A Brief History of Satellite Remote Sensing. From Sputnik to Google Earth. Sputnik . Sputnik I Launched by the Soviet Union on October 4, 1957 Worlds first man-made satellite Size of a beach ball; Weighed about 184 pounds Sputnik II launched November 3, 1957
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From Sputnik to Google Earth
“This anticipated decline of Landsat 5 provides confirmation of the importance of the timely launch of the next Landsat mission and the need for an operational and reliable National Land Imaging System,” stated Anne Castle, Assistant Secretary for Water and Science at the U.S. Department of the Interior.”
Non-radar image of Sahara desert (sand) showing path to be examined with radar
Radar swath showing subsurface channels