ST_Intersects

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Given two shapes A and B, ST_Intersects(A, B) returns true if the shapes share any of the same space -- that is, if any point in the set that comprises A is also a member of the set of points that make up B.

ST_Intersects works on the following data types:

Note:

ST_Intersects will attempt to use any available spatial index to speed up its operation. Use the prefixed variant _ST_Intersects if you do not want any spatial indexes to be used.

Note:

This function is the inverse of ST_Disjoint.

Examples

Note:

The screenshots in these examples were generated using geojson.io, but they are designed to showcase the shapes, not the map. Representing GEOMETRY data in GeoJSON can lead to unexpected results if using geometries with SRIDs other than 4326 (as shown below).

True

In this example, ST_Intersects returns true because:

The shapes share some of the same space -- that is, there are Points in the set that comprises Polygon A that are also members of Polygon B.

SELECT st_intersects(st_geomfromtext('SRID=4326;POLYGON((-87.906471 43.038902, -95.992775 36.153980, -75.704722 36.076944, -87.906471 43.038902))'), st_geomfromtext('SRID=4326;POLYGON((-84.191605 39.758949, -75.165222 39.952583, -78.878738 42.880230, -84.191605 39.758949))'));

 st_intersects
---------------
     true

(1 row)

ST_Intersects - true

False

In this example, ST_Intersects returns false because:

The shapes do not share any of the same space -- that is, there are no Points in the set that comprises Polygon A that are also members of Polygon B.

SELECT st_intersects(st_geomfromtext('SRID=4326;POLYGON((-87.906471 43.038902, -95.992775 36.153980, -75.704722 36.076944, -87.906471 43.038902))'), st_geomfromtext('SRID=4326;POLYGON((-79.995888 40.440624,-74.666728 40.358244, -76.5 42.443333, -79.995888 40.440624))'));

 st_intersects
---------------
     false
(1 row)

ST_Intersects - false

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ST_Intersects

Examples

True

False

See also