ST_Disjoint

Given two shapes A and B, ST_Disjoint(A, B) returns true if the shapes do not share any of the same space — that is, if no point in the set that comprises A is also a member of the set of points that make up B.

ST_Disjoint works on the following spatial data types:

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

“ does not make use of .

This function is the inverse of .

Examples

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 other than 4326 (as shown below).

True

In this example, “ returns true because:

• No Point in the set that comprises Polygon A is also a member of the set of points that make up Polygon B.

SELECT st_disjoint(st_geomfromtext('SRID=4326;POLYGON((-87.906471 43.038902, -95.992775 36.153980, -75.704722 36.076944, -87.906471 43.038902), (-87.623177 41.881832, -90.199402 38.627003, -82.446732 38.413651, -87.623177 41.881832))'), st_geomfromtext('SRID=4326;POLYGON((-87.356934 41.595161, -84.512016 39.103119, -86.529167 39.162222, -87.356934 41.595161))'));

  st_disjoint
---------------
     true

(1 row)

False

In this example, “ returns false because:

• Many Points in the set that comprises Polygon A are also members of the set of points that make up Polygon B.

SELECT st_disjoint(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_disjoint
---------------
     false
(1 row)

See also

• Introducing Distributed Spatial Data in CockroachDB (blog post)