crosses the goal line between the goal-posts, even if a defending player last touched the ball before it crossed the goal line (see own goal). A goal may, however, be ruled illegal (and void by the referee) if the player who scored or a member of their team commits an offence under any of the laws between the time the ball was previously out of play and the goal being scored. It is also deemed void if a player on the opposing team commits an offence before the ball has passed the line, as in the case of fouls being committed, a penalty awarded but the ball continued on a path that caused it to cross the goal line.
The football goal size for a junior match goal is approximately half the size of an adult sized match goal.
History of football goals and netsEdit
Football goals were first described in England in the late 16th and early 17th centuries. In 1584 and 1602 respectively, John Norden and Richard Carew referred to "goals" in Cornish hurling. Carew described how goals were made: "they pitch two bushes in the ground, some eight or ten foote asunder; and directly against them, ten or twelue [twelve] score off, other twayne in like distance, which they terme their Goales". The first reference to scoring a goal is in John Day's play The Blind Beggar of Bethnal Green (performed circa 1600; published 1659). Similarly in a poem in 1613, Michael Drayton refers to "when the Ball to throw, And drive it to the Gole, in squadrons forth they goe". Solid crossbars were first introduced by the Sheffield Rules. Football nets were invented by Liverpool engineer John Brodie in 1891, and they were a necessary help for discussions about whether or not a goal had been scored.
Penalty and goal areasEdit
Two rectangular boxes are marked out on the pitch in front of each goal.
The goal area (colloquially the "six-yard box"), consists of the rectangle formed by the goal-line, two lines starting on the goal-line 5.5 metres (6 yd) from the goalposts and extending 5.5 metres (6 yd) into the pitch from the goal-line, and the line joining these, ie they are a rectangle 6yds by 20yds. Goal kicks and any free kick by the defending team may be taken from anywhere in this area. Indirect free kicks awarded to the attacking team within the goal area are taken from the point on the line parallel to the goal line (the "six-yard line") nearest where the infringement occurred; they cannot be taken any closer to the goal line. Similarly drop-balls that would otherwise occur closer to the goal line are taken on this line.
The penalty area (colloquially "the 18-yard box" or just "the box") is similarly formed by the goal-line and lines extending from it, but its lines start 16.5 metres (18 yd) from the goalposts and extend 16.5 metres (18 yd) into the field. ie this is a rectangle 44yds by 18 yds. This area has a number of functions, the most prominent being to denote where the goalkeeper may handle the ball and where a foul by a defender, usually punished by a direct free kick, becomes punishable by a penalty kick. Both the goal and penalty areas were formed as semicircles until 1902.
The penalty mark (colloquially "the penalty spot" or just "the spot") is 11 metres (12 yd) in front of the very centre of the goal: this is the point from where penalty kicks are taken.
The penalty arc (colloquially "the D") is marked from the outside edge of the penalty area, 9.15 metres (10 yd) from the penalty mark; this, along with the penalty area, marks an exclusion zone for all players other than the penalty kicker and defending goalkeeper during a penalty kick.
The centre circle is marked at 9.15 metres (10 yd) from the centre mark. Similar to the penalty arc, this indicates the minimum distance that opposing players must keep at kick-off; the ball itself is placed on the centre mark. During penalty shootouts all players other than the two goalkeepers and the current kicker are required to remain within this circle.
The half-way line divides the pitch in two. The half which a team defends is commonly referred to as being their half. Players must be within their own half at a kick-off and may not be penalised as being offside in their own half. The intersections between the half-way line and the touchline can be indicated with flags like those marking the corners – the laws consider this as an optional feature.
The arcs in the corners denote the area (within 1 yard of the corner) in which the ball has to be placed for corner kicks; opposition players have to be 9.15 m (10 yd) away during a corner, and there may be optional lines off-pitch 9.15 metres (10 yards) away from the corner arc on the goal- and touch-lines to help gauge these distances.
Grass is the normal surface of play, although artificial turf may sometimes be used especially in locations where maintenance of grass may be difficult due to inclement weather. This may include areas where it is very wet, causing the grass to deteriorate rapidly; where it is very dry, causing the grass to die; and where the turf is under heavy use. Artificial turf pitches are also increasingly common on the Scandinavian Peninsula, due to the amount of snow during the winter months. The strain put on grass pitches by the cold climate and subsequent snow clearing has necessitated the installation of artificial turf in the stadia of many top-tier clubs in Norway, Sweden and Finland. The latest artificial surfaces use rubber crumbs, as opposed to the previous system of sand infill. Some leagues and football associations have specifically prohibited artificial surfaces due to injury concerns and require teams' home stadia to have grass pitches. All artificial turf must be green and also meet the requirements specified in the FIFA Quality Concept for Football Turf.
Football can also be played on a dirt field. In most parts of the world, dirt is only used for casual recreational play.
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