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\$1Covers
<a name="ST_Covers-function"></a>

ST\$1Covers returns true if the 2D projection of the first input geometry covers the 2D projection of the second input geometry. Geometry `A` covers geometry `B` if both are nonempty and every point in `B` is a point in `A`. 

ST\$1Covers(`A`, `B`) is equivalent to ST\$1CoveredBy(`B`, `A`). 

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

```
ST_Covers(geom1, geom2)
```

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

 *geom1*   
A value of data type `GEOMETRY` or an expression that evaluates to a `GEOMETRY` type. 

 *geom2*   
A value of data type `GEOMETRY` or an expression that evaluates to a `GEOMETRY` type. This value is compared with *geom1* to determine if it covers *geom1*. 

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

`BOOLEAN`

If *geom1* or *geom2* is null, then null is returned. 

If *geom1* and *geom2* don't have the same value for the spatial reference system identifier (SRID), then an error is returned. 

If *geom1* or *geom2* is a geometry collection, then an error is returned. 

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

The following SQL checks if the first polygon covers the second polygon. 

```
SELECT ST_Covers(ST_GeomFromText('POLYGON((0 2,1 1,0 -1,0 2))'), ST_GeomFromText('POLYGON((-1 3,2 1,0 -3,-1 3))'));
```

```
st_covers
-----------
 false
```