geo_is_empty geo_typename geog_area geog_centroid geog_length geog_perimeter geom_azimuth geom_length geom_perimeter line_numpoints line_point_n

line_point_n() GSERIALIZED * line_point_n ( const GSERIALIZED *  gs, int  n  ) Return the n-th point of a line. Parameters [in] gs Geometry [in] n Number (1-based) Returns Return NULL if there is no LINESTRING(..) in GEOMETRY or n is out of bounds.