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Launched by NASA and JAXA in 1997, TRMM carries the first on-orbit active/passive instrument package to study the intensity and structure of tropical rainfall. Get data

An international satellite mission launched by NASA and JAXA on Feb. 27, 2014, that will set new standards for precipitation measurements worldwide using a network of satellites united by the GPM Core Observatory. Get data


The Precipitation Processing System (PPS) has begun producing updated GPM radiometer products as of 12/4/2014 due to an error discovered in the calculation of the Sun Angle in the PPS Geolocation...
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TRMM image of the Earth displaying the last 3 hours of global rainfall accumulation

GPM Data

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Precipitation data from the GPM and TRMM missions is made available free to the public in a variety of formats from several sources. 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. 


The GPM Core Observatory successfully launched from Tanegashima Space Center, Japan, at 1:37pm EST on February 27th 2014. Use these resources to stay updated on GPM news and help celebrate this historic occasion.


Photos and videos that tell the story of the Precipitation Measurement Missions. Watch the GPM Core Observatory being built and tested at NASA Goddard, learn about the science of measuring precipitation, and more.


Through an advanced set of instruments, TRMM and GPM provide new information on precipitation characteristics and how rain and snow interact within the Earth system. This section explores how space-borne precipitation measurements are acquired, processed, and utilized.