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Your search for "reflectivity" gave back 3 results.
Diagram which illustrates active and passive remote sensing
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This diagram illustrates the differences between active and passive remote sensing.  TRMM and GPM rely on active and passive instruments to measure the properties of precipitation from space.
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You will learn how we measure precipitation from the ground and from space using satellites, and why we need to do ground validation of the satellite data. You will also learn about the OLYMPEX Field Campaign.
http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=11784
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NASA and JAXA released the first images captured by their newest Earth-observing satellite, the Global Precipitation Measurement (GPM) Core Observatory, which launched into space Feb. 27, 2014.
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