Data News

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.]

All V06A Monthly and Half-hourly IMERG products are being retracted, as shown in this table (Encompassing all IMERG V06A data that had been reprocessed and archived -to date):

----------+----------------+---------------------+---------------------+------------+---------+--------------+ 

| DataType | ProductVersion | Start of Data       | End of Data # 
| Granules | # Empty | Total Size   |
+----------+----------------+---------------------+---------------------+------------+---------+--------------+ 

| 3IMERGHH | V06A           | 2014-06-01 00:00:00 | 2015-12-31 23:59:59
|      27792 |       0 |     273.23 G |
| 3IMERGM  | V06A           | 2014-06-01 00:00:00 | 2015-12-31 23:59:59
|         19 |       0 |       0.93 G |
+----------+----------------+---------------------+---------------------+------------+---------+--------------+ 


Replacements are anticipated to be released the week of March 25, and will continue to be named V06A since the retracted files are considered faulty.

If you have previously obtained any of the data listed above, please discard these and replace this data with the new data once this is available the week of March 25 or later.

We apologize for any confusion or inconvenience that this may have caused and appreciate your continued patience.
 

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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.

We have attached the latest IMERG documentation for your convenience.

Developers and science users should use the latest PPS TKIO Toolkit Version 3.93 https://pps.gsfc.nasa.gov/gpmtoolkit.html
ftp://gpmweb2.pps.eosdis.nasa.gov/pub/PPStoolkit/GPM/tkio-3.93/

These TRMM/GPM data products will be made available through PPS's "arthurhou" ftp archive:
ftp://arthurhou.pps.eosdis.nasa.gov/
and STORM (PPS's Online Data Ordering Interface):
https://storm.pps.eosdis.nasa.gov
after these products are produced and archived.

Please consult the following PPS public web pages for complete
documentation:

https://pps.gsfc.nasa.gov/GPMprelimdocs.html
https://pps.gsfc.nasa.gov/atbd.html

NASA requires that all science data users register in order to access these products.   If you haven't registered, please visit the PPS registration portal at: 
https://registration.pps.eosdis.nasa.gov/registration/

Thank you for your attention.  Please inform us if you have any questions or concerns.
 

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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: 
+-----------------------------------------+-----------------+-------------------+ 
| DataType                                      |Start of Data | End of Data   | 
+-----------------------------------------+-----------------+-------------------+ 
| 2APRPSMT1SAPHIR                   | 2014-02-01  | 2018-12-15   | 
| 3PRPSMT1SAPHIR                     | 2014-02-01   | 2018-12-31  | 
| 3PRPSMT1SAPHIR_DAY            | 2014-02-01   | 2018-12-15  | 
| 2APRPSMT1SAPHIR_CLIM        | 2011-10-13  | 2018-12-15  | 
| 3PRPSMT1SAPHIR_DAY_CLIM | 2011-10-13   | 2018-12-15  | 
| 3PRPSMT1SAPHIR_CLIM          | 2011-10-13   | 2018-12-31  | 
+---------------------------------------- +-------------------+-----------------+ 

PRPS MT1 SAPHIR V06 represents an advance over the PRPS MT1 SAPHIR V05 retrievals through a larger (Long-term) observational database together with constraining the retrievals by the total  precipitable water and 2m temperature (similar to GPROF), resulting in an improvement in estimates in dry regions.
These TRMM/GPM data products will be made available through the PPS "arthurhou" ftp archive:
ftp://arthurhou.pps.eosdis.nasa.gov/ 
and STORM (PPS's Online Data Ordering Interface):
https://storm.pps.eosdis.nasa.gov
after these products are produced and archived.
NASA requires that all science data users register in order to access these products.   If you haven't registered, please visit the PPS registration portal at: https://registration.pps.eosdis.nasa.gov/registration/
 

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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. 
+-------------------------+---------------------+---------------------+----------------+------------+ 
| DataType                | Start of Data       | End of Data         | ProductVersion | # Granules | 
+-------------------------+---------------------+---------------------+----------------+------------+ 
| 1CF16SSMIS              | 2015-04-24 00:24:57 | 2018-01-16 01:27:40 | V05A           |      14102 | 
| 2AGPROFF16SSMIS         | 2015-04-24 00:24:57 | 2018-01-16 01:27:40 | V05A           |      14102 | 
| 2AGPROFF16SSMIS_CLIM    | 2015-04-24 00:24:57 | 2018-01-16 01:27:40 | V05A           |      14102 | 
| 3GPROFF16SSMIS          | 2015-04-01 00:00:00 | 2018-01-31 23:59:59 | V05A           |         33 | 
| 3GPROFF16SSMIS_CLIM     | 2015-04-01 00:00:00 | 2018-01-31 23:59:59 | V05A           |         33 | 
| 3GPROFF16SSMIS_DAY      | 2015-04-24 00:00:00 | 2018-01-15 23:59:59 | V05A           |        998 | 
| 3GPROFF16SSMIS_DAY_CLIM | 2015-04-24 00:00:00 | 2018-01-15 23:59:59 | V05A           |        998 | 
+-------------------------+---------------------+---------------------+----------------+------------+ 

