TRMM Data Downloads

TRMM Mission Comes to an End

After over 17 years of productive data gathering, the instruments on TRMM were turned off on April 8, 2015. The spacecraft re-entered the Earth’s atmosphere on June 15, 2015, at 11:55 p.m. EDT, over the South Indian Ocean, according to the U.S. Strategic Command’s Joint Functional Component Command for Space through the Joint Space Operations Center (JSpOC), and most of the spacecraft was expected to burn up in the atmosphere during its uncontrolled re-entry. The Tropical Rainfall Measuring Mission (TRMM), a joint mission of NASA and the Japan Aerospace Exploration Agency, was launched in 1997 to study rainfall for weather and climate research. The multi-satellite 3B42*/TMPA product will continue to be produced through mid-2017 - learn more about  the transition from 3B42* to IMERG.

Read the TRMM end of mission frequently asked questions

 

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Geophysical parameters that have been spatially and/or temporally resampled from Level 1 or Level 2 data.

3B42 RT: 3-Hour Realtime TRMM Multi-satellite Precipitation Analysis

The system to produce the "TRMM and Other Data" estimates in real time was developed to apply new concepts in merging quasi-global precipitation estimates and to take advantage of the increasing availability of input data sets in near real time. The overall system is referred to as the real-time TRMM Multi-Satellite Precipitation Analysis (TMPA-RT), and is currently in Version 7.

Documentation:

Resolution Regions - Dates Latency Format Source DL
0.25°, 3-hour Latitudes 60°N-S, March 2000 to present 8 Hours (realtime)
3B42RT Derived Imagery
     
KML Google Earth / PMM Download
GIF GES DISC Current Conditions Download
PNG WMS Download
GIF USDA Crop Explorer Download

3B42 RT Derived Daily Product

Daily precipitation totals derived from 3B42RT. The system to produce the "TRMM and Other Data" estimates in real time was developed to apply new concepts in merging quasi-global precipitation estimates and to take advantage of the increasing availability of input data sets in near real time. The overall system is referred to as the real-time TRMM Multi-Satellite Precipitation Analysis (TMPA-RT), and is currently in Version 7. Full Documentation

Learn about the upcoming transition from TMPA (3B42x) to IMERG

Resolution Regions - Dates Latency Format Source DL
0.25° - daily Latitudes 50°N-S - March 2000 to present 8 Hours (realtime)
3B42RT Derived Imagery
     
PNG WMS Download

3B42 RT Derived 10-Day Product

10 day precipitation totals derived from 3B42RT. The system to produce the "TRMM and Other Data" estimates in real time was developed to apply new concepts in merging quasi-global precipitation estimates and to take advantage of the increasing availability of input data sets in near real time. The overall system is referred to as the real-time TRMM Multi-Satellite Precipitation Analysis (TMPA-RT), and is currently in Version 7. Full Documentation

Learn about the upcoming transition from TMPA (3B42x) to IMERG

Resolution Regions - Dates Latency Format Source DL
0.25° - 10 day Latitudes 50°N-S - October 2008 to present 10 days
3B42RT Derived Imagery
     
USDA Crop Explorer USDA Crop Explorer Download

3B42 RT Derived 30-Day Average

30 day precipitation averages derived from 3B42RT. The system to produce the "TRMM and Other Data" estimates in real time was developed to apply new concepts in merging quasi-global precipitation estimates and to take advantage of the increasing availability of input data sets in near real time. The overall system is referred to as the real-time TRMM Multi-Satellite Precipitation Analysis (TMPA-RT), and is currently in Version 7. Full Documentation

Learn about the upcoming transition from TMPA (3B42x) to IMERG

Resolution Regions - Dates Latency Format Source DL
3B42RT Derived Imagery
0.25° - daily Latitudes 50°N-S - March 2000 to present 8 Hours (realtime)

3B42 Research Version (TRMM Multi-satellite Precipitation Analysis)

The algorithm applied is the Version 7 TRMM Multi-Satellite Precipitation Analysis. For convenience, the data set is referred to in this document as the "TMPA." Note that there are other products in the general TRMM data inventory, so it is important to be specific about the product being used. The data set currently contains two products, three-hourly combined microwave-IR estimates (with gauge adjustment) and monthly combined microwave-IR-gauge estimates of precipitation computed on quasi-global grids about two months after the end of each month starting in January 1998.

