The Global Precipitation Measurement (GPM) mission is one of the next generation of satellite-based Earth science missions that will study global precipitation (rain, snow, ice). |
Why Measure Rainfall from Space?
The comprehensive measurement of precipitation is valuable for a wide range of research areas and related applications with practical benefits for society. However, precipitation is difficult to measure because precipitation systems tend to be somewhat random in character and also evolve very rapidly.
Within a single storm, it is not uncommon for precipitation amounts to vary widely over a very small area. Also, in any given area, the amount of precipitation can vary significantly over a short time span. In the summertime, for instance, a single thunderstorm lasting just 20 minutes will produce 2 inches of rain over a city, but leave the adjacent town just 10 miles away unscathed. During the winter, heavy snows downwind of the U.S. Great Lakes often accumulate to several feet, but along a narrow corridor only a few tens of miles wide.
All of these factors make precipitation difficult to quantify. Reliable ground-based precipitation measurements are difficult to obtain over regional and global scales because most of the world is covered by water and many countries are not equipped with precision rain measuring sensors (i.e., rain gauges and/or radars). It might be possible to study precipitation over a small area using ground-based data, but rarely beyond that. The only practical way to obtain useful regional and global scale precipitation measurements is from the vantage point of a space-based remote sensing instrument.
![TRMM rainfall measurements](https://webarchive.library.unt.edu/eot2008/20090825044405im_/http://gpm.gsfc.nasa.gov/images/features/measurerainfall_2.gif) |
![TRMM rainfall measurements](https://webarchive.library.unt.edu/eot2008/20090825044405im_/http://gpm.gsfc.nasa.gov/images/features/measurerainfall_3.gif) |
All images above show the Earth's rainfall measurements taken from NASA's TRMM satellite.
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Mission Status
GPM is in the Formulation Phase
Successfully completed the GPM Mission Preliminary Design Review (PDR) November 10-13, 2008
Launch Date(s)
Core spacecraft : July 21, 2013
Low-inclination spacecraft : Nov. 2014
Newsroom
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![Water for Tea Movie](https://webarchive.library.unt.edu/eot2008/20090825044405im_/http://gpm.gsfc.nasa.gov/images/gallery/Water_for_Tea1.gif) |
Water for Tea The high-tech GPM Mission grabs viewers' attention through images of teacups and teapots.
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![Promise Of Rain Movie](https://webarchive.library.unt.edu/eot2008/20090825044405im_/http://gpm.gsfc.nasa.gov/images/gallery/promiseofrain.jpg) |
The Promise Of Rain Consider your relationship to precipitation and how it affects our lives.
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![](https://webarchive.library.unt.edu/eot2008/20090825044405im_/http://gpm.gsfc.nasa.gov/images/gallery/multicolor_swaths.gif) |
GPM Constellation Swath
Animation showing swath widths on the ground.
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![GPM Brochure](https://webarchive.library.unt.edu/eot2008/20090825044405im_/http://gpm.gsfc.nasa.gov/images/brochurelink.jpg) |
GPM Brochure "An International Partnership Mission to Understand Global Precipitation and Its Impact on Humankind"
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