Due to a sensor data issue, the F16 SSMIS L1C product high frequency channels were flagged as bad and Tc values were set to missing starting with 2015-05-01 data for 150GHz and 2013-12-01 for the 183 channels. Later, the X-CAL team re-evaluated the data and found that these channels became usable again after 2015-08-26. In Sep 2017, PPS updated L1C code to stop the flagging of 150 and 183 channels in the F16 SSMIS L1C product and add warning flags to 91V channel (2015-04-24 to 2015-08-26) and 91H channel (2015-04-24 ongoing). However there was no retro-processing at that time. The purpose of this retro-processing is to put the F16 150 and 183 GHz channels data back to the SSMIS L1C product and to add warning flags to the 91 channels for the specified data period.

These TRMM/GPM data products will be made available through the PPS "arthurhou" ftp archive:
ftp://arthurhou.pps.eosdis.nasa.gov/ 
and STORM (PPS's Online Data Ordering Interface):
https://storm.pps.eosdis.nasa.gov
after these products are produced and archived.
NASA requires that all science data users register in order to access these products.   If you haven't registered, please visit the PPS registration portal at: https://registration.pps.eosdis.nasa.gov/registration/
 

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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.

Data Source                     Product Version                       
F16_SSMIS                              V05B                                                 
F17_SSMIS                              V05B                                                 
F18_SSMIS                              V05B                                                 
GCOMW1_AMSR2                V05B                                                 
METOPA_MHS                       V05D                                                
METOPB_MHS                       V05D                                                
NOAA18_MHS                       V05D                                                
NOAA19_MHS                       V05D   
NOAA20 ATMS                      V05B                                             
NPP_ATMS                             V05E                                                  
The changes made to this GPROF version update are described (below) by the algorithm developer.  Please also refer to the attached ".pdf"  file  to see the geographic area affected.

Emissivity class repair

A monthly emissivity class file is used within the surface type assignment to define the GPROF surface class and thus select similar database profiles.  While examining IMERG data in a new polar stereographic projection, many areas of erroneous precipitation (very high precipitation rates) were observed.   This was found to be caused by incomplete and incorrect assignment of the surface type in Northern Canada and Greenland.   Using an Autosnow created climatology, these surface types were changed in the GPROF ancillary files to a new snow class, instead of a open water classification.  The result greatly reduced the retrievals of anomalous high precipitation, and occur only over the areas highlighted in the following figure.  Precipitation retrievals in ALL other areas are not affected.

All products are in the HDF5 format and will use the GPM naming conventions.  This new GPM data will appear both in STORM: https://storm.pps.eosdis.nasa.gov/storm/
and on "arthurhou":
ftp://arthurhou.pps.eosdis.nasa.gov/

Please visit our registration portal for access to GPM data products if you have not previously registered with PPS:
https://registration.pps.eosdis.nasa.gov/registration/

Level 2 and Level 3 GPROF product release notes and other documentation can be found on the PPS public website at:
https://pps.gsfc.nasa.gov/GPMprelimdocs.html
Other level 2 / level 3 documentation can be found at:
https://pps.gsfc.nasa.gov/atbd.html
and:
https://pps.gsfc.nasa.gov/ppsdocuments.html
on the PPS public website:
https://pps.gsfc.nasa.gov/ 
Please contact the PPS Helpdesk if you have any questions, comments or concerns.
 

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Effective on the date and time above, all the NRY GPROF data product verson  numbers were changed by increasing the letter of the data product version. This letter change means that data products were changed but no backward processing is undertaken. Only the products forward of the date/time have been altered.  So, for GMI GPROF the vesion changed from V05A to V05B. Other instrument GPROF retrievals had a similar change but appropriate to their starting data product version.

The algorithm itself did not change but some of the database profiles did. The algorithm team provided the following information:

A monthly emissivity class file is used within the surface type assignment to define the GPROF surface class and thus select similar database profiles.  While examining IMERG data in a new polar stereographic projection, many areas of erroneous  precipitation (very high precipitation rates) were observed.   This was found to be  caused by incomplete and incorrect assignment of the surface type in Northern Canada  and Greenland.   Using an Autosnow created climatology, these surface types were  changed in the GPROF ancillary files to a new snow class, instead of a open water classification.  The result greatly reduced the retrievals of anomalous high precipitation, and occur only over the areas highlighted in the following figure.  Precipitation retrievals in ALL other areas are not affected.  

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The Precipitation Processing System (PPS) is scheduled to begin TRMM L2-L3 Combined GPM V06A data reprocessing on Wednesday October 31, 2018.
These TRMM/GPM data products will be made available through the PPS "arthurhou" ftp archive:
ftp://arthurhou.pps.eosdis.nasa.gov/

and STORM (PPS's Online Data Ordering Interface):
https://storm.pps.eosdis.nasa.gov
after these products are produced and archived.

