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Results show that all sparse gauge networks persistently underestimate the performance of IMERG according to most metrics.
In addition to improving quantitative efficiency, the estimated rainfall field showed good visual performance in the presence of sparse gauge stations.
For comparison with the dense gauge network serving as "ground truth", 500 sparse gauge networks are generated through random combinations of gauge numbers at each set of spatiotemporal scales.
The sparse gauge networks over those regions, especially over remote areas and high-elevation regions, cannot represent the spatiotemporal variability of extreme rainfall events and hence preclude developing depth-duration-frequency curves (DDF) for rainfall frequency analysis.
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Our proposed framework has the potential for constructing DDF curves for regions with limited or sparse gauge-based observations using remotely sensed precipitation information, and the spatiotemporal resolution of the adjusted PERSIANN-CDR data provides valuable information for various applications in remote and high elevation areas.
Since precipitation is commonly the most important input data in hydrological models, model performance and uncertainty will be negatively impacted in areas with sparse rain gauge networks.
The study, which relies on a sophisticated probabilistic technique that identifies patterns linking the sparse tide gauges, also found that from 1993 to 2010, sea levels rose 3 millimeters a year in line with other tide gauge analyses.
Model uncertainty is higher when rain gauges are sparse, as is often the case in practice.
However, tide gauges are sparse, of questionable quality, and occasionally contradictory in their sea-level estimates.
If you're a developing nation, don't worry about having a sparse network of rain gauges: All you need is good cellphone coverage.
The CV error statistics indicate that merging of the two datasets improves the estimation of spatial rainfall, and more so where the rain gauge network is sparse.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com