geom_as_npoint geom_as_npoint_internal geom_as_nsegment geom_as_nsegment_internal get_srid_ways int64arr_to_array npoint_as_geom npoint_as_geom_internal npoint_cmp_internal npoint_constructor npoint_eq npoint_eq_internal npoint_ge npoint_ge_internal npoint_gt npoint_gt_internal npoint_in npoint_le npoint_le_internal npoint_lt npoint_lt_internal npoint_make npoint_ne npoint_ne_internal npoint_out npoint_position npoint_recv npoint_remove_duplicates npoint_route npoint_same_internal npoint_send npoint_set npoint_set_precision_internal npoint_srid_internal npointarr_sort npointarr_to_array npointarr_to_geom_internal nsegment_as_geom nsegment_as_geom_internal nsegment_cmp_internal nsegment_constructor nsegment_end_position nsegment_eq nsegment_eq_internal nsegment_from_npoint nsegment_ge nsegment_ge_internal nsegment_gt nsegment_gt_internal nsegment_in nsegment_le nsegment_le_internal nsegment_lt nsegment_lt_internal nsegment_make nsegment_ne nsegment_ne_internal nsegment_out nsegment_recv nsegment_route nsegment_send nsegment_set nsegment_start_position nsegmentarr_normalize nsegmentarr_to_array nsegmentarr_to_geom_internal rid_from_geom route_exists route_geom route_length

nsegment_start_position() Datum nsegment_start_position ( PG_FUNCTION_ARGS  ) Returns the start position of the network segment.