NASA requires that all science data users register in order to access these products.   If you haven't registered, please visit the PPS registration portal at: https://registration.pps.eosdis.nasa.gov/registration/

The following data will be reprocessed:

+---------------+------+---------------------+---------------------+----------------------------------------------------------------------------------------------+
| DataType                   | V06A | StartTime                     | StopTime                      | DOI                                                                             |
+---------------+------+---------------------+---------------------+----------------------------------------------------------------------------------------------+
| 2BCMB_TRMM        | V06A | 1997-12-07 23:57:17 | 2015-04-01 11:58:38 | 10.5067/GPM/PRTMI/TRMM/2B/06                   |
| 3CMB_TRMM          | V06A | 1997-12-01 00:00:00 | 2015-03-31 23:59:59 | 10.5067/GPM/PRTMI/TRMM/3B-MONTH/06    |
| 3CMB_TRMM_DAY | V06A | 1997-12-01 00:00:00 | 2015-03-31 23:59:59 | 10.5067/GPM/PRTMI/TRMM/3B-DAY/06           |
+---------------+------+---------------------+---------------------+---------------------------------------------------------------------------------------------+


The Combined Level 2 products in the GPM V06A and TRMM V08 public release notes are attached for your convenience and are also available at:
https://pps.gsfc.nasa.gov/GPMprelimdocs.html

https://pps.gsfc.nasa.gov/Documents/Combine_Caveats_and_Changes_for_public_release.V6&trmm_version_8.rev.pdf

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PPS is releasing version 3.90.0 build of the PPS TKIO toolkit to the public. This version is currently being used for PPS GPM data production.

The tar file directory along with the release notes can be found at:
ftp://gpmweb2.pps.eosdis.nasa.gov/pub/PPStoolkit/GPM/tkio-3.90.0/ 
 
We have also attached these corresponding release notes for your convenience.

If you have any questions, comments or concerns, please contact the PPS Helpdesk at: 
helpdesk@mail.pps.eosdis.nasa.gov
 

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The Precipitation Processing System (PPS) will begin processing and reprocessing GPM Level 2 - Level 3 DPR and Combined data as version V06A.  The switch to V06A for these products will begin with October 01, 2018 GPM data. This data will be available to the public after October 04, 2018 at the earliest once they have been reviewed and approved by the Science Team.

The following data products will be processed/reprocessed as V06A:


 2AKa
 2AKu
 2ADPR
 3DPRD
 3DPR_ASC
 3DPR_DES
 3DPR

 2BCMB

 3CMB_DAY
 3CMB

 2HSLH
 3GSLH
 3HSLH_DAY
 3HSLH

These GPM data products will be made available through the PPS "arthurhou" ftp archive:
ftp://arthurhou.pps.eosdis.nasa.gov/
and STORM (PPS's Online Data Ordering Interface):
https://storm.pps.eosdis.nasa.gov
after these products are produced and archived.

NASA requires that all science data users register in order to access these products.   If you haven't registered, please visit the PPS registration portal at: https://registration.pps.eosdis.nasa.gov/registration/

 

The version of the PPS I/O Toolkit used will be TKIO 3.90.0 or later for these products. Their release notes and tar file are located in this directory:
ftp://gpmweb2.pps.eosdis.nasa.gov/pub/PPStoolkit/GPM/

The product release notes and other documentation can be found on the PPS public website at:
https://pps.gsfc.nasa.gov/GPMprelimdocs.html
https://pps.gsfc.nasa.gov/atbd.html
on the PPS public website:
https://pps.gsfc.nasa.gov/

If you have any concerns, comments or questions, please inform the PPS Helpdesk at:
helpdesk@mail.pps.eosdis.nasa.gov.

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PPS is announcing the availability of the new NOAA20_ATMS products which will be available starting today, Tuesday September 04, 2018

The NOAA20_ATMS data range starts with November 29, 2017 and will be processed to the current date.  November/December 2017 products will be available this afternoon.

The corresponding PPS TKIO to be used with this data is tkio 3.80.26:
ftp://gpmweb2.pps.eosdis.nasa.gov/pub/PPStoolkit/GPM/tkio-3.80.26/

PPS is currently processing the following NOAA20_ATMS products (below). The entire data set will be available over the next couple of weeks.   This consists of:

1CNOAA20ATMS
2AGPROFNOAA20ATMS
3GPROFNOAA20ATMS_DAY
3GPROFNOAA20ATMS

We expect to start processing Climatology products later this week.

The products will be available in PPS's STORM (Online Data Ordering Interface):

https://storm.pps.eosdis.nasa.gov/storm/
and on "arthurhou":
ftp://arthurhou.pps.eosdis.nasa.gov/

Our Public website is located at:
https://pps.gsfc.nasa.gov/


Documentation:
https://pps.gsfc.nasa.gov/GPMprelimdocs.html
https://pps.gsfc.nasa.gov/atbd.html
https://pps.gsfc.nasa.gov/ppsfaqs.html

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