What are the IMERG variables in Giovanni?
The following table provides a quick reference for the IMERG variables that can be visualized using Giovanni.
Product |
Variable and Description |
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GPM_3IMERGHHE 30-min averaged data |
Merged microwave-only precipitation estimate [Final] Precipitation estimates from combining microwave data from the GMI, TMI, and other partner instruments. |
Random error for gauge-calibrated multi-satellite precipitation [Final, Early, Late] This is an estimate of the non-systematic component of the error. The exact variable name depends on the product, but all begin with "Random error..." |
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Microwave satellite observation time [Final] Observation time of the microwave precipitation estimates given as minutes from the beginning of the current half-hour. |
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Microwave satellite source identifier [Final] This is an integer between 0 and 24 that corresponds to the instrument from which the microwave precipitation estimate was taken. See *3IMERGHH data fields* in the Integrated Multi-satellitE Retrievals for GPM (IMERG) Technical Documentation |
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Weighting of IR-only precipitation relative to the morphed merged microwave-only precipitation estimate [Final] This is the weighting of the infrared data in the final merged estimate, given in percent. Zero means either no IR weighting or no precipitation. |
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IR-only precipitation estimate [Final] This is the microwave-calibrated infrared precipitation estimate. |
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Multi-satellite precipitation estimate with (climatological) gauge calibration [Final, Early, Late] This is the precipitation estimate that is calibrated with monthly gauge data for the Final Run. This variable is recommended for most users. Note: The gauge calibration used in Early and Late would be climatological, but in V06 no calibration is applied in either Early or Late. |
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Multi-satellite precipitation estimate [Final] This is the precipitation estimate that has not been calibrated with gauge data. |
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Accumulation-weighted probability of liquid precipitation phase [Final] This is the probability of liquid precipitation. The probabilities are calculated globally regardless of whether precipitation is actually present |
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GPM_3IMERGM 1 month averaged data |
Weighting of observed gauge precipitation relative to the multi-satellite precipitation estimate This is the percent weighting of the surface gauge data. |
Merged satellite-gauge precipitation estimate This is the precipitation estimate that has been calibrated with gauge data. This variable is recommended for most users. |
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Accumulation-weighted probability of liquid precipitation phase This is the probability of liquid precipitation. The probabilities are calculated globally regardless of whether precipitation is actually present. |
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Random error for merged satellite-gauge precipitation This is an estimate of the non-systematic component of the error. |