PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual205 / 310Shortest line between point and linestringSELECT ST_AsText(ST_ShortestLine(’POINT(100 100) ←↪’::geometry,’LINESTRING (20 80, 98 ←↪190, 110 180, 50 75 )’::geometry)) As sline;sline-----------------LINESTRING(100 100,73.0769230769231115.384615384615)←↪shortest line between polygon and polygonSELECT ST_AsText(ST_ShortestLine(ST_GeomFromText(’ ←↪POLYGON((175 150, 20 40, 50 60, 125 100, 175 15ST_Buffer( ←↪ST_GeomFromText(’POINT(110 170)’), 20))) As slinewkt;LINESTRING(140.752120669087 ←↪125.695053378061,121.111404660392 153.370607753See AlsoST_ClosestPoint, ST_Distance, ST_LongestLine, ST_ShortestLine, ST_MaxDistance7.8.37 ST_TouchesST_Touches — Returns TRUE if the geometries have at least one point in common, but their interiors do not intersect.Synopsisboolean ST_Touches(geometry g1, geometry g2);DescriptionReturns TRUE if the only points in common between g1 and g2 lie in the union of the boundaries of g1 and g2. The ST_Touchesrelation applies to all Area/Area, Line/Line, Line/Area, Point/Area and Point/Line pairs of relationships, but not to thePoint/Point pair.In mathematical terms, this predicate is expressed as: