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Description:

Global Precipitation Measurement (GPM) Final Run v07: Research-quality gridded global multi-satellite precipitation estimates with quasi-Lagrangian time interpolation, gauge data, and climatological adjustment.
The Integrated Multi-satellite Retrievals for GPM (IMERG) is the unified U.S. algorithm that provides the multi-satellite precipitation product for the U.S. GPM team. This algorithm is intended to intercalibrate, merge, and interpolate all satellite microwave precipitation estimates, together with microwave-calibrated infrared (IR) satellite estimates, precipitation gauge analyses, and potentially other precipitation estimators at fine time and space scales for the TRMM and GPM eras over the entire globe. The system is run several times for each observation time, first giving a quick estimate (IMERG Early Run) and successively providing better estimates as more data arrive (IMERG Late Run). The final step uses monthly gauge data to create research-level products (IMERG Final Run).
Overview:
This algorithm is intended to intercalibrate, merge, and interpolate “all” satellite microwave precipitation estimates, together with microwave-calibrated infrared (IR) satellite estimates, precipitation gauge analyses, and potentially other precipitation estimators at fine time and space scales for the TRMM and GPM eras over the entire globe. The system is run several times for each observation time, first giving a quick estimate (IMERG Early Run) and successively providing better estimates as more data arrive (IMERG Late Run). The final step uses monthly gauge data to create research-level products (IMERG Final Run).
The main differences between the IMERG Early and Late Run are:
1. The half-hourly Final Run product uses a month-to-month adjustment to the monthly Final Run product, which combines the multi-satellite data for the month with GPCC gauge analysis. The adjustment within the month in each half hour is a ratio multiplier that’s fixed for the month, but spatially varying.
2. The Late Run is computed about 14 hours after observation time, so sometimes a microwave overpass is not delivered in time for the Late Run, but subsequently comes in and can be used in the Final. This would affect both the half hour in which the overpass occurs, and (potentially) morphed values in nearby half hours.

Citation:

[30 minute] Huffman, G.J., Stocker, E.F., Bolvin, D.T., Nelkin, E.J., and Tan, J., 2023, GPM IMERG Final Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V07, Greenbelt, MD, Goddard Earth Sciences Data and Information Services Center (GES DISC), accessed [YYYY=MM-DD], https://doi.org/10.5067/GPM/IMERG/3B-HH/07
[daily] Huffman, G.J., Stocker, E.F., Bolvin, D.T., Nelkin, E.J., and Tan, J., 2023, GPM IMERG Final Precipitation L3 1 day 0.1 degree x 0.1 degree V07, Edited by Andrey Savtchenko, Greenbelt, MD, Goddard Earth Sciences Data and Information Services Center (GES DISC), accessed [YYYY-MM-DD], https://doi.org/10.5067/GPM/IMERGDF/DAY/07
[monthly] Huffman, G.J., Stocker, E.F., Bolvin, D.T., Nelkin, E.J., and Tan, J., 2023, GPM IMERG Final Precipitation L3 1 month 0.1 degree x 0.1 degree V06, Greenbelt, MD, Goddard Earth Sciences Data and Information Services Center (GES DISC), accessed [YYYY-MM-DD], https://doi.org/10.5067/GPM/IMERG/3B-MONTH/07

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