Summary
This 2020 comparative analysis evaluated whether satellite precipitation products, particularly NASA's GPM IMERG, have improved in accuracy and utility over the preceding two decades relative to nine competing satellite and reanalysis datasets. The work assessed multiple performance metrics across diverse geographical contexts, providing systematic evidence on the trajectory of remote-sensing precipitation measurement. Such benchmarking is relevant to hydrological modelling, climate studies, and water resource management applications in agriculture and beyond.
UK applicability
The findings on satellite precipitation product accuracy are applicable to UK rainfall monitoring, flood forecasting, and hydrological modelling. Improved precipitation datasets support UK agricultural decision-making, irrigation management, and climate impact assessments, particularly as weather patterns become less predictable.
Key measures
Precipitation estimation accuracy (bias, root mean square error, correlation coefficients); temporal and spatial resolution; product coverage and availability across regions and time periods
Outcomes reported
The study compared the accuracy and evolution of the GPM IMERG satellite precipitation product against nine other satellite and reanalysis datasets over two decades. It assessed improvements in precipitation estimation quality across diverse geographical and climatic regions.
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