ST_Intersects — Tests if two geometries intersect (they have at least one point in common)
true if two geometries intersect.
Geometries intersect if they have any point in common.
For geography, a distance tolerance of 0.00001 meters is used (so points that are very close are considered to intersect).
In mathematical terms: ST_Intersects(A, B) ⇔ A ⋂ B ≠ ∅
Geometries intersect if their DE-9IM Intersection Matrix matches one of:
Spatial intersection is implied by all the other spatial relationship tests, except ST_Disjoint, which tests that geometries do NOT intersect.
This function automatically includes a bounding box comparison that makes use of any spatial indexes that are available on the geometries.
Changed: 3.0.0 SFCGAL version removed and native support for 2D TINS added.
Enhanced: 2.5.0 Supports GEOMETRYCOLLECTION.
Enhanced: 2.3.0 Enhancement to PIP short-circuit extended to support MultiPoints with few points. Prior versions only supported point in polygon.
Performed by the GEOS module (for geometry), geography is native
Availability: 1.5 support for geography was introduced.
For geography, this function has a distance tolerance of about 0.00001 meters and uses the sphere rather than spheroid calculation.
NOTE: this is the "allowable" version that returns a boolean, not an integer.
This method implements the OGC Simple Features Implementation Specification for SQL 1.1.
s184.108.40.206 //s220.127.116.11 - ST_Intersects(g1, g2 ) --> Not (ST_Disjoint(g1, g2 ))
This method implements the SQL/MM specification.
SQL-MM 3: 5.1.27
This method supports Circular Strings and Curves.
This function supports Triangles and Triangulated Irregular Network Surfaces (TIN).
SELECT ST_Intersects('POINT(0 0)'::geometry, 'LINESTRING ( 2 0, 0 2 )'::geometry); st_intersects --------------- f (1 row) SELECT ST_Intersects('POINT(0 0)'::geometry, 'LINESTRING ( 0 0, 0 2 )'::geometry); st_intersects --------------- t (1 row) -- Look up in table. Make sure table has a GiST index on geometry column for faster lookup. SELECT id, name FROM cities WHERE ST_Intersects(geom, 'SRID=4326;POLYGON((28 53,27.707 52.293,27 52,26.293 52.293,26 53,26.293 53.707,27 54,27.707 53.707,28 53))'); id | name ----+------- 2 | Minsk (1 row)
SELECT ST_Intersects( 'SRID=4326;LINESTRING(-43.23456 72.4567,-43.23456 72.4568)'::geography, 'SRID=4326;POINT(-43.23456 72.4567772)'::geography ); st_intersects --------------- t