JacobAdmin's blog

Change in Early and Late IMERG Product Version

A damaged land/ocean mask file (specifically, a several-gridbox shift to the east and south) has been discovered in IMERG V06A, which causes mis-identification of surface type along coasts in the Kalman filter computation.  While simple to correct, the change in the IMERG results requires shifting to a new sub-version.  As of May 22, the Early and Late Run files have the corrected land/ocean mask file and are labelled V06B.  The adjustment will be seen in the Early and Late data files starting June 1, when the next Kalman statistics are computed.

PPS Announcing GPM 1AGM Version Update from V05A to V05B

PPS will be updating GPM 1AGMI data from V05A to V05B today, Thursday May 09, 2019 because there was a minor bug in the algorithm.  Only 1AGMI will change versions.

The L1AGMI executable was previously not filling in a missing scan if there was an error in reading or processing the scan data from the instrument.  Nothing was being generated in the GMI 1A product in this case.  The bug fix was to fill in a missing scan and annotate this in the file header.

GPM NRT IMERG conversion to V06 and Extended downtime

On 1 May 2019, at approximately 14 UTC, PPS will stop production of IMERG V05 in order to setup and install the new IMERG V06 code for production of early and late products.

This will require an extended period when no IMERG products will be produced or available for users. We estimate an extended period of IMERG unavailability that may last for 5 hours or more.

Upon resumption of IMERG production, V06 will start with data from 1 May
2019 hour 00 UTC. We will reestablish latency of early products to 4 hours, and late products to 14 hours, as soon as possible.

GPM IMERG V06A is being retracted for correction

An error has been discovered in processing the initial batches of V06 IMERG Final Run months.  A design choice in the code ended up retaining microwave precipitation estimates in the latitude band 60°N-S when there is snow/ice on the surface, rather than masking out the estimates due to low performance in such cases.  [Masking for microwave retrievals over surface snow and ice outside that band is correct.]

PPS Announces GPM IMERG V06 Data Availability Starting after 3/13/2019

Starting  this week (Wednesday March 13, 2019 or soon after) PPS will commence GPM IMERG data reprocessing for IMERG V06.  PPS will start reprocessing with the GPM-era data and will make these products available as they are archived.

Thereafter, we will reprocess the TRMM-era data.  The first available products for the GPM-era will start with June 2014. TRMM-era products will span June 2000 - May 2014.   Earlier TRMM-era processing, 1998-01 to 2000-05, will proceed when all required input data have been provided.

PPS Announces Level 2- Level 3 PRPS MT1 SAPHIR V06 reprocessing

PPS will be doing a full reprocessing of Level 2 - Level 3 PRPS MT1 SAPHIR data as V06A for release starting Wednesday March 06, 2019.  In addition to the regular data products there will be a Climatology product as with the current L2-L3 GPROF data products.  The following data will be reprocessed as V06A: 

PPS Announces Limited RETRO-Processing of L1-L3 F16 SSMIS as Version V05B for Apr 2015 through Jan 2018

Starting early the week of March 04, 2019 or shortly after ; PPS will be doing a limited RETRO-processing of Level 1 - Level 3 F16 SSMIS as Version V05B for the period of April 2015 through January 2018.  Please see the table below for the specific products and dates affected.  
If you have previously obtained any of the data listed below, please discard these and replace this data with the retro-processed data as listed. 

PPS Announcing Data Product Version Change for GPM Level 2 and Level 3 GPROF Data -Available Starting Mon Feb. 04, 2019

Beginning on Monday February 04, 2019, the Level 2 and Level 3 GPM GPROF products will be produced with an updated monthly emissivity class file (see developers comments below).  PPS will increment the product version for all Level 2 and Level 3 GPROF products starting with the first full orbit on data date February 1, 2019.  The current version of these products will cease with data date Jan 31, 2019 and will remain unchanged. 
The new production version numbers/ designations will be incremented as shown in the table below.


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