circ_internal_nodes_sort circ_node_is_leaf circ_node_max_distance circ_node_min_distance CIRC_NODE_SIZE circ_nodes_sort_cmp circ_tree_contains_point circ_tree_distance_tree circ_tree_distance_tree_internal circ_tree_free circ_tree_get_point geography_closestpoint geography_interpolate_points geography_line_interpolate_point geography_line_locate_point geography_line_substring geography_serialize geography_shortestline geography_substring geography_tree_closestpoint geography_tree_shortestline interpolate_point4d_sphere lwgeom_calculate_circ_tree PG_GETARG_GSERIALIZED_P_COPY ptarray_has_m ptarray_has_z ptarray_length_sphere ptarray_locate_point_spheroid spheroid_init

geography_substring() POINTARRAY* geography_substring ( POINTARRAY *  ipa, double  from, double  to, double  tolerance  )