docs/api/sql/Overlay-Functions/ST_Intersection.md

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# ST_Intersection

Introduction: Return the intersection geometry of A and B

![ST_Intersection](../../../image/ST_Intersection/ST_Intersection.svg "ST_Intersection")

Format: `ST_Intersection (A: Geometry, B: Geometry)`

Return type: `Geometry`

Since: `v1.0.0`

!!!note
    If you encounter a `TopologyException` with the message "found non-noded intersection", try enabling the OverlayNG algorithm by setting the following Spark configuration:

    ```
    spark.driver.extraJavaOptions=-Djts.overlay=ng
    spark.executor.extraJavaOptions=-Djts.overlay=ng
    ```

    The OverlayNG algorithm is more robust than the legacy overlay implementation in JTS and handles many edge cases that would otherwise cause errors.

SQL Example

```sql
SELECT ST_Intersection(
    ST_GeomFromWKT("POLYGON((1 1, 8 1, 8 8, 1 8, 1 1))"),
    ST_GeomFromWKT("POLYGON((2 2, 9 2, 9 9, 2 9, 2 2))")
    )
```

Output:

```
POLYGON ((2 8, 8 8, 8 2, 2 2, 2 8))
```