Documentation:

Resolution Regions - Dates Latency Format Source DL
0.25°, 3-hour Latitudes 60°N-S, March 2000 to present 8 Hours (realtime)
0.25°, 3-hour Latitudes 60°N-S, 1998 - 2013 Annual
3B42 Derived Imagery
     
PNG WMS Download

3B42 Research Derived Daily Product

Daily precipitation totals derived from 3B42 Research Version. The algorithm applied is the Version 7 TRMM Multi-Satellite Precipitation Analysis. For convenience, the data set is referred to in this document as the "TMPA." Note that there are other products in the general TRMM data inventory, so it is important to be specific about the product being used. The data set currently contains two products, three-hourly combined microwave-IR estimates (with gauge adjustment) and monthly combined microwave-IR-gauge estimates of precipitation computed on quasi-global grids about two months after the end of each month starting in January 1998. 

Documentation:

 

Resolution Regions - Dates Latency Format Source DL
0.25° - daily Latitudes 50°N-S - January 1998 to present 2 months
3B42 Derived Imagery
     
PNG WMS Download

3B41 RT: Rain rate estimated from geosynchronous infrared instruments

The system to produce the "TRMM and Other Data" estimates in real time was developed to apply new concepts in merging quasi-global precipitation estimates and to take advantage of the increasing availability of input data sets in near real time. The overall system is referred to as the real-time TRMM Multi-Satellite Precipitation Analysis (TMPA-RT), and is currently in Version 7. Full Documentation

Learn about the upcoming transition from TMPA (3B42x) to IMERG

Resolution Regions - Dates Latency Format Source DL
0.25° - 3-hour Latitudes 60°N-S - March 2000 to present 8 Hours (realtime)

3B40 RT: Rain rate estimated from passive microwave radiometers

The system to produce the "TRMM and Other Data" estimates in real time was developed to apply new concepts in merging quasi-global precipitation estimates and to take advantage of the increasing availability of input data sets in near real time. The overall system is referred to as the real-time TRMM Multi-Satellite Precipitation Analysis (TMPA-RT), and is currently in Version 7. Full Documentation

Learn about the upcoming transition from TMPA (3B42x) to IMERG

Resolution Regions - Dates Latency Format Source DL
0.25° - 3-hour Latitudes 60°N-S - March 2000 to present 8 Hours

3B43: Multisatellite Precipitation

The algorithm applied is the Version 7 TRMM Multi-Satellite Precipitation Analysis. For convenience, the data set is referred to in this document as the "TMPA." Note that there are other products in the general TRMM data inventory, so it is important to be specific about the product being used. The data set currently contains two products, three-hourly combined microwave-IR estimates (with gauge adjustment) and monthly combined microwave-IR-gauge estimates of precipitation computed on quasi-global grids about two months after the end of each month starting in January 1998.  

Documentation:

 

Resolution Regions - Dates Latency Format Source DL
0.25° - monthly Latitudes 50°N-S, Jan. 1998 to present 2 months
0.25°, monthly Latitudes 50°N-S, 1998 - 2013 Annual
3B43 Derived Imagery
     
PNG WMS Download

3A46: SSM/1 Rain

TRMM product 3A46 consists of monthly Special Sensor Microwave/Imager (SSM/I) data averaged over 1 deg. x 1 deg. grid boxes and one month. Full documentation

Resolution Regions - Dates Latency Format Source DL
1° - monthly Latitudes 40°N-S - January 1998 to September 2009 1 month

3B31: Combined Rainfall

The TRMM 3B31 Monthly 0.5 deg. x 0.5 deg. Combined Rainfall product, contains Rain rate, rain water, snow and graupel at 28 levels for a latitude band from 40 degree N to 40 degree S. It is derived from the TRMM combined algorithm (2B31), which combines data from the TMI and PR to produce the best rain estimate for TRMM. Full documentation

Resolution Regions - Dates Latency Format Source DL
5°, monthly Latitudes 40S-40N - Jan. 1998 to present 1 month

3A26: Surface Rain Total

The primary objective of the 3A26 is to compute the rain rate statistics over 5 degree (latitude) x 5 degree (longitude) x 1 month space-time regions. The output products include the estimated values of the probability distribution function of the space-time rain rates at 4 'levels' (2 km, 4 km, 6 km, and path-averaged) and the mean, standard deviation, and probability of rain derived from these distributions. Three different rain rate estimates are used for the high resolution rain rate inputs to the algorithm: (1) the standard Z-R (or 0th-order estimate having no attenuation correction), (2) the Hitschfeld-Bordan (H-B), and (3) the rain rates taken from 2A25. (Fits based on the high resolution inputs from the surface reference technique are output to the diagnostic file for evaluation). Full documentation

Resolution Regions - Dates Latency Format Source DL
5°, monthly Latitudes 40S-40N - Jan. 1998 to present 1 month

3A25: Spaceborne Radar Rainfall

The primary objective of algorithm 3A25 is to compute various rainfall statistics over a month from the level 2 PR products. The statistics are derived at two spatial resolutions: (1) a standard space scale of 5 degrees by 5 degrees (latitude x longitude) cells and (2) a high resolution subset of 0.5 degree x 0.5 degree cells. Full documentation

