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GeoSat Mission:
The U.S. Navy Geosat radar altimeter satellite delivered data from April 1985 to September 1989 covering the earth's surface
between +/- 72 deg latitude.
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SeaSat Mission:
The Seasat spacecraft was launched in late June 1978, and during its brief 110-day lifetime, collected 90 days of nearly continuous
radar altimeter data between the latitudes of 72 deg S and 72 deg N.
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GFO Mission:
The Navy's Geosat Follow-On (GFO) satellite was launched on February 1998 with the aim of continuing ocean observation started
by the highly successfull Geosat mission.
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ERS-1 Mission:
The European Space Agency's ERS-1 radar altimeter satellite was launched in July of 1991 and provided data from August 1991 to
July 1996 in an orbit that extended coverage over the ice sheets to +/- 81.5 degrees.
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ERS-2 Mission:
The European Space Agency's ERS-2 Radar Altimeter Satellite was launched in April of 1995 in an orbit that extended coverage over
the ice sheets to +/- 81.5 degrees. In April 2005, the mission reached its 10-year operation.
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Envisat Mission:
The European Space Agency's Envisat satellite was launched into orbit on March 2002, with the aim of continuing data measurements
of the ERS (ESA) Remote Sensing Satellites. Envisat is still in operations.
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Cryosat Mission:
The European Space Agency developed the CryoSat mission. It will be a three-year radar altimetry mission, scheduled for launch on 15
September 2005, with the objective of determining variations in the thickness of the Earth's continental ice sheets and marice ice cover.
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