ST_Intersection

Introduction: Return the intersection geometry of A and B

Format: ST_Intersection (A:geometry, B:geometry)

Return type: Geometry

!!!note If you encounter a TopologyException with the message “found non-noded intersection”, this is a known issue with the legacy overlay implementation in JTS. The OverlayNG algorithm resolves this. To enable it, add the following JVM flag:

```
-Djts.overlay=ng
```

SQL example:

SELECT ST_Intersection(polygondf.countyshape, polygondf.countyshape)
FROM polygondf