11.5.2 The OpenGIS Geometry Model The Geometry Class Hierarchy Geometry Class Point Class Curve Class LineString Class Surface Class Polygon Class GeometryCollection Class MultiPoint Class MultiCurve Class MultiLineString Class MultiSurface Class 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: