ST_TOUCHES
Syntax
ST_TOUCHES(g1,g2)
Description
Returns 1
or 0
to indicate whether geometry g1
spatially touches geometry g2
. Two geometries spatially touch if the interiors of the geometries do not intersect,
but the boundary of one of the geometries intersects either the boundary or the
interior of the other.
ST_TOUCHES() uses object shapes, while TOUCHES(), based on the original MySQL implementation, uses object bounding rectangles.
Examples
SET @g1 = ST_GEOMFROMTEXT('POINT(2 0)'); SET @g2 = ST_GEOMFROMTEXT('LINESTRING(2 0, 0 2)'); SELECT ST_TOUCHES(@g1,@g2); +---------------------+ | ST_TOUCHES(@g1,@g2) | +---------------------+ | 1 | +---------------------+ SET @g1 = ST_GEOMFROMTEXT('POINT(2 1)'); SELECT ST_TOUCHES(@g1,@g2); +---------------------+ | ST_TOUCHES(@g1,@g2) | +---------------------+ | 0 | +---------------------+
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