GPM_3IMERGDL: Global Daily Satellite Precipitation Estimates

Data from 2000 onward provides daily mean precipitation rates at a 0.1-degree (approx. 10 km) spatial resolution. This dataset is the 'Late Run' product from NASA's GPM IMERG algorithm, offering expedited estimates with a 14-hour latency for same- or next-day applications. It synthesizes observations from an international satellite constellation to estimate surface precipitation globally, including over regions with sparse ground observations.

Use Cases

• [Flood monitoring and early warning] based on [daily, near-real-time global precipitation estimates with 14-hour latency]
• [Climate trend analysis] based on [global, multi-year time series beginning in 2000]
• [Hydrological model calibration] based on [precipitation data over regions with sparse reliable surface observations]
• [Agricultural drought assessment] based on [daily accumulated precipitation rates at a 0.1-degree resolution]

Strengths

• Provides global coverage at a fine 0.1-degree spatial resolution, enabling detailed regional analysis.
• Offers a long-term, consistent record beginning in 2000, supporting climate and trend studies.
• Algorithm version 07 minimizes dry bias present in earlier versions for cells with sparse half-hourly observations.
• Available under a permissive CC-BY-4.0 license, facilitating open use and redistribution.

Limitations

• Satellite precipitation estimates are noted to have lower skill over frozen surfaces, complex terrain, and coastal zones.
• Metadata on exact dataset size, row count, and specific last update date is missing from all provided sources.
• The changing satellite constellation over time may introduce artifacts affecting studies of multi-year changes.

Provenance

Source

NASA Goddard Earth Sciences Data and Information Services Center (GES DISC), part of the joint NASA-JAXA Global Precipitation Measurement (GPM) mission.

Collection Method

Derived from half-hourly GPM_3IMERGHHL data using the Integrated Multi-satellitE Retrievals for GPM (IMERG) algorithm, which combines precipitation observations from an international satellite constellation.

Time Range

2000 onward

Geography

Global