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\$1Crosses
<a name="ST_Crosses-function"></a>

ST\$1Crosses returns true if the 2D projections of the two input geometries cross each other. 

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

```
ST_Crosses(geom1, geom2)
```

## Arguments
<a name="ST_Crosses-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. 

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

`BOOLEAN`

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

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

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

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

The following SQL checks if the first polygon crosses the second multipoint. In this example, the multipoint intersects both the interior and exterior of the polygon, which is why ST\$1Crosses returns true.

```
SELECT ST_Crosses (ST_GeomFromText('polygon((0 0,10 0,10 10,0 10,0 0))'), ST_GeomFromText('multipoint(5 5,0 0,-1 -1)'));
```

```
st_crosses              
-------------
 true
```

The following SQL checks if the first polygon crosses the second multipoint. In this example, the multipoint intersects the exterior of the polygon but not its interior, which is why ST\$1Crosses returns false.

```
SELECT ST_Crosses (ST_GeomFromText('polygon((0 0,10 0,10 10,0 10,0 0))'), ST_GeomFromText('multipoint(0 0,-1 -1)'));
```

```
st_crosses              
-------------
 false
```