China Daily River Discharge Records (CDR²) dataset

The China Daily River Discharge Records (CDR²) dataset provides satellite-extended daily river discharge records across China from 1990 to 2024. The dataset integrates approximately 2.33 million daily in situ discharge observations from 1,196 gauges, river width time series derived from multi-source optical imagery, and gauge-specific at-a-station hydraulic geometry relationships to reconstruct and extend discharge records for 310 gauges across China. CDR² represents the most comprehensive gauge-constrained satellite-derived daily river discharge dataset currently available for China, and it significantly outperforms existing global satellite-derived products in both accuracy and gauge density.中国逐日河流流量记录（China Daily River Discharge Records，CDR²）数据集提供了1990年至2024年覆盖中国全域的卫星拓展逐日河流流量记录。该数据集整合了来自1196个水文测站的约233万条原位逐日流量观测数据、多源光学影像衍生的河道宽度时间序列，以及各测站专属的站址水力几何关系，以此重建并拓展了中国境内310个水文测站的流量记录。CDR²是目前国内可获取的、经水文测站约束的卫星衍生逐日河流流量数据集中覆盖最为全面的一款，其在精度与测站密度两方面均显著优于现有全球卫星衍生流量产品。