Past PPS News and Updates (TRMM, GPM, and Partner Data) ----------------------------------------------------------- -August 26, 2015: A new gridded text product that contains GPROF precipitation data from the GPM partner cross-track scanning radiometers (sounders) has been released. You can find the documentation for the Summary Information for the GPM Constellation Crosstrack-Scanning Radiometers as Quarter-degree Gridded Test Product (Here): https://pps.gsfc.nasa.gov/Documents/partnerSoundersGriddedText.v3.pdf These Products can be ordered through STORM: https://storm.pps.eosdis.nasa.gov/ and retrieved via PPS's FTP archive after completing a quick and mandatory registration process: ftp://arthurhou.pps.eosdis.nasa.gov/ ----------------------------------------------------- -April 15, 2015: The TRMM spacecraft was deactivated on 2015-04-15 (S/C passivation),with the last telemetry occurring at 16:37:27 UT (12:37 EDT or 04-16 at 01:37 JST). After over 17 years of productive data gathering, the PR instrument on TRMM was turned off on April 01, 2015, the TMI and LIS instruments were turned off on April 08, 2015 and the spacecraft will slowly descend from its orbit. For more information Read the Frequently Asked Questions about TRMM's Descent: https://pmm.nasa.gov/index.php?q=mission-updates/data-news/trmm-spacecraft-re-entry ------------------------------------------------------------------------------- -February 18, 2015: TRMM/PR data distribution resumes during the experimental operation period. The satellite has descended to an altitude of around 350 km on February 12, 2015, which is the original nominal altitude before 2001. Verification of the data quality concluded and JAXA and PPS started distribution of PR data around the 350 km altitude (orbit number from 98231) to the public. PR available data period around 350 km altitude will be about 40 days since February 12, 2015. Please see TRMM/PR data distribution for further information and for the data locations. ------------------------------------------------------------------------------------------ -January 21, 2015: PPS is re-releasing the first public version IMERG products The Integrated Multi-satellitE Retrievals for GPM (IMERG) merges precipitation estimates from passive microwave sensors, geo-IR, and monthly surface precipitation gauge analysis data (where available) to provide half-hourly and monthly precipitation estimates and related fields on a 0.1° lat./long. grid over the domain 60°N-S. The current period of record is mid-March 2014 to the present (delayed by about 3 months) .Please refer to the IMERG Release notes (http://pps.gsfc.nasa.gov/Documents/IMERG_EarlyRun_Day1_release_notes.pdf) , the technical IMERG document (http://pps.gsfc.nasa.gov/Documents/IMERG_doc.pdf) and the IMERG Algorithm Theoretical Basis Document (http://pps.gsfc.nasa.gov/Documents/IMERG_ATBD_V4.4.pdf) for complete details. -------------------------------------------------------------------------------------------------------- -January 16, 2015: PPS has removed all IMERG products from the "arthurhou" ftp site. We've discovered an inconsistency between the metadata and the actual "missing" fill values for some of the IMERG data fields. [This mistake arose in the process of changing these data fields to accommodate limitations in the GRADS analysis package.] As a result, we are choosing to retract the just-released IMERG Final Run data and re-compute them with consistent "missing" fill values. The new release will occur early next week. Our apologies for the hiccup in the release process. We regret any inconvenience or problem that this may have caused. ------------------------------------------------------------------------------ -January 15, 2015: PPS is releasing the first public version IMERG products The Integrated Multi-satellitE Retrievals for GPM (IMERG) merges precipitation estimates from passive microwave sensors, geo-IR, and monthly surface precipitation gauge analysis data (where available) to provide half-hourly and monthly precipitation estimates and related fields on a 0.1° lat./long. grid over the domain 60°N-S. The current period of record is mid-March 2014 to the present (delayed by about 3 months) .Please refer to the IMERG Release notes: http://pps.gsfc.nasa.gov/Documents/IMERG_FinalRun_Day1_release_notes.pdf the technical IMERG document: http://pps.gsfc.nasa.gov/Documents/IMERG_doc.pdf and the IMERG Algorithm Theoretical Basis Document for complete details. http://pps.gsfc.nasa.gov/Documents/IMERG_ATBD_V4.4.pdf -------------------------------------------------------------------------------------------------------- -November 15, 2014: TRMM conducted once-in-a-mission maneuvers from November 15th thru November 25th. These 90° Yaw maneuvers were conducted 4 times per day for 11 days straight to allow the Precipitation Radar (PR) Instrument to view precipitation “sideways” for the first time in the 17 year mission. This valuable data will be used to calibrate the entire TRMM/PR data set. -------------------------------------------------------------------------------------------------------- -October 09, 2014: TRMM is decending and the users of TRMM PR data should be aware that the last production orbit of public PR data will be orbit #96230 on data date Oct. 7, 2014. After this time the TRMM PR data is restricted. TRMM TMI data will continue to be produced and publicly available during the descent of the spacecraft until it reaches its decommissioning altitude of 335km ------------------------------------------------------------------------------------------------------ -September 15, 2014: GPM Combined data products: It was determined that the CMB L2 V03B products for public release on 9/8/2014 were affected by a precipitation profile top detection that was too conservative, resulting in artifacts in the precipitation profile structure near the profile top. The top detection is corrected in the CMB L2 V03C products released 9/15/14, resulting in more realistic precipitation structures near the profile top. Please see the following Combined Caveats: http://pps.gsfc.nasa.gov/Documents/CombinedCaveats.pdf ------------------------------------------------------------------------------------------------ -September 02, 2014: PPS will commence reprocessing of all GMI and DPR standard products. Additionally, AMSR2 data will be reprocessed for L1C-L3 back to February 2014. As of the September 02, 2014 release all GPM and partner data processed is listed in this table "http://pps.gsfc.nasa.gov/Documents/gpm_partner_data_ver_09_02_14.txt" including the product versions available for public distribution. Please also refer to the GPM DPR L1 and L2 Caveats "http://pps.gsfc.nasa.gov/Documents/Caveats_DPRL1L2_product_201409final.pdf", the GPROF_2014_Caveats: "http://pps.gsfc.nasa.gov/Documents/GPROF_2014_Caveat.pdf" and these important GPM GMI and PartnerL1 Caveats "http://pps.gsfc.nasa.gov/Documents/GMIL1Caveat.pdf" for all details. PPS will cease population of the /emdata and /pmmdata data trees on the ftp site. All data products will be available from the public tree on arthurhou.pps.eosdis.nasa.gov under /gpmdata. Please refer to this description of the public data trees: "http://pps.gsfc.nasa.gov/Documents/gpmdataTree.txt". If you have a subscription through STORM and use the provided ftp scripts this change will be transparent and you should not need to revise your data retrievals. However, if you have written your own custom scripts to retrieve data please ensure that these are updated to use the public tree. If your scripts are based off the daily manifest please ensure that you are retrieving the manifest from the public tree. -------------------------------------------------------------------------------------------------------- -July 28, 2014: On July 8, 2014, pressure readings from the fuel tank indicated that TRMM is at the end of its fuel. As a result, NASA has ceased station keeping maneuvers and TRMM has begun its drift downward from its operating altitude of 402 km. Please read "Nearing the end of the TRMM Era" (http://pps.gsfc.nasa.gov/Documents/Nearing%20the%20end%20of%20the%20TRMM%20Era.pdf) for important details. ------------------------------------------------------------------------------------------------------ -July 14, 2014: PPS has released GPM and partner Level 2 (GPROF-GMI) data to the General Public. This data is now available for registered users through FTP and the PPS STORM web interface. Please refer to the GPROF_2014_Caveats: "http://pps.gsfc.nasa.gov/Documents/GPROF_2014_Caveat.pdf" for details and also see this GPM data access document "http://pps.gsfc.nasa.gov/Documents/GPM_Data_Info_140616.pdf" for information on how to register and on the directory structure. ---------------------------------------------------------------------------------------------------------------- -June 16, 2014: PPS has released GPM Level 1 GMI and Partner Radiometer data to the General Public. The data is now available unrestricted for registered users through FTP and the PPS STORM web interface. Please