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)