Linear features are represented in ArcInfo by arcs or by the route-system feature class. Map extent is specified in the coordinate system of the coverage or other geographic data set used. The process of selecting information from a GIS by asking spatial or logical questions of the geographic data. Once selected, additional operations can be performed, such as drawing them, listing their attributes or summarizing attribute values. The reduction needed to display a representation of the Earth's surface on a map.
Map units can be inches, centimeters, feet, meters, or decimal degrees.
See also zoom. A coverage feature class used to represent point features or to identify polygons. It is not possible to have point and polygon features in the same coverage. When representing point features, the x,y location of the label point describes the location of the feature. When identifying polygons, the label point can be located anywhere within the polygon.