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- Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Active imaging radar systems solve this problem. Active sensors like those aboard the European Space Agency's ERS and Envisat, India's RISAT, and Canada's Radarsat, among others, transmit pulses of longwave radiation, then measure the intensity and travel time of those pulses after they are reflected back to space from the Earth's surface.www.e-education.psu.edu/natureofgeoinfo/node/1890By recording the range and magnitude of the energy reflected from all targets as the system passes by, a two-dimensional image of the surface can be produced.www.earthdata.nasa.gov/learn/backgrounders/activ…
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