IMERG

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.

IMERG V04 Early and Late Online

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 began at 15 UTC on March 13 and both the early and the late products were back to their target latency by 01:00 UTC, March 14.

The transition took longer than planned but the core IMERG version 04 products are now running automatically as the original V03. The product version is V04A and you will see this in the name of the IMERG HDF5 products. 

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.

Gauge Combination Error in 2016, Affects 3B42/43 and IMERG Final Run

We have discovered that the gauge analysis was erroneously omitted from the "production" 3B42/43 products starting with January 2016 due to issues with handling a change of data format.  Thus, the production 3B42/43 are being re-computed.  This does not affect the TMPA-RT suite of products, since no month-to-month gauge data are used.

Note this issue also affects the current Version 3 IMERG Final Run products for January 2016.  They are being recomputed as well.  The current Version 3 IMERG Early and Late Runs are not affected.

Jan. 2016 GPM IMERG and Jan.-Jun. 2016 TMPA 3B42/3B43 Data Products are Being Recalled and Replaced

UPDATE 9/27/16:

January 2016 IMERG has been regenerated and posted.  This was necessary
due to an error that omitted the gauge analysis in the Final products.
Also, 3B42/3B43 have been recomputed and posted. Let me know if you have
any further questions. 

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PPS has removed the January 2016 GPM IMERG and January through June 2016 3B42/3B43 TMPA products from our ftp archive:

ftp://arthurhou.pps.eosdis.nasa.gov/

GPM Transitioning its Web-based Global Displays

What:
Google Earth access for near-realtime IMERG and 3B42 KML files will be replaced by an updated service for viewing precipitation data in near-real time on a 3D virtual globe using Cesium (https://cesiumjs.org/).

When:
The current plan is to make the cut-over to the new Cesium-based service on or about October 16, 2016.

Why:
The evolution of network policies and applications prevents continued GPM use of Google Earth.

PPS Down for Maintenance Tuesday September 20, 2016

The PPS (Precipitation Processing System) will be down today, September 20,2016 from 8:00am -2:00pm EDT (12:00 - 18:00 UTC). for scheduled maintenance.

During this time all data transfers between PPS source and its consumer systems (GDAAC/DISC) as well as Science User services (FTP and STORM access) will be unavailable.

You may contact PPS Operations at 301-614-5247 , 301-614-5184 or fax us at 301-614-5269 if there are any urgent matters requiring our immediate attention during this period.

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