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11.13.2.1 The Geometry Class Hierarchy »
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11.13.2. The OpenGIS Geometry Model

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11.13.2.1. The Geometry Class Hierarchy
11.13.2.2. Class Geometry
11.13.2.3. Class Point
11.13.2.4. Class Curve
11.13.2.5. Class LineString
11.13.2.6. Class Surface
11.13.2.7. Class Polygon
11.13.2.8. Class GeometryCollection
11.13.2.9. Class MultiPoint
11.13.2.10. Class MultiCurve
11.13.2.11. Class MultiLineString
11.13.2.12. Class MultiSurface
11.13.2.13. Class MultiPolygon

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.