11.4.2 The OpenGIS Geometry Model

11.4.2.1 The Geometry Class Hierarchy

11.4.2.2 Geometry Class

11.4.2.3 Point Class

11.4.2.4 Curve Class

11.4.2.5 LineString Class

11.4.2.6 Surface Class

11.4.2.7 Polygon Class

11.4.2.8 GeometryCollection Class

11.4.2.9 MultiPoint Class

11.4.2.10 MultiCurve Class

11.4.2.11 MultiLineString Class

11.4.2.12 MultiSurface Class

11.4.2.13 MultiPolygon Class

The set of geometry types proposed by OGC's SQL with Geometry Types environment is based on the OpenGIS Geometry Model. In this model, each geometric object has the following general properties:

• It is associated with a spatial reference system, which describes the coordinate space in which the object is defined.

• It belongs to some geometry class.