## Name

ST_3DLongestLine — Returns the 3D longest line between two geometries

## Synopsis

`geometry ST_3DLongestLine(`geometry g1, geometry g2`)`;

## Descripción

Returns the 3-dimensional longest line between two geometries. The function returns the first longest line if more than one. The line returned starts in g1 and ends in g2. The 3D length of the line is equal to the distance returned by ST_3DMaxDistance.

 linestring and point -- both 3d and 2d longest line ```SELECT ST_AsEWKT(ST_3DLongestLine(line,pt)) AS lol3d_line_pt, ST_AsEWKT(ST_LongestLine(line,pt)) As lol2d_line_pt FROM (SELECT 'POINT(100 100 30)'::geometry As pt, 'LINESTRING (20 80 20, 98 190 1, 110 180 3, 50 75 1000)'::geometry As line ) As foo; lol3d_line_pt | lol2d_line_pt -----------------------------------+---------------------------- LINESTRING(50 75 1000,100 100 30) | LINESTRING(98 190,100 100) ``` linestring and multipoint -- both 3d and 2d longest line ```SELECT ST_AsEWKT(ST_3DLongestLine(line,pt)) AS lol3d_line_pt, ST_AsEWKT(ST_LongestLine(line,pt)) As lol2d_line_pt FROM (SELECT 'MULTIPOINT(100 100 30, 50 74 1000)'::geometry As pt, 'LINESTRING (20 80 20, 98 190 1, 110 180 3, 50 75 900)'::geometry As line ) As foo; lol3d_line_pt | lol2d_line_pt ---------------------------------+-------------------------- LINESTRING(98 190 1,50 74 1000) | LINESTRING(98 190,50 74) ``` MultiLineString and Polygon both 3d and 2d longest line ```SELECT ST_AsEWKT(ST_3DLongestLine(poly, mline)) As lol3d, ST_AsEWKT(ST_LongestLine(poly, mline)) As lol2d FROM (SELECT ST_GeomFromEWKT('POLYGON((175 150 5, 20 40 5, 35 45 5, 50 60 5, 100 100 5, 175 150 5))') As poly, ST_GeomFromEWKT('MULTILINESTRING((175 155 2, 20 40 20, 50 60 -2, 125 100 1, 175 155 1), (1 10 2, 5 20 1))') As mline ) As foo; lol3d | lol2d ------------------------------+-------------------------- LINESTRING(175 150 5,1 10 2) | LINESTRING(175 150,1 10) ```