What is the latency of IMERG?

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GES DISC - ingridgs
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What is the latency of IMERG?

by GES DISC - ingridgs » Thu Sep 03, 2026 2:47 pm America/New_York

Answer:
There are three types of Integrated Multi-satellitE Retrievals for GPM (IMERG), and their nominal latency is as follows:
  • "Early" multi-satellite product ~4 hr after observation time using only forward morphing.
  • "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 ~3.5 months after the observation month, using both forward and backward morphing and including monthly gauge analyses.
Description of the latencies, and their dependency on the various processing systems as summarized in more details on the Global Precipitation Measurement Project website.
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