Delivery of Suomi National Polar-orbiting Partnership (Suomi NPP) satellite data products will cease on November 1, 2026. Data users should transition now to alternative products from NOAA-21 and NOAA-20.Suomi NPP data announcement
Description
Version 07B is the current version of the IMERG data sets. Older versions will no longer be available and have been superseded by Version 07.
The Integrated Multi-satellitE Retrievals for GPM (IMERG) is the unified U.S. algorithm that provides the multi-satellite precipitation product for the U.S. GPM team.
The precipitation estimates from the various precipitation-relevant satellite passive microwave (PMW) sensors comprising the GPM constellation are computed using the 2021 version of the Goddard Profiling Algorithm (GPROF2021), then gridded, intercalibrated to the GPM Combined Ku Radar-Radiometer Algorithm (CORRA) product, and merged into half-hourly 0.1°x0.1° (roughly 10x10 km) fields. Note that CORRA is adjusted to the monthly Global Precipitation Climatology Project (GPCP) Satellite-Gauge (SG) product over high-latitude ocean to correct known biases.
The half-hourly intercalibrated merged PMW estimates are then input to both a Morphing-Kalman Filter (KF) Lagrangian time interpolation scheme based on work by the Climate Prediction Center (CPC) and the Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks (PERSIANN) Dynamic Infrared–Rain Rate (PDIR) re-calibration scheme. In parallel, CPC assembles the zenith-angle-corrected, intercalibrated merged geo-IR fields and forwards them to PPS for input to the PERSIANN-CCS algorithm (supported by an asynchronous re-calibration cycle) which are then input to the KF morphing (quasi-Lagrangian time interpolation) scheme.
The KF morphing (supported by an asynchronous KF weights updating cycle) uses the PMW and IR estimates to create half-hourly estimates. Motion vectors for the morphing are computed by maximizing the pattern correlation of successive hours within each of the precipitation (PRECTOT), total precipitable liquid water (TQL), and vertically integrated vapor (TQV) data fields provided by the Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2) and Goddard Earth Observing System model Version 5 (GEOS-5) Forward Processing (FP) for the post-real-time (Final) Run and the near-real-time (Early and Late) Runs, respectively. The vectors from PRECTOT are chosen if available, else from TQL, if available, else from TQV. The KF uses the morphed data as the “forecast” and the IR estimates as the “observations”, with weighting that depends on the time interval(s) away from the microwave overpass time. The IR becomes important after about ±90 minutes away from the overpass time. Variable averaging in the KF is accounted for in a routine (Scheme for Histogram Adjustment with Ranked Precipitation Estimates in the Neighborhood, or SHARPEN) that compares the local histogram of KF morphed precipitation to the local histogram of forward- and backward-morphed microwave data and the IR.
The IMERG system is run twice in near-real time:
"Early" multi-satellite product ~4 hr after observation time using only forward morphing and
"Late" multi-satellite product ~14 hr after observation time, using both forward and backward morphing
and once after the monthly gauge analysis is received:
"Final", satellite-gauge product ~4 months after the observation month, using both forward and backward morphing and including monthly gauge analyses.
In V07, the near-real-time Early and Late half-hourly estimates have a monthly climatological concluding calibration based on averaging the concluding calibrations computed in the Final, while in the post-real-time Final Run the multi-satellite half-hourly estimates are adjusted so that they sum to the Final Run monthly satellite-gauge combination. In all cases the output contains multiple fields that provide information on the input data, selected intermediate fields, and estimation quality. In general, the complete calibrated precipitation, precipitation, is the data field of choice for most users.
Precipitation phase is a diagnostic variable computed using analyses of surface temperature, humidity, and pressure.
Product Summary
Platforms
IMERG
Instruments
NOT APPLICABLE
Projects
GPM
Spatial Extent
N: 90S: -90E: 180W: -180
Location
GLOBAL
,
GLOBAL LAND
,
GLOBAL OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
1998-01-01
Data Partner
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Huffman, G. J., Stocker, E. F., Bolvin, D. T., Nelkin, E. J., & Tan, J. (2023). GPM IMERG Late Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V07 [Dataset]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/GPM/IMERG/3B-HH-L/07 Date Accessed: 2026-09-09
@misc{suvijya arya_2026,
title={Sentinel-LEWS: An Edge-Deployable, Physics-Based System for Rainfall-Triggered Landslide Early Warning through Multi-Resolution Data Fusion},
url={https://zenodo.org/doi/10.5281/zenodo.21126727},
DOI={10.5281/ZENODO.21126727},
abstractNote={This record archives the code and derived data products for the paper "An Edge-Deployable, Physics-Based System for Rainfall-Triggered Landslide Early Warning through Multi-Resolution Data Fusion." Sentinel-LEWS couples GPM IMERG satellite rainfall with 30 m SRTM terrain in an infinite-slope Factor-of-Safety engine that runs offline in under 50 MB per district and issues 160-character SMS alerts without a network. The archive contains the full processing and validation pipeline (IMERG-to-API builder, per-pixel minimum-Factor-of-Safety terrain builder, backtest, skill metrics, Caine baseline, ablation, bootstrap and sensitivity analyses, and figure scripts), the deployable per-district edge packages, and the derived data products (antecedent-precipitation arrays, per-cell FoS curves, the curated July-2023 Himachal Pradesh event inventory, and all validation outputs) needed to reproduce every figure and table. Raw inputs are NOT included and remain with their providers: GPM IMERG Late Run V07B (NASA GES DISC, doi:10.5067/GPM/IMERG/3B-HH-L/07) and SRTM 1-arc-second terrain (USGS EarthExplorer). Run order and requirements are in the README. The validation is deterministic and reruns end to end.},
publisher={Zenodo},
author={Suvijya Arya},
year={2026},
}
Huffman, G. J., Stocker, E. F., Bolvin, D. T., Nelkin, E. J., & Tan, J. (2023). GPM IMERG Late Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V07 [Dataset]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/GPM/IMERG/3B-HH-L/07 Date Accessed: 2026-09-09
Huffman, G.J., et al. “GPM IMERG Late Precipitation L3 Half Hourly 0.1 Degree x 0.1 Degree V07.” NASA Goddard Earth Sciences Data and Information Services Center, 2023, https://doi.org/10.5067/GPM/IMERG/3B-HH-L/07. Date Accessed: 2026-09-09
Users of NASA’s precipitation and land data assimilation products converted liquid precipitation rate to snowfall rate and snow depth using snow-to-liquid ratios.
de Souza, Giselle Nerino Brito, de Franca e Silva, Julie Andrews, Ribeiro, Kaleb Lima, de Oliveira, Leonardo Ramos, da Silva, Paulo Ricardo Teixeira, Castellani, Debora Cristina, de Sousa Bueno Filho, Julio Silvio, Santiago, Alailson Venceslau, Vasconcelos, Steel Silva, Teixeira, Wenceslau Geraldes, de Araujo, Alessandro Carioca
The table below lists the variables contained within a single granule for this
dataset. Variables often contain observed or derived geophysical measurements
collected from a variety of sources, including remote sensing instruments on
satellite and airborne platforms, field campaigns, in situ measurements, and
model outputs. The terms variable, parameter, scientific data set, layer, and band
have been used across NASA’s Earth science disciplines; however, variable is the
designated nomenclature in NASA’s Common Metadata Repository (CMR).
Variable metadata attributes such as Name, Description, Units, Data Type, Fill
Value, Valid Range, and Scale Factor allow users to efficiently process and analyze
the data. The full range of attributes may not be applicable to all variables.
Additional information on variable attributes is typically available in the data,
user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
