boundary BOX2D_to_LWGEOM BOX3D_to_LWGEOM buffer centroid contains containsproperly coveredby covers crosses disjoint geography_azimuth geography_bestsrid geography_covers geography_distance geography_dwithin geography_eq geography_from_geometry geography_in geography_intersects geography_length geography_lt geography_out geometry_from_geography getSRIDbySRS getSRSbySRID issimple LWGEOM_addpoint LWGEOM_azimuth LWGEOM_closestpoint LWGEOM_closestpoint3d LWGEOM_collect_garray LWGEOM_dwithin LWGEOM_dwithin3d lwgeom_eq LWGEOM_geometryn_collection LWGEOM_get_srid lwgeom_hash LWGEOM_in LWGEOM_isempty LWGEOM_length_linestring LWGEOM_line_interpolate_point LWGEOM_line_locate_point LWGEOM_line_substring lwgeom_lt LWGEOM_makepoint LWGEOM_numgeometries_collection LWGEOM_numpoints_linestring LWGEOM_out LWGEOM_pointn_linestring LWGEOM_reverse LWGEOM_set_srid LWGEOM_setpoint_linestring LWGEOM_shortestline2d LWGEOM_shortestline3d overlaps PG_GETARG_GSERIALIZED_P PG_GETARG_GSERIALIZED_P_COPY pgis_union_geometry_array relate_full relate_pattern ST_3DDistance ST_3DIntersects ST_Distance ST_Equals ST_Intersection ST_Intersects touches transform within

LWGEOM_isempty() Datum LWGEOM_isempty ( PG_FUNCTION_ARGS  )