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IMERG V07 ATBD

Date Last Updated
July 12th, 2023
Document Description

This document describes the algorithm and processing sequence for the Integrated Multi-satellitE Retrievals for the Global Precipitation Measurement (GPM) mission (IMERG). This algorithm is intended to intercalibrate, merge, and interpolate “all” satellite microwave precipitation estimates, together with microwave-calibrated infrared (IR) satellite estimates, precipitation gauge analyses, and potentially other precipitation estimators at fine time and space scales for the Tropical Rainfall Measuring Mission (TRMM) and GPM eras over the entire globe.

File Downloads
IMERG_V07_ATBD_final_230712.pdf

IMERG V07 Release Notes

Date Last Updated
November 20th, 2024
Document Description

The algorithm for the Integrated Multi-satellitE Retrievals for GPM (IMERG) has now been upgraded to Version 07.  IMERG V07 involves a wide range of changes to all aspects of the algorithm, many of which are implemented in response to feedback on V06, which was the first time the IMERG record spanned the TRMM-GPM eras.  IMERG V07 is being reprocessed for the entire TRMM-GPM record and thus supersedes all prior IMERG versions, as well as superseding the prior TRMM-based TMPA products (3B42, 3B43).

File Downloads
IMERG_V07_ReleaseNotes_241126.pdf

GPM Captures Typhoon Mawar

GPM Core Observatory data of precipitation within Typhoon Mawar
Wednesday, July 5, 2023
Driven by powerful winds and intense rainfall, Typhoon Mawar emerged as a rapidly intensifying storm in the western Pacific Ocean. Originating from a tropical disturbance, the typhoon swiftly developed into a significant weather system, eventually making landfall on the U.S. territory of Guam on May 25, 2023, as a Category 4 typhoon. After hitting Guam, it further intensified into a Category 5 typhoon, making it one of the most powerful storms on record in the month of May. Download this video from the NASA Goddard Scientific Visualization Studio The combination of NASA’s IMERG precipitation
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Status of IMERG V07 Reprocessing and GPM Near Real-Time

The IMERG algorithm team has finalized the IMERG V07 algorithm for the final product. This is the one that is generated with a 3 month latency. PPS has started the reprocessing and processing of V07 IMERG final. The V07 reprocessed final files will soon be available from PPS. The algorithm team has requested that the entire TRMM/GPM era IMERG-final product be reprocessed before the near real-time (NRT) early (4 hour latency) or late (14 hour latency) products are produced at V07. This will allow them to use the final IMERG product to update ancillary files used as part of the early and late

GPM Level 2 and Level 3 Data Products will be Designated V07B Starting Sat. July, 1, 2023

Commencing with the data date of Saturday July 1, 2023, all GPM Level 2 and Level 3 data products will be updated to the designation V07B. PPS will be making these V07B data products available to the public starting on Thursday July 06, 2023. This version update is necessary since there has been a change to the GPM autosnow input data for these GPM Level 2 and Level 3 algorithms. PPS GPM Level 2 and Level 3 data processing will be on hold between Sat July 01 -Tue July 04, 2023 in order to close out the GPM Level 2 and Level 3 V07A products through June 30, 2023. On Wed July 05, 2023 we will
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