GPM IMERG Early: Daily Global Precipitation Estimates

Global surface precipitation rates are estimated at a 0.1-degree spatial resolution and a daily temporal resolution, beginning in the year 2000. This dataset is the 'Early Run' product from NASA's GPM mission, providing expedited daily mean precipitation rates in mm/day with a 4-hour latency for rapid-response applications. It combines observations from an international satellite constellation, though estimates have lower skill over frozen surfaces, complex terrain, and coastal zones.

Use Cases

• Flood forecasting and early warning systems based on near-real-time daily precipitation estimates.
• Drought monitoring and agricultural planning using global, high-resolution precipitation data.
• Climate trend analysis over regions with sparse ground observations, leveraging the multi-year time series beginning in 2000.
• Validating and calibrating hydrological models with satellite-derived precipitation inputs.

Strengths

• Provides global coverage at a fine 0.1-degree spatial resolution.
• Offers a long time series of data beginning in the year 2000.
• Designed for rapid response with a 4-hour latency for the Early Run product.

Limitations

• Precipitation estimates are noted to have lower skill over frozen surfaces, complex terrain, and coastal zones.
• Metadata for specific column names, row counts, and precise last update dates is missing from all provided sources.
• The changing satellite constellation over time may introduce artifacts affecting multi-year change studies.

Provenance

Source

NASA Global Precipitation Measurement (GPM) mission, a joint project with JAXA.

Collection Method

Derived from half-hourly satellite retrievals (GPM_3IMERGHHE) using advanced multi-satellite fusion techniques.

Time Range

2000 to present

Geography

Global