PPS

V04 Reprocessed Early and Late IMERG products

The GPM project has reprocessed all the original NRT IMERG data both EARLY and LATE to product version V04A.  In addition, this reprocessing brought the IMERG  dataset back to the beginning of the GPM mission in March 2014.  The original NRT IMERG started its processing in March of 2015.

Currently only the HDF5 products have been reprocessed to V04A.  The TIFF/TFW versions will also be reprocessed but this will take a while longer.

Start of V05A NRT Swath Products

Effective approximately 04:00 UTC, 9 May 2017 the near-realtime swath products (GMI, partner constellation, radar and combined) will be upgraded from V04 to V05. 

During the conversion the latency of near-realtime will be affected as all the new code and support files need to be modified to carry out this upgrade. We hope this will take no more than 2 hours but can not guarantee it might not be longer.

Change in IMERG early 2/5/2017-3/12/2017

During the initial setup up for V04 IMERG, an error was made in the configuration for running the EARLY version of IMERG. This affected the V04A early data from Feb 5 - March 12, 2017. 

This error caused the early and the late products to be identical. Given that the LATE product is the more accurate product this might not be an issue for many users. However, users who need a consistent approach in the early data will need to download IMERG early Feb 5-March 12, 2017 again.

Replacement GPM Ka/Ku L1B products (2017-03-19) for orbit 17356


PPS received replacement GPM Ka/Ku L1B products from JAXA and will reprocess the affected data. If you have already obtained products with orbit #17356 from our archive or through a standing order, etc., please discard and use the replacement products.

PPS has replaced the following GPM Ka/Ku L1B data:

GPMCOR_KUR_1703190533_0705_017356_1BS_DUB_04A.h5
GPMCOR_KAR_1703190533_0705_017356_1BS_DAB_04A.h5

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PPS will reprocess these affected downstream products shortly.

Upcoming IMERG version update to V04A

The algorithm for the Integrated Multi-satellitE Retrievals for GPM (IMERG) Early and Late Runs has now been upgraded to Version 04.  The transition to V04 is planned to happen on Monday, March 13 by 15 UTC at PPS and the new data should start flowing down to the GES DISC as well. 

Access and data fields continue to be the same as for Version 03, except the version number is 04A. Initially, the data records begin on 5 February 2017 for the Late Run, and about 5 hours before the time when PPS begins processing after the switchover for the Early Run.

GPM Combined Radar-Radiometer Precipitation Algorithm Theoretical Basis Document (ATBD) (Version 4)

Published Date: 
03/28/2016

The GPM Combined Radar-Radiometer Algorithm performs two basic functions: first, it provides, in principle, the most accurate, high resolution estimates of surface rainfall rate and precipitation vertical distributions that can be achieved from a spaceborne platform, and it is therefore valuable for applications where information regarding instantaneous storm structure are vital.

Mission Affiliation: 
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Goddard Convective-Stratiform Heating (CSH) Algorithm

Document File: 

Latent heating (LH) cannot be measured directly with current techniques, including current remote sensing or in situ instruments, which explains why nearly all satellite retrieval schemes depend heavily on some type of cloud-resolving model or CRM (Tao et al. 2006, 2016). This is true for the current CSH algorithm (Tao et al. 2010).

Input: Combined 2BCMB (DPR + GMI) rainfall products

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PPS GPM Replacement of Combined and Downstream Products December 08, 2016

PPS received replacement PRL1KA/KU files from JAXA.  PPS will reprocess the affected data including combined and downstream products (2AKa, 2AKu, 2ADPR, 2BCMB, 2HCSH, 2HSLH, 3GCSH, 3GSLH) from 2016-12-17 16:31:39 -> 2016-12-17 18:04:13.
If you have obtained any of these products from our archive or through a Standing Order, etc., please discard these and use the replacement products.

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The following files and corresponding browse products will be replaced

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