User's Guide and Reference

Properties of geometries and associated functions

This section describes geometries' properties and the spatial functions that are associated with these properties. The section begins with core properties:

• What class a geometry belongs to
• X and Y coordinates

This section also explains:

• Z coordinates
• Measures
• A geometry's interior, boundary, and exterior
• The quality of being simple or non-simple
• The quality of being empty or not empty
• A geometry's envelope
• Dimension
• The identifier of a geometry's associated spatial reference system