Data News


On the afternoon of March 16, one of the TDRSS data relay satellites went into safe hold. This has reduced the relay satellites available for downloading the data from the GPM core satellite to the ground station at White Sands, NM.  It means that times between download contacts have increased.

No data is lost but data latency has been greatly affected for the GPM near-realtime core satellite products: GMI and DPR. We understand that this increase in latency will be the norm for the next couple of days.  There are NO issues with the GPM core satellite or its sensors. Also there are NO issues with the GPM ground system, data system, or network. 

When the TDRSS satellite situation is rectified the NRT latencies will return to normal.

Please contact us for any questions. 

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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. 

For IMERG late the V03 products have remained before February 05, 2017. For IMERG early V03 products remain before March 12 hour 14. 

The GIS friendly TIFF/TFW late products are available from Feb 5, hour 00 through Feb 28, hour 23.  We are in the process of catching up to ensure that TIFF/TFW late products are at V04 for the entire period of Feb 5, hour 00 to the current time. This will take several more days.  

IMERG GIS early TIFF/TFW are available in V04 from March 12 hours 16:00 forward. During the next week we will work on creating TIFF/TFW early products at V04.

Version 04 supersedes all prior IMERG versions, and users are urged to shift to the new datasets as soon as practical.

Release notes and other documentation for IMERG V04 are available on the NRT ftp site: ftp://jsimpson.pps.eosdis.nasa.gov  in the directory: /NRTPUB/documentation.

Please contact us for any questions regarding this transition. 

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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.

Version 04 supersedes all prior IMERG versions, and users are urged to shift to the new datasets as soon as practical.

The TIFF/TFW version of IMERG and all its accumulations will also be transitioned to use the V04 IMERG product.

Release notes and other documentation for IMERG V04  will be available on the NRT ftp site in the directory: ftp://jsimpson.pps.eosdis.nasa.gov/NRTPUB/documentation

Please contact us for any questions regarding this transition.
 

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The Goddard Earth Sciences Data and Information Services Center (GES DISC) will soon be completing its transition from FTP access to HTTPS access using NASA Earthdata Login.  This transition will require GES DISC users to register with NASA Earthdata Login if they haven't already done so.

To learn more about NASA Earthdata Login and registering for an account, please see https://wiki.earthdata.nasa.gov/display/EL/How+To+Register+With+Earthdata+Login

GES DISC will begin this transition starting Feb 13 2017, and expects to complete the transition mid-March.

Users who currently access GES DISC data via FTP through scripts will have to adjust those scripts to use HTTPS access using NASA Earthdata Login.  Information regarding the latter may be found here: https://disc.gsfc.nasa.gov/recipes/?q=recipes/How-to-Download-Data-Files-from-HTTPS-Service-with-wget

If you have any additional questions, please contact the GES DISC Help Desk at gsfc-help-disc@lists.nasa.gov.

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Anomalies in the DMSP F-16 input data for the TMPA-RT created streaks of precipitation over open-ocean regions. We have now deleted faulty data and rerun the TMPA-RT for the period:

18 December 2016 at 09 UTC to 19 December 2016 at 18 UTC.

Please re-pull the affected data files.

There appears to be no corresponding issue with the IMERG data files due to different quality control routines.
 

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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

2A.GPM.Ka.V6-20160118.20161217-S163139-E180413.015932.V04A.HDF5
2A.GPM.Ku.V6-20160118.20161217-S163139-E180413.015932.V04A.HDF5
2A.GPM.DPR.V6-20160118.20161217-S163139-E180413.015932.V04A.HDF5
2B.GPM.DPRGMI.CORRA2015.20161217-S163139-E180413.015932.V04A.HDF5
2B.GPM.DPRGMI.2HCSHv2-1.20161217-S163139-E180413.015932.V04A.HDF5
2A.GPM.DPR.GPM-SLH.20161217-S163139-E180413.015932.V04A.HDF5
3B-ORBIT.GPM.DPRGMI.3GCSHv2-1.20161217-S163139-E180413.015932.V04A.HDF5
3A-ORBIT.GPM.DPR.GPM-SLH.20161217-S163139-E180413.015932.V04A.HDF5

We apologize for any inconvenience this may have caused.  Please contact us if you have any questions or concerns. 

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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.

An update will be provided here when the corrected products are ready. 

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/

and STORM:

https://storm.pps.eosdis.nasa.gov/storm/

The GPM science team discovered that the IMERG final products for Jan 2016 and the Jan-Jun 2016 TMPA 3B42/3B43 products for which we merge the multi-satellite product with gauge analysis over land contained an error.  For 2016, the gauge was erroneously not included (input from GPCC), therefore over land, the estimates are purely multi-satellite.  Please note that this error doesn't affect estimates over the ocean.

As a result, we are choosing to retract and replace the 2016 January (only) IMERG and 2016 January through June 2016 3B42/3B43TMPA products.   The 2016 3B42/3B43 TMPA data is being reprocessed currently and should be available soon.

If you have acquired any of the 2016 IMERG or TMPA products mentioned above either through Standing Orders or other method; please discard these and replace them with the newly regenerated products.

We regret any inconvenience or problem that this may have caused.  If you have any questions, comments or concerns, please do not hesitate to contact us.
 

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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.

Note:
If you wish to continue using KML files with a non-Google Earth client, please contact the Precipitation Measurement Missions at: https://pmm.nasa.gov/contact 

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.

You will be informed when PPS systems become available. We apologize for any inconvenience this may cause.
 

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