ST_Force3DZ

Introduction: Forces the geometry into a 3-dimensional model so that all output representations will have X, Y and Z coordinates. An optionally given zValue is tacked onto the geometry if the geometry is 2-dimensional. Default value of zValue is 0.0 If the given geometry is 3-dimensional, no change is performed on it. If the given geometry is empty, no change is performed on it. This function is an alias for ST_Force3D.

Note

Example output is after calling ST_AsText() on returned geometry, which adds Z for in the WKT for 3D geometries

Format: ST_Force3DZ(geometry: Geometry, zValue: Double)

Since: v1.6.1

SQL Example

SELECT ST_AsText(ST_Force3DZ(ST_GeomFromText('POLYGON((0 0 2,0 5 2,5 0 2,0 0 2),(1 1 2,3 1 2,1 3 2,1 1 2))'), 2.3))

Output:

POLYGON Z((0 0 2, 0 5 2, 5 0 2, 0 0 2), (1 1 2, 3 1 2, 1 3 2, 1 1 2))

SQL Example

SELECT ST_AsText(ST_Force3DZ(ST_GeomFromText('LINESTRING(0 1,1 0,2 0)'), 2.3))

Output:

LINESTRING Z(0 1 2.3, 1 0 2.3, 2 0 2.3)