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ST_LineExtend

ST_LineExtend
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Name

ST_LineExtend — Returns a line with the last and first segments extended the specified distance(s).

Synopsis

geometry ST_LineExtend ( geometry line , float distance_forward , float distance_backward=0.0 ) ;

Description

Returns a line with the last and first segments extended the specified distance(s). Distance of zero carries out no extension. Only non-negative distances are allowed. The first (and last) two distinct points in a line are used to determine the direction of projection, duplicate points are ignored.

Availability: 3.4.0

Example: Extends a line 5 units forward and 6 units backward 

SELECT ST_AsText(ST_LineExtend('LINESTRING(0 0, 0 10)'::geometry, 5, 6));
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LINESTRING(0 -6,0 0,0 10,0 15)

See Also

ST_LocateAlong , ST_Project

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