dataset · Global
NASA IMERG - dynamical.org Icechunk Zarr
The Integrated Multi-satellitE Retrievals for GPM (IMERG) is a NASA algorithm that merges precipitation estimates from the constellation of passive microwave satellites in the Global Precipitation Measurement (GPM) mission with microwave-calibrated infrared estimates and monthly gauge analyses to produce a global, gridded, half-hourly precipitation record. IMERG intercalibrates, merges, and interpolates these inputs onto a 0.1 degree grid spanning the TRMM and GPM satellite eras. These datasets
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Licence: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)
Evidence quality: 55.5
Listed in aws-odr public catalogue API on 2026-10-16; relevance/value screened (haiku).
Metadata checked: 2026-10-14T13:20:00.000Z
What's in it
- Data offered docs-verified
- half-hourly precipitation (IMERG Early Run v07) · half-hourly precipitation (IMERG Late Run v07)
- Coverage docs-verified
- Global · TRMM and GPM satellite eras (exact start and end dates not stated)
- Resolution docs-verified
- 0.1 degree grid (spatial); half-hourly (temporal)
- Update frequency docs-verified
- 30 minutes (both early and late runs)
- Formats docs-verified
- Icechunk Zarr
- Access docs-verified
- Free and open, no authentication: public AWS S3 bucket readable without an AWS account (aws s3 ls --no-sign-request); licence CC BY 4.0
Useful for
- Use cases llm-inferred
- Long-term sub-daily precipitation climatology for FRA catchments where local gauges are sparse or absent · Rainfall time series for calibrating or sense-checking hydrological models at catchment scale · Global or cross-border precipitation context for overseas water and civils projects
- Audience llm-inferred
- hydrologists · flood consultants · drainage engineers · climate and meteorological analysts
Limitations
- Constraints llm-inferred
- Satellite-merged 0.1 degree estimates, not point gauge observations; local accuracy is not documented and may be weaker than UK gauge or radar data · Global dataset with no UK-specific tuning or resolution stated in the docs · Exact temporal coverage dates are not given in the docs · Early run is a near-real-time product and is generally less accurate than the Late run (general knowledge, not stated in the docs) · Maintained by a third party (dynamical.org) that translated the source data to Icechunk Zarr, so there is some maintenance dependency
Evidence
- arn:aws:s3:::dynamical-nasa-imerg, arn:aws:sns:us-west-2:761136292730:dynamical-nasa-imerg-object_created
- https://registry.opendata.aws/dynamical-nasa-imerg/
Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.