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Documentation
/ SQL
/ Functions
Geometry Functions
This section describes the functions for for examining and manipulating GEOMETRY values.
Note: The
spatialextension provides additional functions for working withGEOMETRYvalues, which are documented in the Spatial Functions section.
Geometry Operators
The table below lists the operators that can be used with GEOMETRY values.
| Operator | Description | Example | Result |
|---|---|---|---|
&& |
Returns true if the geometries bounding boxes intersect. Equivalent to ST_IntersectsExtent. |
'POINT(5 5)'::GEOMETRY && 'LINESTRING(0 0, 10 20)'::GEOMETRY |
true |
Built-in Geometry Functions
| Name | Description |
|---|---|
ST_GeomFromWKB |
Creates a geometry from Well-Known Binary (WKB) representation |
ST_AsWKB |
Returns the Well-Known Binary (WKB) representation of the geometry |
ST_AsWKT |
Returns the Well-Known Text (WKT) representation of the geometry |
ST_Intersects_Extent |
Returns true if the geometries bounding boxes intersect |
ST_CRS |
Returns the Coordinate Reference System (CRS) identifier of the geometry |
ST_SetCRS |
Sets the Coordinate Reference System (CRS) identifier of the geometry |
ST_GeomFromWKB function
| Description | Creates a geometry from Well-Known Binary (WKB) representation |
| Example | ST_GeomFromWKB('\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\xF0?\x00\x00\x00\x00\x00\x00\x00@') |
| Result | POINT(1 2) |
ST_AsWKB function
| Description | Returns the Well-Known Binary (WKB) representation of the geometry |
| Example | ST_AsWKB('POINT(1 2)::GEOMETRY') |
| Result | \x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\xF0?\x00\x00\x00\x00\x00\x00\x00@ |
| Alias | ST_AsBinary |
ST_AsWKT function
| Description | Returns the Well-Known Text (WKT) representation of the geometry |
| Example | ST_AsText('POINT(1 2)'::GEOMETRY) |
| Result | POINT (1 2) |
| Alias | ST_AsText |
ST_Intersects_Extent function
| Description | Returns true if the geometries bounding boxes intersect |
| Example | 'POINT(5 5)'::GEOMETRY && 'LINESTRING(0 0, 10 20)'::GEOMETRY |
| Result | true |
| Alias | && |
ST_CRS function
| Description | Returns the Coordinate Reference System (CRS) identifier of the geometry |
| Example | ST_CRS('POINT(1 2)'::GEOMETRY('OGC:CRS84')) |
| Result | OGC:CRS84 |
ST_SetCRS function
| Description | Sets the Coordinate Reference System (CRS) identifier of the geometry |
| Example | typeof(ST_SetCRS('POINT(1 2)'::GEOMETRY, 'OGC:CRS84')) |
| Result | GEOMETRY('OGC:CRS84') |
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