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TRMM Microwave Imager (TMI) Gridded Oceanic Rainfall Product (TRMM Product 3A11)

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Abstract: The Tropical Rainfall Measuring Mission (TRMM) is a joint U.S.-Japan satellite mission to monitor tropical and subtropical precipitation and to estimate its associated latent heating. TRMM was successfully launched on November 27, at 4:27 PM (EST) from the Tanegashima Space Center in Japan.

The TRMM Microwave Imager (TMI) is a nine-channel passive microwave radiometer, which builds on the ... View entire text
Related URL
Description: Access the data via FTP.
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Multimedia Sample
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Caption:  3A11 TMI oceanic monthly accumulated surface rainfall, 2005/11/01-2005/12/01
Description:  Sample image for TRMM data product 3A11, TMI oceanic monthly accumulated
surface rainfall, 2005/11/01-2005/12/01

Geographic Coverage
Spatial coordinates   
  N: 40.0   S: -40.0   E: 180.0   W: -180.0

Data Set Citation
Dataset Originator/Creator: NASA,JAXA, Tropical Rainfall Measuring Mission (TRMM)
Dataset Title: TRMM Microwave Imager (TMI) Gridded Oceanic Rainfall Product (TRMM Product 3A11)
Dataset Series Name: TRMM_3A11
Dataset Release Date: July 2011
Dataset Release Place: Greenbelt, MD
Dataset Publisher: Goddard Space Flight Center Distributed Active Archive Center (GSFC DAAC)
Version: 7
Online Resource:
Temporal Coverage
Start Date: 1997-12-01
Stop Date: 2015-03-31
Data Resolution
Latitude Resolution: 5 degrees
Longitude Resolution: 5 degrees
Horizontal Resolution Range: 500 km - < 1000 km or approximately 5 degrees - < 10 degrees
Vertical Resolution: Surface
Temporal Resolution: Monthly
Temporal Resolution Range: Monthly - < Annual
Quality Quality arrays have been set aside in the files to be populated in the future, once the characteristics of the sensor become better understood and enhancements are made to the science algorithms. Quality indicators will be available for each 5 degree gridbox in the monthly rainfall map.
Access Constraints None
Data Set Progress
Originating Center
Data Center
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA Supplemental Info
Data Center URL:

Data Center Personnel
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Distribution Media: FTP
Distribution Size: increasing monthly
Distribution Format: HDF
Fees: none
Email: lchiu at
Contact Address:
Building ST-1 Room 211
George Mason University
City: Fairfax 22030-4444
Province or State: VA
Postal Code: 22030-4444
Country: USA
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File Specifications for TRMM Products:

Metadata for TRMM Products:

TRMM V6 vs. V7 Major Data Format Changes:

Wilheit, T.T., A.T.C Chang and L.S. Chiu, 1991: Retrieval of Monthly Rainfall Indices from Microwave Radiometric Measurements Using Probability Distribution Functions. J. Atmos. Oceanic Tech., 8, 118-136.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2011-07-19
Last DIF Revision Date: 2016-01-20
Future DIF Review Date: 2016-07-31