ARC/INFO coverage feature classes

In ARC/INFO coverages, features are stored as vector data and their attributes are stored in tables known as attribute tables. Each class of features stored in a coverage has its own attribute table. Attribute tables contain one record for each feature of that class in the coverage.

Points
Points represent features found at discrete locations, such as telephone poles, wells and mountain peaks.

Arcs
Arcs represent linear features such as streams, streets and contours.

Polygons
Polygons represent areas enclosed by specific boundaries, such as countries, states, land parcels and soil types. The boundaries of polygons in a coverage can be displayed irrespective of whether the coverage contains arc features.

Label points
Label points are points inside polygons that have the same attributes as the polygons. One way to use label points is to symbolize polygons using different point symbols according to their attributes.

Nodes
Nodes are the endpoints of the arcs making up arc features and polygon features. A node occurs at the point where two or more arcs meet and at each end of a dangling (unconnected) arc.

Routes
Routes are linear features composed of one or more arcs or parts of an arc. For example, a highway may be composed of a number of connected arcs. Sets of routes with similar attributes are stored as a subclass. A coverage can therefore contain several different route systems. For example, a street coverage may contain bus routes and delivery routes.

Regions
Regions are polygon features composed of one or more polygons. For example, when the state of Hawaii is stored as a region you can work with it as a single feature even though it is made up of several polygons. The polygons in a region may overlap. A coverage can contain several different subclasses of regions.

Annotation
Annotation is text stored in a coverage to label the features it contains. Annotation stores text strings, text characteristics and shape points used to position each text string.


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