boundary BOX2D_to_LWGEOM BOX3D_to_LWGEOM buffer cart2geog centroid CIRC_NODE circ_tree_free clamp_srid contains containsproperly coveredby covers crosses deg2rad disjoint DIST_MAX DIST_MIN distance distance3d DOT edge_contains_coplanar_point edge_distance_to_edge edge_distance_to_point edge_intersection edge_intersects FP_ABS FP_CONTAINS FP_CONTAINS_BOTTOM FP_CONTAINS_EXCL FP_CONTAINS_INCL FP_CONTAINS_TOP FP_EQUALS FP_GT FP_GTEQ FP_IS_ZERO FP_LT FP_LTEQ FP_MAX FP_MIN FP_NEQUALS FP_TOLERANCE geog2cart geographic_point_equals geographic_point_init geography_azimuth geography_bestsrid geography_covers geography_distance geography_dwithin geography_eq geography_from_geometry geography_length geography_lt geometry_from_geography getMachineEndian getSRIDbySRS getSRSbySRID gridspec intersection intersects intersects3d issimple lw_dist2d_recursive lw_dist2d_seg_seg lw_dist3d_pt_pt lw_dist3d_pt_seg lw_dist3d_recursive lw_dist3d_seg_seg LWGEOM_addpoint LWGEOM_azimuth lwgeom_calculate_circ_tree LWGEOM_closestpoint LWGEOM_closestpoint3d LWGEOM_collect_garray LWGEOM_dwithin LWGEOM_dwithin3d lwgeom_eq LWGEOM_geometryn_collection LWGEOM_get_srid lwgeom_hash 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_pointn_linestring LWGEOM_reverse LWGEOM_set_srid LWGEOM_setpoint_linestring LWGEOM_shortestline2d LWGEOM_shortestline3d lwline_is_empty lwpoint_clone lwpoint_same lwprint_double normalize overlaps p2d_same p3d_same p4d_same PG_GETARG_GSERIALIZED_P PG_GETARG_GSERIALIZED_P_COPY pgis_union_geometry_array PIR_A_TOUCH_LEFT PIR_A_TOUCH_RIGHT PIR_B_TOUCH_LEFT PIR_B_TOUCH_RIGHT PIR_COLINEAR PIR_INTERSECTS PIR_NO_INTERACT POSTGIS_FREE_IF_COPY_P ptarray_length_spheroid rad2deg relate_full relate_pattern sphere_distance spheroid_distance spheroid_init_from_srid srid_is_latlong ST_Equals touches transform VECTORLENGTH within

centroid() Datum centroid ( PG_FUNCTION_ARGS  )