ST_CROSSES
Syntax
ST_CROSSES(g1,g2)
Description
Returns 1
if geometry g1
spatially crosses geometry g2
. Returns NULL
if g1
is a Polygon or a MultiPolygon, or if g2
is a
Point or a MultiPoint. Otherwise, returns 0
.
The term spatially crosses denotes a spatial relation between two given geometries that has the following properties:
- The two geometries intersect
- Their intersection results in a geometry that has a dimension that is one less than the maximum dimension of the two given geometries
- Their intersection is not equal to either of the two given geometries
ST_CROSSES() uses object shapes, while CROSSES(), based on the original MySQL implementation, uses object bounding rectangles.
Examples
SET @g1 = ST_GEOMFROMTEXT('LINESTRING(174 149, 176 151)'); SET @g2 = ST_GEOMFROMTEXT('POLYGON((175 150, 20 40, 50 60, 125 100, 175 150))'); SELECT ST_CROSSES(@g1,@g2); +---------------------+ | ST_CROSSES(@g1,@g2) | +---------------------+ | 1 | +---------------------+ SET @g1 = ST_GEOMFROMTEXT('LINESTRING(176 149, 176 151)'); SELECT ST_CROSSES(@g1,@g2); +---------------------+ | ST_CROSSES(@g1,@g2) | +---------------------+ | 0 | +---------------------+
Content reproduced on this site is the property of its respective owners,
and this content is not reviewed in advance by MariaDB. The views, information and opinions
expressed by this content do not necessarily represent those of MariaDB or any other party.