What is a vertex in GIS terminology?

In GIS terminology, a vertex is defined as a point that specifies the shape of a polygon or line. Vertices serve as critical elements in the representation of geometries; they define the corners or angles of polygons and the endpoints of line features. When mapping spatial data, each vertex contributes to forming the outline of a feature, whether it be a complex polygon representing land use or a linear feature such as a road or river.

This concept is essential for understanding how digital representations of spatial features are constructed and manipulated within GIS software. For example, when creating or editing shapes in mapping applications, the vertices can be adjusted to modify the geometry according to analytical or design needs.

Recognizing the role of vertices helps in various GIS operations, including spatial analysis, feature editing, and cartographic design, making them foundational in the field of geographic information systems.