Linestring operations

line_interpolate_point(line, distance[, ...])	Returns a point interpolated at given distance on a line.
line_locate_point(line, other[, normalized])	Returns the distance to the line origin of given point.
line_merge(line[, directed])	Returns (Multi)LineStrings formed by combining the lines in a MultiLineString.
shared_paths(a, b, **kwargs)	Returns the shared paths between geom1 and geom2.
shortest_line(a, b, **kwargs)	Returns the shortest line between two geometries.