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This function scales the input geometry (geometry) to a new size. It does this by multiplying the coordinates of the input geometry with corresponding values from another geometry (factor) representing the scaling factors. To scale the geometry relative to a point other than the true origin (e.g., scaling a polygon in place using its centroid), you can use the three-geometry variant of this function. This variant requires an additional geometry (origin) representing the “false origin” for the scaling operation. If no origin is provided, the scaling occurs relative to the true origin, with all coordinates of the input geometry simply multiplied by the corresponding scale factors.
This function is designed for scaling 2D geometries. While it currently doesn’t support scaling the Z and M coordinates, it preserves these values during the scaling operation.
ST_ScaleGeom

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Signatures

ST_ScaleGeom(geometry: Geometry, factor: Geometry, origin: Geometry)

ST_ScaleGeom(geometry: Geometry, factor: Geometry)

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Parameters

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geometry
Geometry
required
The input geometry.
​
factor
Geometry
required
The factor value.
​
origin
Geometry
The origin value.

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Return type

The resulting geometry.

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Examples

SELECT ST_Scale(
        ST_GeomFromWKT('POLYGON ((0 0, 0 1.5, 1.5 1.5, 1.5 0, 0 0))'),
       ST_Point(3, 2)
)

POLYGON ((0 0, 0 3, 4.5 3, 4.5 0, 0 0))

SELECT ST_Scale(
        ST_GeomFromWKT('POLYGON ((0 0, 0 1.5, 1.5 1.5, 1.5 0, 0 0))'),
       ST_Point(3, 2), ST_Point(1, 2)
)

POLYGON ((-2 -2, -2 1, 2.5 1, 2.5 -2, -2 -2))