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TRMM Online Visualization and Analysis System (TOVAS)

warn_icon.gif IMPORTANT MESSAGE Jul 25, 2014    Nearing the end of the TRMM Era   

From PPS: Since December 1997, TRMM and the instruments it carries have provided valuable information to researchers, the applications community, and the public.  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.

 A small amount of fuel has been retained to conduct debris avoidance maneuvers to ensure the satellite remains safe during the drift down.

 TRMM observations will continue as the spacecraft descends to 335 km, at which time it will be shutdown prior to re-entry.

This date is nominally estimated to be February 2016, but may change depending on solar activity.  While TMI and LIS will continue operating during the entire drift down period, the TMI data will be affected. TMI incidence angle will be changing as will the field of view. Users should adjust their use of TMI data to reflect these changing values. However, we expect useful data to continue especially for non-climate research.

 JAXA has indicated that they may soon stop distribution of the radar data since useful science data is only possible within narrow altitude ranges near 400 and 350 km. When TRMM reaches 350 km (its original altitude), radar data may resume for a short period.

warn_icon.gif IMPORTANT MESSAGE Jul 23, 2014    TRMM DSC (Deep Space Calibration) Jul. 22, 2014 and TMI Data   

From PPS: TRMM underwent a DSC (Deep Space Calibration) for the TMI instrument on Tuesday July 22, 2014.  This maneuver impacted the following orbits/granules:

 95022-95027 (12:09:44 - 21:23:59 UTC)

 Please be aware that these data are being distributed as regular products and NOT empty granules replacements.

These data products also contain useful sections of DSC data as well as earth view data.


warn_icon.gif IMPORTANT MESSAGE Apr 04, 2014    TRMM Level 3 Products for February 2014   

Due to the recent hardware issue, we noticed that all TRMM Level 3 products for February 2014 were missing.  We will be processing and replacing these products shortly.  If you have a standing order/s for any of these, then you will receive another data notification for these products after they are archived.

 The products being replaced include:






& Browse.

 If you had already obtained this data, then you do not need to take any further action, since the data being replaced is identical.  We apologize for any confusion that this may cause.

 Please let us know if you have any concerns or questions.   Thank you

for your patience and understanding.



Welcome to TOVAS, a member of the Giovanni (GES-DISC Interactive Online Visualization ANd aNalysis Infrastructure) family, which provides users with an easy-to-use, Web-based interface for the visualization and analysis of global precipitation data.


Welcome to TOVAS, a member of the Giovanni (GES-DISC (Goddard Earth Sciences Data and Information Services Center) Interactive Online Visualization ANd aNalysis Infrastructure) family, which provides users with an easy-to-use, Web-based interface for the visualization and analysis of global precipitation data. See the FAQ for further usage on this tool.
Note: If you used the previous version of TOVAS, please read the following important changes:

1) The way to obtain a map for precipitation accumulated over a period has been changed in the new TOVAS. To obtain such map, select "accumulated_precipitation" from the parameter list and "Lat-Lon map, Time-accumulated" from "Select Visualization."

2) The "Lat-Lon map, Time accumulated" service is intended only for this parameter, "accumulated precipitation" or the like. Using it for other parameters may not make physical sense.

3) New output formats: HDF, NetCDF, ASCII, and Google Earth KMZ.


(*See Below for TMPA Subset ASCII Service)

Giovanni-4 Now Available: New! Please try out Giovanni-4, the next generation of Giovanni, with dramatically improved performance and interactive plotting and mapping.

Near-Real-Time Monitoring Product (For research, use Archive Data)

Satellite Rainfall Archives

Ground Observation Archives

Rainfall Product Intercomparison



TMPA Subset ASCII Service

If you are interested in subsetting and converting to ASCII the TMPA data, we have developed a new service that allows you to accomplish this through a URL call. Below is a sample of a URL and the required inputs:,-54,21,-14&TIME=2012-03-31T21:00:00%2F2012-03-31T21:00:00&FLAGS=3B42_V7,Area&SHORTNAME=3B42_V7&VARIABLES=Rain

Here are the acceptable inputs:



TIME=STARTTIME%2FENDTIME     (please retain the same format of YYYY-MM-DDTHH:MM:SS)

FLAGS=Product_version,Plot type   (plot type is ‘Area’ or ‘Time’, see next line for acceptable Product_version)

SHORTNAME=Product_version (acceptable values are the following: 3B42RT_V7, 3B42RT_Daily, 3B42_V6_Daily, 3B42_V6, 3B43_V6, 3B42_V7, 3B42_V7_Daily, 3B43_V7)

VARIABLES=variable (acceptable values is ‘Rain’ or ‘AccRain’)



Continued improvement of this online tool, and the production and dissemination of these data sets, depends on your (our users) informing us on how you have used this tool and these data. We are particularly interested in the value of this tool and these data sets to your research. Please send your comments to
Acker, J. G. and G. Leptoukh (2007).  Online analysis enhances use of NASA earth science data.  Eos, Trans., Amer. Geophysical Union, 88 (2),14, 17.
Berrick, S.W., G. Leptoukh, J.D. Farley,  and H. Rui. (2009).  Giovanni:  A Web service workflow-based data visualization and analysis system.  IEEE Trans. Geosci. Remote Sens., 47(1), 106-113.
Liu, Z., H. Rui, W. Teng, L.S. Chiu, G. Leptoukh, and G. Vicente. (2007). Online visualization and analysis: A new avenue to use satellite data for weather, climate and interdisciplinary research and applications. Measuring Precipitation from Space - EURAINSAT and the future, Advances in Global Change Research, 28, 549-558.
Liu, Z., D. Ostrenga, W. Teng,  and S. Kempler. (2012) Tropical Rainfall Measuring Mission (TRMM) Precipitation Data and Services for Research and Applications. Bulletin of the American Meteorological Society, doi:
Liu, Z., D. Ostrenga, W. Teng, S. Kempler, and L. Milich (2014), Developing GIOVANNI-based online prototypes to intercompare TRMM-related global gridded-precipitation products, Computers & Geosciences, in press, online version.
Please visit our other Giovanni Websites at the GES DISC: skip giovanni nav
Hurricane Data Analysis Tool (HDAT) :


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Last updated: Feb 27, 2014 12:37 PM ET