来自 PostGIS 的文档
http://postgis.net/docs/ST_Intersects.html
如果几何或地理共享空间的任何部分,则它们相交。Overlaps, Touches, Within 都暗示着空间的交叉。如果上述任何一个返回 true,则几何图形也在空间上相交。
http://postgis.net/docs/ST_Overlaps.html
如果几何“空间重叠”,则返回 TRUE。我们的意思是它们相交,但一个并不完全包含另一个。
区别在于:如果两个几何图形 100% 重叠,则它们不再重叠。
这是一个 POSTGIS 示例:
SELECT ST_Overlaps(a,b) As a_overlap_b, ST_Intersects(a, b) As a_intersects_b, ST_Contains(b, a) As b_contains_a
FROM (SELECT
ST_Polygon(ST_GeomFromText('LINESTRING(1 1,3 1,3 3,1 1)'), 4326) As a,
ST_Polygon(ST_GeomFromText('LINESTRING(1 1,3 1,3 3,1 1)'), 4326) As b)
As foo;
-- INTERSECT is TRUE, OVERLAP is FALSE because B equals A
SELECT ST_Overlaps(a,b) As a_overlap_b, ST_Intersects(a, b) As a_intersects_b, ST_Contains(b, a) As b_contains_a
FROM (SELECT
ST_Polygon(ST_GeomFromText('LINESTRING(1 1,3 1,3 3,1 1)'), 4326) As a,
ST_Polygon(ST_GeomFromText('LINESTRING(1 1,4 1,4 4,1 1)'), 4326) As b)
As foo;
-- INTERSECT is TRUE, OVERLAP is FALSE because B contains A
SELECT ST_Overlaps(a,b) As a_overlap_b, ST_Intersects(a, b) As a_intersects_b, ST_Contains(b, a) As b_contains_a
FROM (SELECT
ST_Polygon(ST_GeomFromText('LINESTRING(0 0,2 0,2 2,0 0)'), 4326) As a,
ST_Polygon(ST_GeomFromText('LINESTRING(1 1,3 1,3 3,1 1)'), 4326) As b)
As foo;
-- INTERSECT is TRUE, OVERLAP is TRUE because not all of A intersects B and not all of B intersects A