Amazon Redshift will no longer support the use of Python UDFs after June 30, 2026. We will start enforcing it in phases. For more information on the details of Python end of life and migration options, 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/) that was published on June 30, 2025. 

# ST\_GeomFromWKB
<a name="ST_GeomFromWKB-function"></a>

ST\_GeomFromWKB constructs a geometry object from a hexadecimal well-known binary (WKB) representation of an input geometry. 

ST\_GeomFromWKB accepts 3DZ, 3DM, and 4D geometries written in WKB hexadecimal format.

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

```
ST_GeomFromWKB(wkb_string)
```

```
ST_GeomFromWKB(wkb_string, srid)
```

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

 *wkb\_string*   
A value of data type `VARCHAR` that is a hexadecimal WKB representation of a geometry.

 *srid*   
A value of data type `INTEGER` that is a spatial reference identifier (SRID). If an SRID value is provided, the returned geometry has this SRID value. Otherwise, the SRID value of the returned geometry is set to 0.

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

`GEOMETRY`

If *wkb\_string* or *srid* is null, then null is returned. 

If *srid* is negative, then null is returned. 

If *wkb\_string* is not valid, then an error is returned. 

If *srid* is not valid, then an error is returned. 

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

The following SQL constructs a polygon from a WKB value and returns the WKT representation of a polygon. 

```
SELECT ST_AsText(ST_GeomFromWKB('01030000000100000005000000000000000000000000000000000000000000000000000000000000000000F03F000000000000F03F000000000000F03F000000000000F03F000000000000000000000000000000000000000000000000'));            
```

```
 st_astext
--------------------------------
 POLYGON((0 0,0 1,1 1,1 0,0 0))
```