Answer: Integrated Multi-satellitE Retrievals for Global Precipitation Measurement (IMERG) half-hourly rainfall data is not cumulative. IMERG provides estimates of precipitation rates for each half-hour period. These rates are considered instantaneous snapshots, and users can aggregate them to different time scales (like hourly or daily) to derive 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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