![]() Vector graphics systems were retired from the U.S. Vector graphic displays were first used in 1958 by the US SAGE air defense system. Since vector display devices can define a line by dealing with just two points (that is, the coordinates of each end of the line), the device can reduce the total amount of data it must deal with by organizing the image in terms of pairs of points. Vector-based devices, such as the vector CRT and the pen plotter, directly control a drawing mechanism to produce geometric shapes. Main article: Vector monitor A free software Asteroids-like video game played on a vector monitor ![]() If a dataset stored in one vector file format is converted to another file format that supports all the primitive objects used in that particular image, then the conversion can be lossless. In some Vector data, especially in GIS, information about topological relationships between objects may be represented in the data model, such as tracking the connections between road segments in a transport network. In systems in which shapes represent real-world features, such as GIS and BIM, a variety of attributes of each represented feature can be stored, such as name, age, size, and so on. The most common are visual characteristics, such as color, line weight, or dash pattern. In many vector datasets, each shape can be combined with a set of properties.
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