ST_ShortestLine
Name
ST_ShortestLine — Returns the 2D shortest line between two geometries
Synopsis
geometry
ST_ShortestLine
(
geometry
geom1
, geometry
geom2
)
;
geography
ST_ShortestLine
(
geography
geom1
, geography
geom2
, boolean
use_spheroid = true
)
;
Description
Returns the 2-dimensional shortest line between two geometries.
The line returned starts in
geom1
and ends in
geom2
.
If
geom1
and
geom2
intersect
the result is a line with start and end at an intersection point.
The length of the line is the same as
ST_Distance
returns for g1 and g2.
Enhanced: 3.4.0 - support for geography.
Availability: 1.5.0
Examples
Shortest line between Point and LineString
SELECT ST_AsText( ST_ShortestLine(
'POINT (160 40)',
'LINESTRING (10 30, 50 50, 30 110, 70 90, 180 140, 130 190)')
) As sline;
---------------------------------------------------------
LINESTRING(160 40,125.75342465753425 115.34246575342466)
Shortest line between Polygons
SELECT ST_AsText( ST_ShortestLine(
'POLYGON ((190 150, 20 10, 160 70, 190 150))',
ST_Buffer('POINT(80 160)', 30)
) ) AS llinewkt;
-----------------
LINESTRING(131.59149149528952 101.89887534906197,101.21320343559644 138.78679656440357)