The Transition in Multi-Satellite Products from TRMM to GPM (TMPA to IMERG)

Published Date: 
Friday, November 1, 2019

The transition from the Tropical Rainfall Measuring Mission (TRMM) data products to the Global Precipitation Measurement (GPM) mission products is well underway. This document specifically addresses the multi-satellite products, the TRMM Multi-satellite Precipitation Analysis (TMPA), the real-time TMPA (TMPA-RT), and the Integrated Multi-satellitE Retrievals for GPM (IMERG).

The TRMM satellite ran out of altitude-keeping fuel in July 2014. On 7 November 2014 the satellite descended to an altitude that precluded useful TRMM Precipitation Radar data, although the TRMM Microwave Imager (TMI) functioned alone, with slowly changing characteristics until the decommissioning in April 2015.

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