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16.5.2.1 General Geometry Functions »
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16.5.2. Geometry Functions

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16.5.2.1. General Geometry Functions
16.5.2.2. Point Functions
16.5.2.3. LineString Functions
16.5.2.4. MultiLineString Functions
16.5.2.5. Polygon Functions
16.5.2.6. MultiPolygon Functions
16.5.2.7. GeometryCollection Functions

Each function that belongs to this group takes a geometry value as its argument and returns some quantitative or qualitative property of the geometry. Some functions restrict their argument type. Such functions return NULL if the argument is of an incorrect geometry type. For example, Area() returns NULL if the object type is neither Polygon nor MultiPolygon.