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GRASS Help System |
line - A basic geographic element, defined by an ordered set of points, that describes the position and shape of a linear feature on a map. In GRASS usage, the term line does not necessarily refer to a straight line, but merely to a series of arcs (vectors) forming the perimeter of a linear feature (e.g., stream or railroad). Arcs that form linear features are sometimes called lines, and arcs that outline areas are called area edges or area lines.