Resolution Regions - Dates Latency Format Source DL
0.5°, monthly Latitudes 37S-37N - Jan. 1998 to present 1 month
5°, monthly Latitudes 40°N-S, January 1998 to present 1 month

3A12: Mean 2A12, profile and surface rainfall

Profiling. Algorithm 3A12 produces global 0.5 deg. x 0.5 deg. monthly gridded means using 2A12 data. Vertical hydrometeor profiles and surface rainfall means are computed. Various pixel counts are also reported. The granule size is one month.This document provides basic information on 3A12, TMI Monthly 0.5 deg. x 0.5 deg. Profiling. Algorithm 3A12 produces global 0.5 deg. x 0.5 deg. monthly gridded means using 2A12 data. Vertical hydrometeor profiles and surface rainfall means are computed. Various pixel counts are also reported. The granule size is one month. Full documentation

Resolution Regions - Dates Latency Format Source DL
0.5°, monthly   1 month

3A11: Oceanic Rainfall

The TMI Gridded Oceanic Rainfall Product, also known as TMI Emission, consists of 5 degree by 5 degree monthly oceanic rainfall maps using TMI Level 1 data as input. Statistics of the monthly rainfall, including number of samples, standard deviation, goodness-of-fit (of the brightness temperature histogram to the lognormal rainfall distribution function) and rainfall probability are also included in the output for each grid box. Spatial coverage is between 40 degrees North and 40 degrees South owing to the 35 degree inclination of the TRMM satellite. Full documentation

Resolution Regions - Dates Latency Format Source DL
5°, monthly Latitudes 40°N-S, January 1998 to present 1 month

Derived geophysical parameters at the same resolution and location as those of the Level 1 data.

2B31: Combined Rainfall Profile (PR, TMI)

2B31, ”TRMM Combined”, derives vertical hydrometeor profiles using data from PR radar and TMI. It also computes the correlation-corrected mass-weighted mean drop diameter and its standard deviation, and latent heating. Full Documentation

Resolution Region - Dates Latency Format Source DL
5 km x 5 km, 16 orbits per day Orbital, available past ~7 days since acquisition 3 Hours (Realtime)
5 km x 5 km, 16 orbits per day Orbital, available past ~7 days since acquisition 2 days (Production)
5 km x 5 km, 16 orbits per day Orbital (Latitudes 38°N-S, December 07 1997 to present) ~5 Days

2A25: Precipitation Radar Rainfall Rate and Profile

2A25, ”PR Profile”, produces an estimate of vertical rainfall rate profile for each radar beam. The rainfall rate estimate is given at each resolution cell of the PR radar. To compare with ground-based radar data, the attenuation corrected Z profile is also given. The average rainfall rate between the two pre-defined altitudes is calculated for each beam position. Other output data include parameters of Z-R relationships, integrated rain rate of each beam, range bin numbers of rain layer boundaries, and many intermediate parameters. Full Documentation

Resolution Region - Dates Latency Format Source DL
5 km x 5 km - 16 orbits per day Orbital, available past ~7 days since acquisition 3 hours (Realtime)
5 km x 5 km - 16 orbits per day Orbital, available past ~7 days since acquisition 2 Days (production)
5 km x 5 km - 16 orbits per day Orbital (Latitudes 38°N-S, December 07 1997 to present) ~5 Days

2A23: Precipitation Radar Rain Characteristics

PR 2A23 produces a rain/no-rain flag. Its main objectives are (1) to detect bright band (BB), (2) to classify rain type, and (3) to detect warm rain. 2A23 uses two different methods for classifying rain type: (1) vertical profile method (V-method) and (2) horizontal pattern method (H-method). Both methods classify rain into three categories: stratiform, convective, and other. To make the results user-friendly, 2A23 outputs a unified rain type. Further information about 2A23 can be found in Awaka et al. (1998). . Full Documentation

Resolution Region - Dates Latency Format Source DL
5 km x 5 km - 16 orbits per day Orbital, available past ~7 days since acquisition 3 hours (Realtime)
5 km x 5 km - 16 orbits per day Orbital, Latitudes 38°N-S, December 07 1997 to present 2 Days (production)
5 km x 5 km - 16 orbits per day Orbital (Latitudes 38°N-S, December 07 1997 to present) ~5 Days

2A21: Precipitation Radar Surface Cross-Section

The primary objective of the 2A21 is to compute the path integrated attenuation (PIA), using the surface reference technique (SRT). The SRT relies on the assumption that the difference between the measurements of the normalized surface cross section within and outside the rain provides a measure of the PIA. Full Documentation

