Answer: Integrated Multi-satellitE Retrievals for Global Precipitation Measurement (IMERG) half-hourly rainfall data is not cumulative. Each half hour's IMERG value is based on a single snapshot that is assumed to apply for the entire half hour (expressed in the intensive units of "mm/hr"). Users can aggregate the time series of values to different time scales (like hourly or daily) to compute cumulative precipitation amounts if needed.
References:
IMERG Volume 7 ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
IMERG Technical Documentation
FAQ: Is IMERG half-hourly rainfall cumulative?
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FAQ: Is IMERG half-hourly rainfall cumulative?
Last edited by GES DISC - jimacker on Mon Jun 23, 2025 9:20 pm America/New_York, edited 1 time in total.
Reason: Replaced with better answer
Reason: Replaced with better answer
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