A study looked at different satellite and reanalysis rainfall data in China. They wanted to see how well these data match actual rain measured by ground sensors. The researchers found that all datasets work better in warmer areas than in cold mountain places. In summer, satellite-based data are more accurate, while in winter, reanalysis data are better. And for extreme heavy rain, satellite data perform better. The accuracy of all data improves as the time period increases, with daily reanalysis data being the most accurate. The study helps improve rainfall prediction for developers and users of these datasets.