IMERG Early Run Example January 24th, 2020

Data

Precipitation data from the GPM and TRMM missions are made available free to the public in a variety of formats from several sources at NASA Goddard Space Flight Center. This section outlines the different types of data available, the levels of processing, the sources to download the data, and some helpful tips for utilizing precipitation data in your research.

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Frequently Asked Questions

How do I get precipitation data for my specific location?

There are several sources for downloading and viewing data which allow you to subset the data to only include specific parameters and/or geographic locations. These include the GES DISCGiovanni and STORM. In Giovanni you can obtain data for a specific country, U.S. state, or watershed by using the "Show Shapes" option in the "Select Region" pane.

What happened to the TRMM Multi-satellite Precipitation Analysis (TMPA / 3B4x) data products?

The TRMM satellilte has been decommissioned and stopped collecting data in April 2015. The transition from the Tropical Rainfall Measuring Mission (TRMM) data products to the Global Precipitation Measurement (GPM) mission products has completed as of August 2019. The GPM IMERG dataset now includes TRMM-era data from June 2000 to the present, and other TRMM-era data has been reprocessed with GPM-era algorithms and is now available on the GPM FTP servers. TMPA data production ended as of December 31st, 2019 and the TRMMOpen FTP server has been shut down. Historical TMPA data is still available to download from the NASA GES DISC at: https://disc.gsfc.nasa.gov/datasets?keywords=TMPA&page=1

Click here for more details on the transition from TMPA to IMERG. 

Am I allowed to use GPM data for my research?

Yes, in line with NASA's general data policy. Please refer to the GPM Data Policy for further details.

How do I give credit for using GPM data?
Where can I find detailed documentation on the precipitation algorithms?

Browse our directory of GPM & TRMM data products to locate your desired algorithm, then click on the links in the algorithm description under "Documentation". All documentation is also available at the Precipitation Processing System website

What is the spatial and temporal resolution of GPM data?

The resolution of Level 0, 1, and 2 data is determined by the footprint size and observation interval of the sensors involved.  Level 3 products are given a grid spacing that is driven by the typical footprint size of the input data sets.

For our popular multi-satellite GPM IMERG data products, the spatial resolution is 0.1° x 0.1° (or roughly 10km x 10km) with a 30 minute temporal resolution.

Visit the directory of GPM & TRMM data products for details on the resolution of each specific products.

Can I use images or videos from this site or other NASA websites?

For questions about permission for using NASA images and videos, please refer to NASA's official Media Usage Guidelines. For any additional questions please contact bert.ulrich@nasa.gov

Is it possible to subset GPM data?

There are several sources for downloading and viewing data which allow you to subset the data to only include specific parameters and/or geographic locations. These include the GES DISCGiovanni and STORM. In Giovanni you can obtain data for a specific country, U.S. state, or watershed by using the "Show Shapes" option in the "Select Region" pane.

What is the difference between "Near Real-time" (NRT) and "Production" / "Research" data?

GPM data products can be divided into two groups (near real-time and production) depending on how soon they are created after the satellite collects the observations. For applications such as weather, flood, and crop forecasting that need precipitation estimates as soon as possible, near real-time data products are most appropriate.  GPM near real-time (GMI & DPR) products are generally available within a few hours of observation.  For all other applications, production data products are generally the best data sets to use because additional or improved inputs are used to increase accuracy.  These other inputs are only made available several days, or in some cases, several months, after the satellite observations are taken, and the production data sets are computed after all data have arrived, making possible a more careful analysis.

For the GPM IMERG dataset, IMERG Early and Late Runs are the near real-time products, while IMERG Final Run is the research / production product. Click here to learn more about the differences between IMERG Early, Late and Final. 

The last IR file received from NOAA was on 5 January 2022 for hour 15. Since that time IT issues at NOAA have kept GPM PPS from including any IR data in the NRT Early and Late IMERG products. Users of those products should kept this impact in mind when using data beyond hour 15 on 5 Jan 2022. We have received no word from NOAA when the IR data stream will restart.
Effective approximately 01:30 UTC on 6 December V06 radar and combined data products will cease to be produced by the NRT. In the period 01:30 - 03:00 NASA and JAXA will be updating the radar products to the officially approved V07A data version. During this period no L2 Ka, Ku or DPR will be available. When radar data resumes it will be V07A which has major changes in swath organization as well as science content. The combined product is an interim product which will use V07A radar inputs but V05 GMI 1C inputs. This product is NOT the final or approved V07A combined product but does have the...
As of November 30, 2021, PPS has ceased production of GPM V06 DPR and Combined products. Starting on December 6, 2021 we will start GPM V07 processing beginning with Data date Dec 1, 2021 for GPM DPR ONLY. On December 10, 2021 we will start GPM (reprocessing) RP for V07 back to the beginning of the mission for GPM DPR ONLY. GPM GMI and Partner data will continue at the current version (V05) until February 2022 (approximately). Please note that the Combined GPM products will not be available again until February 2022. The above does not apply to GPM NRT (near real-time) processing. An...
At approximately 10:30 UTC 5 December 2021 until about 00:30 UTC 6 December. The GPM near realtime will be transitioning its software to product V07 radar products. The V07 radar products have a different format from V06. Users should point their browsers to https://pps.eosdis.nasa.gov and get the V07 file specification document that provides the new format for V07 radar products. The radiometer products will remain at their current V05 until at least February 2022. There are some format changes in the L1C V07 radiometer products and substantial changes in the GPROF data presentation. Again...
PPS will be performing crucial server updates, scheduled preventive maintenance and data product verification starting on Thursday July 01, 2021 through Thursday July 08, 2021 (Thu Jul 1, 8:00 AM EST - Thu Jul 08, 2021 Time TBD). During this period PPS will finish producing GPM data products for June 2021. GPM July 2021 production data will then be placed on hold while PPS upgrades our servers and then analyzes the GPM July data after the OS update . Please see the schedule below for the specific details and times. July 1 - 5, 2021: PPS will be closing out monthly processing for June 2021 GPM...
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