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TRMM Online Visualization and Analysis System (TOVAS)

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.



warn_icon.gif IMPORTANT MESSAGE Mar 28, 2014    VIRS to stay off   

From PPS: At a meeting of the FOT and power engineers, the battery anomaly was discussed.  Because of the load shedding made possible by turning off VIRS, battery 1 is fully recovered.  Both battery 1 and battery 2 are charging nominally.  Battery 2 is running at a higher temperature than before. There was still some concern expressed that if VIRS was turned on, then during certain orbits and certain beta angles, the charging anomaly might reoccur.

 Discussion followed concerning the effect of potentially having to turn VIRS on and off (as a load shedding approach during certain times) on remaining battery life.  With a 16 plus year old battery, this now may become the limiting factor on a longer TRMM mission.

 Since the prime science goal is to keep the 2 prime instruments (TMI and PR) working as long as possible,  the key goal seems to be to lessen the load on the battery.  So we need to minimize the possibilities of further anomalies, lower the battery charging load, and generally decrease demand on the batteries.  As a result, the science team made the decision at this time to keep VIRS turned off.

 We would be interested in hearing from users what the impact this has on you and your research.  Also, we would welcome TRMM science user's input as to the effect of this VIRS outage on their work vs. the desirability of extending operation of TMI and PR.

 We do want our users to know there is no absolute analytical way to determine the remaining life in the batteries.  Also, there is no analytical way to establish how much additional life would be added by the battery load reduction but there was general consensus among the experts that it would increase the life of the battery.

The Flight Operations Team and power specialists will continue to monitor the battery.

The power team is also going to look at life cycle testing done during TRMM development to see what, if anything that might add to the understanding of the on-board battery remaining capacity.

 Accordingly, the TRMM science team has made the decision that for the time being, the VIRS instrument will remain off.


 IMPORTANT MESSAGE Mar 26, 2014    Update on VIRS and battery anomaly

From PPS: The battery situation aboard TRMM has stablized with the loadshedding.

Currently both batteries are in a nominal state. The FOT is studying other possible ongoing load shedding activities short of turning off an instrument. They are also studying the proper procedures for turning on VIRS (this hasn't been done since 2001).

 The current plans call for VIRS to be turned on sometime next week. The batteries will then be monitored to see if charging remains nominal. Should charging anonmalies appear again, it will be necessary to shutdown VIRS again.


IMPORTANT MESSAGE Mar 24, 2014    Important: VIRS has been turned off for the time being

From PPS: Due to a battery charging anomaly on TRMM, VIRS has been turned off (3/21

17:02 UTC)  as part of a load shedding approach for dealing with the

charging anomaly.


This approach seems to be working well as battery charging is returning to



TMI, PR and LIS remain on and continue to provide NRT data.


Note will be sent out when the situation changes.

warn_icon.gif IMPORTANT MESSAGE May 14, 2013    IMPORTANT: Rollback and Replacement of TRMM VIRS Data Products for May 12, 2013 (DOY 132)   

From PPS:

PPS was informed by PACOR after TRMM data production for May 12, 2013 had finished and products were made available, that there was missing data in the level zero VIRS file for that day (DOY 132). A replacement version with the recovered data was was made available and PPS used this improved version to generate replacement files.

If you have obtained any 1A01 and downstream TRMM data products earlier today (see list below) through our data archive or via Standing Order, etc., please discard these products and use the newer replacement file versions. The replacement files should have a time stamp of approx 19:16 etc.

TRMM data replaced for May 12, 2013 include the following:

1A01, 1B01, 1B01BR, 1B01QA, 1B01_C, 1B01_TREND, 3G01-4, 3G01-5, EGscan, FireMonth, FireDay, FireDayPlot, FireMonthPlot, UtahDay, UtahZ

If you have questions or concerns, please contact us,

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