Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# ST\$1Force2D
<a name="ST_Force2D-function"></a>

ST\$1Force2D returns a 2D geometry of the input geometry. For 2D geometries, a copy of the input is returned. For 3DZ, 3DM, and 4D geometries, ST\$1Force2D projects the geometry to the xy-Cartesian plane. Empty points in the input geometry remain empty points in the output geometry.

## Syntax
<a name="ST_Force2D-function-syntax"></a>

```
ST_Force2D(geom)
```

## Arguments
<a name="ST_Force2D-function-arguments"></a>

 *geom*   
A value of data type `GEOMETRY` or an expression that evaluates to a `GEOMETRY` type. 

## Return type
<a name="ST_Force2D-function-return"></a>

`GEOMETRY`. 

The spatial reference system identifier (SRID) value of the returned geometry is the SRID value of the input geometry. 

If *geom* is null, then null is returned. 

If *geom* is empty, then an empty geometry is returned. 

## Examples
<a name="ST_Force2D-function-examples"></a>

The following SQL returns a 2D geometry from a 3DZ geometry. 

```
SELECT ST_AsEWKT(ST_Force2D(ST_GeomFromText('MULTIPOINT Z(0 1 2, EMPTY, 2 3 4, 5 6 7)')));
```

```
st_asewkt
-----------
  MULTIPOINT((0 1),EMPTY,(2 3),(5 6))
```