refer to these important Caveats "http://pps.gsfc.nasa.gov/Documents/GPM_L1radiometer_public_caveats.pdf" for GPM Level1 details and also see this document: "http://pps.gsfc.nasa.gov/Documents/GPM_Data_Info.pdf" for information on how to register "http://registration.pps.eosdis.nasa.gov/registration/" and on the directory structure. The data is available from PPS STORM (PPS's Data Ordering Interface) Please go to: https://storm-pps.gsfc.nasa.gov/storm/ ----------------------------------------------------------------------------------------------------- -March 21, 2014: Due to a battery charging anomaly on the TRMM satellite, it has become necessary to initiate load shedding. The VIRS instrument was powered off to conserve power and to extend the life of the two other prime TMI and PR instruments. ------------------------------------------------------------------------------------------------ -December 04, 2014: PPS has begun producing updated GPM radiometer products as of 12/4/2014 due to an error discovered in the calculation of the Sun Angle in the PPS Geolocation Toolkit. This is considered a minor update with the Product Version being incremented in letter only : See list of affected products here http://pps.gsfc.nasa.gov/Documents/GPM_PPS_SunAngle_Products_20141204.pdf  For most radiometers the Sun Angle is used as ancillary information but for TRMM TMI the correction also slightly impacts brightness temperature and precipitation retrievals. See our preliminary analysis of the impact on retrievals document for details: http://pps.gsfc.nasa.gov/Documents/SunErrorMemo_20141204.pdf There are no plans at this time to reprocess GPM data due to this issue. In addition, there are no plans to correct this error in the TRMM data stream at this time (ex: 1B11/2A12 TRMM products). -------------------------------------------------------------------------------------------------------- -Due to spacecraft attitude issues, PPS has replaced the TRMM PR Orbits: 91110 (11/13/2013) through 91140 (11/15/2013) with empty granules for 1C21 through 2A25 data at the request of PR team. This will ensure that anomalous precipitation retrievals in those orbits do not flow into any Level 3 products. The 1B21 data for those orbits will remain in the system as they do have some meaningful data however, the spacecraft attitude was not nominal during periods of those orbits. The TRMM data types that were re-generated are: 1C21, 2A21, 2A23, 2A25, 2B31, 2H25, 2H31, 3G25, 3G31 and 3G68. If you have obtained any of these TRMM data products for these dates prior to the processing date of 11/22/2013, please discard them and retrieve the reprocessed data. (Posted 11/23/2013) ----------------------------------------------------------------------------------------------- -Due to an error where AMSU data was excluded in the first retrospective processing of Version 7 TMPA (3B42/43) and TMPA-RT (3B40/41/42RT) data, PPS has rolled back and replaced these data products including Browse and TRMM GIS for January 2000 through September 2010. If you have obtained any 3B4X, etc. data from the PPS ftp data archive or through a Standing Order/s, please discard this data and use the improved products. Please note that these replacement products will have the designation 7A for the January 2000 through September 2010 3B4X products. For Example: 3B42.20000101.00.7A.HDF, 3B43.20000101.7A.HDF We apologize for any inconvenience that this correction may cause and appreciate your patience and understanding. ----------------------------------------------------------------------------------- -TRMM PPS Near-Realtime (NRT) Version 7 data products are available starting with June 01, 2012 merged data products.These products can be found in the trmmopen ftp public data archives -------------------------------------------------------------------------------------- -TRMM Version 7 3B42 and 3B43 data products are now available to our Science Users as well as to the general public. ftp://pps.gsfc.nasa.gov/pub/trmmdata/ It is important to be aware that initial 3B4X V7 TRMM data product availability will be delayed for a period of 2 to 3 months. For example; the 3B42 and 3B43 V7 products for May 2012 would not be available until August 2012 due to the extra inputs, variables and quality control measures. Re-processed Version 7 TRMM 3B4X products are available through our TRMM Public Data Archive as noted (above):and will also be distributed through individual data orders. -------------------------------------------------------------------------------