1. a U.S. scientific satellite that studies and photographs the earth’s surface by using remote-sensing techniques.

  1. Any of various satellites used to gather data for images of the Earth’s land surface and coastal regions. These satellites are equipped with sensors that respond to Earth-reflected sunlight and infrared radiation. The first Landsat satellite was launched in 1972. Currently, the seventh satellite (Landsat 7) is orbiting Earth.

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