This is a collection of the ancillary data of the Global River Bankfull Discharge (GQBF). It consists of 6 columns, [domain, reach_id, cv, darea_flag, grwl_width_flag, mapped]. This data should be matched with the GQBF dataset with [domain, reach_id]. The cv (coefficient of variation) indicates the relative uncertainty in the global estimation of bankfull river discharge (GQBF). The CV represents the variability among the tree-level estimations produced by the deployed random forest model and is calculated as the ratio of the standard deviation to the mean value across all tree estimations. The darea_flag, grwl_width_flag indicate whether the drainage area, width of the river reach is out-of-distribution of the training samples of the bankfull discharge, respectively. The mapped column flags river reaches as 0 when they either have width narrower than 30 m (or their overlap with the GRWL_WIDTH <0.5), or their estimated bankfull discharge is null, otherwise it is 1. Note, the out-of-distribution river reaches are not considered as a rule to calculate this field. Those out-of-distribution river reaches should be identified with the darea_flag, grwl_width_flag. Change log v0.1 - 2024-09-29 First globally complete dataset published v0.1 - 2024-11-19 Add vector files for regions SI, SP v0.1 - 2025-10-27 Add the coefficient of variation of bankfull discharge estimations v0.1 - 2026-02-06 Add compiled ancillary data for bankfull discharge estimations