Data Types


Annotation
Descriptive text on a drawing or map associated with identifying or explaining graphics entities shown.
Line
1. A set of ordered coordinates that represents the shape of geographic features too narrow to be displayed as an area at the given scale (e.g., contours, street center lines, or streams), or linear features with no area (e.g., state and county boundary lines). A line begins and ends with a node.
2. A line on a map (e.g., a neatline).
Point
1. A single x,y coordinate that represents a feature too small to be displayed as a line or area; for example, the location of a mountain peak or a building location on a small-scale map.
2. Some GISs also use a point to identify the interior of a polygon.
Polygon
A multisided figure that represents an area on a map. An areal feature defined by the arcs that make up its boundary. Polygons have attributes that describe the geographic features they represent.

source: Beyond Mapping: concepts, Algorithms, and Issues in GIS

source: Understanding GIS - the Arc/Info method


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