F17 SSMIS Data Processing on Hold

There continues to be intermittent anomalies in the F17 37v channel. The science team is in the process of making a decision on how to proceed forward with the F17 SSMIS data.

PPS will be halting L1C forward production of the F17 data until a decision is reached. Please note that this information pertains only to the PPS Standard Research products. Additional information will be sent for NRT (Near realtime) as appropriate.

IMERG Early/Late Run Precipitation Anomalies

Beginning on April 6, anomalies in the input SSMIS F17 precipitation estimates were detected in the IMERG Early and Late runs.  These anomalies manifest as episodic “swath shaped” areas of high precipitation over land which appear to affect most orbits to some degree.  The root cause is degradation in the 37 GHz V polarization channel.  On April 13 the issue was somewhat mitigated but we continue to monitor the situation.  Please let us know if you detect these (or other anomalies) in the IMERG Early and Late Runs after April 13.

File Naming Convention for Precipitation Products For the Global Precipitation Measurement (GPM) Mission

Published Date: 

This document describes the file naming conventions that will be used to name data products produced by the Precipitation Processing System (PPS) for the Global Precipitation Measurement (GPM) Mission. 

Mission Affiliation: 
Major Category: 

V04 Processing for GPM Near-Realtime (NRT) is Scheduled to Begin

Late on March 2, 2016, the GPM NRT system will begin using V04 algorithms for:

  • Level 1B GMI
  • Level 1C GMI
  • Level 1 Radar
  • Level 2 Radar
  • Level 2 Combined

V04 is the first version that uses GPM as the calibrator for the constellation rather than TRMM. The GPROF database is built using the combined observations. GMI is extremely well calibrated and the brightness temperatures in 1B and 1C are an important improvement over those in V03.

PPS To Begin Version 4 GPM and Partner Satellite Data Processing

PPS will commence Version 4 processing of GPM and Partner satellite products in early March 2016.  All current Version 3 products will be processed through February 29, 2016.  Once the current products are completed there will be a delay before the first version 4 products will be made available to the public.

Intermittent PPS Network Outages From Fri Feb 19 - Mon Feb. 22, 2016

UPDATE 2/22/16: The network upgrades have finished and normal service has been restored.

Due to scheduled external GSFC network upgrades, PPS will experience intermittent and unpredictable network outages during the period of Friday February 19, 2016 (starting 8:00PM EST-0100 UTC)  through Monday February 22, 2016 (3:00 AM EST-0800 UTC).   

This work will impact access to the following PPS services:

Potential Upcoming Data Outages Due to Severe Winter Storm

The Washington, DC area is about to get hit with a record-level snow storm, with attendant disruptions to work schedules, travel, communications, and power.  If you find that the TMPA-RT products drop out, it is safe to assume that some combination of these effects is preventing production, and we will work to restore service when that is possible.

Positional Algorithm Issue with GMI 85GHz

One of our scientists noticed that the 85GHz H and V channels have missing values in ascending passes just south of 20 deg S. In that region it appears consistently since 10:45UTC which is the earliest we checked. The other channels seem fine.

The counts for the 85GHz channels appear to be fine as is the geolocation. However both the 1B and 1 Base files have the missing values in that area. We are checking what is causing the algorithm to list the values as missing.

Please keep this in mind when using those channels.


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