Name
ST_Touches — Tests if two geometries have at least one point in common, but their interiors do not intersect
Synopsis
boolean ST_Touches(geometry A, geometry B);
설명
Returns TRUE if A and B intersect, but their interiors do not intersect. Equivalently, A and B have at least one point in common, and the common points lie in at least one boundary. For Point/Point inputs the relationship is always FALSE, since points do not have a boundary.
In mathematical terms: ST_Touches(A, B) ⇔ (Int(A) ⋂ Int(B) = ∅) ∧ (A ⋂ B ≠ ∅)
This relationship holds if the DE-9IM Intersection Matrix for the two geometries matches one of:
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FT*******
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F**T*****
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F***T****
![[Note]](../images/note.png)
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This function automatically includes a bounding box comparison that makes use of any spatial indexes that are available on the geometries. To avoid using an index, use |
![[Important]](../images/important.png)
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Enhanced: 3.0.0 enabled support for |
This method implements the OGC Simple Features Implementation Specification for SQL 1.1. s2.1.1.2 // s2.1.13.3
This method implements the SQL/MM specification. SQL-MM 3: 5.1.28
예시
The ST_Touches predicate returns TRUE in the following examples.
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SELECT ST_Touches('LINESTRING(0 0, 1 1, 0 2)'::geometry, 'POINT(1 1)'::geometry);
st_touches
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f
(1 row)
SELECT ST_Touches('LINESTRING(0 0, 1 1, 0 2)'::geometry, 'POINT(0 2)'::geometry);
st_touches
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t
(1 row)