Resolution Region - Dates Latency Format Source DL
5 km x 5 km - 16 orbits per day Orbital, available past ~7 days since acquisition 3 hours (Realtime)
5 km x 5 km - 16 orbits per day Orbital, Latitudes 38°N-S, December 07 1997 to present 2 Days (production)
5 km x 5 km - 16 orbits per day Orbital (Latitudes 38°N-S, December 07 1997 to present) ~5 Days

2A12: TMI Hydrometeor Profile

Full Documentation

Resolution Region - Dates Latency Format Source DL
5 km x 5 km - 16 orbits per day Orbital, available past ~7 days since acquisition 3 hours (Realtime)
5 km x 5 km - 16 orbits per day Orbital, Latitudes 38°N-S, December 07 1997 to present 2 Days (production)
5 km x 5 km - 16 orbits per day Orbital, Latitudes 38°N-S, December 07 1997 to present ~15 Days

Level 1A: Reconstructed, unprocessed instrument data at full resolution, time referenced, and annotated with ancillary information, including radiometric and geometric calibration coefficients and georeferencing parameters (i.e., platform ephemeris), computed and appended, but not applied, to Level 0 data.

Level 1B: Radiometrically corrected and geolocated Level 1A data that have been processed to sensor units..

1C21: Precipitation Radar Reflectivity

The PR Level-1C product, 1C21, "PR Reflectivities," is written as a Swath Structure. Full Documentation

Resolution Region - Dates Latency Format Source DL
5 km x 5 km - 16 orbits per day Orbital, available past ~7 days since acquisition 3 hours (Realtime)
5 km x 5 km - 16 orbits per day Latitudes 38°N-S - December 07 1997 to present 2 days (Production)
5 km x 5 km - 16 orbits per day Latitudes 38°N-S - December 07 1997 to present ~15 days

1B21: Precipitation Radar Power

The 1B21 calculates the received power at the PR receiver input point from the Level-0 count value which is linearly proportional to the logarithm of the PR receiver output power. To convert the count value to the input power, extensive internal calibrations are applied, which are mainly based upon the system model, temperature dependence of model parameters and many temperature sensors attached at various locations of the PR. Periodically the input-output characteristics are measured using an internal calibration loop for the IF unit and later receiver stages. To make an absolute calibration, an Active Radar Calibrator (ARC) is placed at Kansai Branch of CRL and overall system gain of the PR is being measured every 2 months. Using the transfer function based on the above internal and external calibrations, the PR received power is obtained. Note that the value assumes that the signal follows the Rayleigh fading, so if the fading characteristics of a scatter is different, a small bias error may occur (within 1 or 2 dB). Full Documentation

Resolution Region - Dates Latency Format Source DL
5 km x 5 km - 16 orbits per day Orbital, available past ~7 days since acquisition 3 hours (Realtime)
5 km x 5 km - 16 orbits per day Latitudes 38°N-S - December 07 1997 to present 2 days (Production)
5 km x 5 km - 16 orbits per day Latitudes 38°N-S - December 07 1997 to present ~15 days

1B11: Microwave Brightness Temperature

The Level 1B product file (1B11) contains calibrated brightness temperatures and auxiliary geolocation information for each pixel in the scan. The structure of the Level 1B data file is based on the Wentz format for the SSM/I data. The Level 1B data are stored in the Hierarchical Data Format (HDF), which includes both core and product specific metadata applicable to the TMI measurements. A file contains a single orbit of data with a file size of about 14 MB (uncompressed). The HDF-EOS "swath" structure is used to accommodate the actual geophysical data arrays. As in the case of the Level 1A data, there are 16 files of TMI 1B11 data produced per day. Full Documentation

Resolution Region - Dates Latency Format Source DL
5 km x 5 km - 16 orbits per day Orbital, available past ~7 days since acquisition 3 hours (Realtime)
5 km x 5 km - 16 orbits per day Latitudes 38°N-S - December 07 1997 to present 2 days (Production)
5 km x 5 km - 16 orbits per day Latitudes 38°N-S - December 07 1997 to present ~5 days

1B01: Visible and Infrared Radiance

The Level 1B product file (1B01) contains calibrated radiances and auxiliary geolocation information for each pixel in the scan. The Level 1B data are stored in the Hierarchical Data Format (HDF), which includes both core and product specific metadata applicable to the VIRS measurements. A file contains a single orbit of data with a file size of about 87 MB (uncompressed). The HDF-EOS "swath" structure is used to accommodate the actual geophysical data arrays. As in the case of the Level 1A data, there are 16 files of VIRS 1B01 data produced per day. Full Documentation

Resolution Region - Dates Latency Format Source DL
5 km x 5 km - 16 orbits per day Latitudes 38°N-S, December 20 1997 to March 21 2014 -