How are polygon features characterized in GIS?

Polygon features in Geographic Information Systems (GIS) are characterized as closed multi-sided figures. This means that a polygon is defined by a series of connected points (vertices) that create a shape with distinct boundaries. Polygons have an area and are used to represent various real-world objects, such as lakes, parks, or political boundaries.

Each vertex of a polygon contributes to its shape, and by connecting these points, a closed figure is formed, ensuring that the start and end points meet. This unique definition allows polygons to include any number of sides, as long as they are closed and non-intersecting.

In contrast, a single coordinate represents only a point rather than an area; overlapping grid cells would not accurately define a polygon's shape since they are based on a raster model; and straight lines connecting points alone do not guarantee the closure of the shape unless specified as part of a polygon structure, as lines could describe a variety of figures, including open shapes. Therefore, the characterization of polygon features as closed multi-sided figures is essential for their application in GIS.